subject:(Diluted)

1. Subramanian M. Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;.

Degree: Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/26486

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Diluted magnetic semiconductors DMS are referred as semimagnetic semiconductors with lattice partly substituted by magnetic atoms In order to develop new electronics it is essential… (more)

Subjects/Keywords: Diluted magnetic semiconductors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

M, S. (2014). Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26486

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

M, Subramanian. “Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;.” 2014. Thesis, Anna University. Accessed March 02, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/26486.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

M, Subramanian. “Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;.” 2014. Web. 02 Mar 2021.

Vancouver:

M S. Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Mar 02]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26486.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

M S. Investigations on pure and doped tio2 And zno thin films and the effect of Swift heavy ion irradiation on Mn doped zno thin films;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26486

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University

2. Umamaheswari R. Theoretical investigation of sp half Metals in heusler structure;.

Degree: Theoretical investigation of sp half Metals in heusler structure, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/39748

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The study of spintronics materials such as diluted magnetic newlinesemiconductor DMS s multiferroic and half metallic HM alloys is one of newlinethe most attractive fields… (more)

Subjects/Keywords: Diluted magnetic semiconductor; zinc blende

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APA (6^th Edition):

R, U. (2015). Theoretical investigation of sp half Metals in heusler structure;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/39748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

R, Umamaheswari. “Theoretical investigation of sp half Metals in heusler structure;.” 2015. Thesis, Anna University. Accessed March 02, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/39748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

R, Umamaheswari. “Theoretical investigation of sp half Metals in heusler structure;.” 2015. Web. 02 Mar 2021.

Vancouver:

R U. Theoretical investigation of sp half Metals in heusler structure;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Mar 02]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39748.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

R U. Theoretical investigation of sp half Metals in heusler structure;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/39748

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manitoba

3. Black, Tyler Andrew. The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment.

Degree: Environment and Geography, 2019, University of Manitoba

URL: http://hdl.handle.net/1993/34475

► To bring bitumen from Canada's Oil Sands to market requires transportation over sensitive boreal environments via rail, truck, and pipeline. With proposed expansion of pipeline… (more)

Subjects/Keywords: oil; invertebrates; diluted bitumen; freshwater

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APA (6^th Edition):

Black, T. A. (2019). The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/34475

Chicago Manual of Style (16^th Edition):

Black, Tyler Andrew. “The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment.” 2019. Masters Thesis, University of Manitoba. Accessed March 02, 2021. http://hdl.handle.net/1993/34475.

MLA Handbook (7^th Edition):

Black, Tyler Andrew. “The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment.” 2019. Web. 02 Mar 2021.

Vancouver:

Black TA. The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment. [Internet] [Masters thesis]. University of Manitoba; 2019. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1993/34475.

Council of Science Editors:

Black TA. The effects of a simulated spill of diluted bitumen on invertebrates in a boreal lake environment. [Masters Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/34475

University of New South Wales

4. Tseng, Li-Ting. Nanostructured diluted magnetic semiconductors.

Degree: Materials Science & Engineering, 2016, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/56964 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42159/SOURCE02?view=true

► Spintronic device is one of the multifunctional devices that utilises the features of electron spin rather than charge and has the potential to increase the… (more)

▼ Spintronic device is one of the multifunctional devices that utilises the features of electron spin rather than charge and has the potential to increase the processing speed and also lower the power consumption. Hence, manipulating the spin state of electron has become an important issue. Diluted magnetic semiconductor (DMS) is a promising material to integrate both semiconducting and magnetic properties into spintronics. It is generally fabricated by doping magnetic element into semiconductor host. Wide gap semiconductors such as ZnO and TiO2 have attracted much attention due to the possibility of high Curie temperatures.Most of research works on TiO2 based DMS have been focusing on thin films and nanoparticles. In one part of this dissertation, TiO2 nanorods were synthesised using a molten salt method. The growth mechanism of nanorods and the effects of doping transition metal elements (Co, Ni, Mn and Fe) and rare earth element (Sm) on magnetic properties were investigated in detail. It was found that the morphologies were highly related to the solubility of dopant, hence affected by the amount of dopant added to the TiO2. The excess amount of dopants tends to prohibit the growth of TiO2 nanorods, resulting in the formation of nanoparticles. X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS) analysis shows the effective incorporation of transition metal ions and Sm ions. Magnetic measurement reveals that all the samples show weak room temperature ferromagnetism. However, the incorporation of dopants weakens the ferromagnetic ordering in TiO2 nanorods and leads to paramagnetic signal. The origin of ferromagnetism may come from intrinsic defects in TiO2 nanorods. Further investigation from XPS and electron spin resonance (ESR) confirms that Ti vacancy is most likely to be the origin of ferromagnetism in our samples. These results suggest that doping in TiO2 nanorods synthesised by the molten salt method may lack of carriers that could mediate ferromagnetic ordering, but leading to paramagnetism.The other part of this dissertation focuses on alkaline-element-doped α-MnO2 nanotubes synthesised by a hydrothermal method. The doping of K, Li or Na in α-MnO2 nanotubes all show ferromagnetic-like behaviour, which is attributed to the filling of K ions in the tunnels and the charge transfer of Mn ions. When the doping concentration of K is higher than 12%, it leads to the lattice distortion and antiferromagnetic coupling. Advisors/Committee Members: Yi, Jiabao, Materials Science & Engineering, Faculty of Science, UNSW, Li, Sean, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: Oxides; Diluted Magnetic Semiconductors; Nanorods

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APA (6^th Edition):

Tseng, L. (2016). Nanostructured diluted magnetic semiconductors. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/56964 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42159/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Tseng, Li-Ting. “Nanostructured diluted magnetic semiconductors.” 2016. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021. http://handle.unsw.edu.au/1959.4/56964 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42159/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Tseng, Li-Ting. “Nanostructured diluted magnetic semiconductors.” 2016. Web. 02 Mar 2021.

Vancouver:

Tseng L. Nanostructured diluted magnetic semiconductors. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Mar 02]. Available from: http://handle.unsw.edu.au/1959.4/56964 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42159/SOURCE02?view=true.

Council of Science Editors:

Tseng L. Nanostructured diluted magnetic semiconductors. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/56964 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42159/SOURCE02?view=true

Univerzitet u Beogradu

5. Paunović, Novica M. 1974-. Magnetizam u oksidnim nanomaterijalima.

Degree: Fizički fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:10179/bdef:Content/get

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Fizika /Physics Fizika kondenzovanog stanja materije / Condensed matter physics Datum odbrane: 4.7.2013.

U ovoj disertaciji je proučavan fenomen feromagnetnog uređenja na sobnoj temperaturi u… (more)

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Fizika /Physics Fizika kondenzovanog stanja materije / Condensed matter physics Datum odbrane: 4.7.2013.

U ovoj disertaciji je proučavan fenomen feromagnetnog uređenja na sobnoj temperaturi u nanokristalnim uzorcima CeO2 dopiranog gvožđem i prazeodimijumom. Razređeni magnetni oksidi, tj. oksidi dopirani malim procentom magnetnih elemenata, a koji pokazuju feromagnetno uređenje na sobnoj temperaturi, u poslednjoj deceniji predstavljaju jednu od najaktuelnijih oblasti istraživanja u fizici čvrstog stanja. Ovi materijali su viđeni kao veoma pogodni materijali za upotrebu u spintronici. S druge strane, istraživanja su takođe stimulisana činjenicom da je fenomen feromagnetizma u ovim materijalima po mnogo čemu atipičan i u velikoj meri preispituje dosadašnje poznavanje magnetizma. Posebno je interesantna činjenica da se feromagnetizam u ovim materijalima javlja samo kada su oni u nano-fazi, tj. kod uzoraka u obliku tankih slojeva ili nanočestica, dok se u voluminoznim uzrocima ne javlja. Takođe, istraživanja pokazuju da je poreklo feromagnetnog uređenja povezano sa izraženim prisustvom defekata i kiseoničnih vakancija u nanouzorcima. Mogući mehanizmi uspostavljanja feromagnetnog uređenja u ovim materijalima se i dalje istražuju, pri čemu model vezanog magnetnog polarona ili mehanizam transfera naelektrisanja u ovom trenutku deluju kao najizgledniji kandidati. U disertaciji su proučavani uzorci čistog i CeO2 dopiranog gvožđem različitih valenci Fe2+/Fe3+: 2 0.88 0.12 2- Ce Fe O d + , 2 3 0.88 0.06 0.06 2- Ce Fe Fe O d + + , 3 0.88 0.12 2- Ce Fe O d + , kao i CeO2 dopiranog prazeodimijumom, Ce1-xPrxO2-d sa sadržajem 0≤x≤0.4. Uzorci su dobijeni metodom samopropagirajuće sinteze na sobnoj temperaturi. Dobijeni nanokristalni uzorci pokazuju postojanje feromagnetnog uređenja na sobnoj temperaturi. Za ispitivanje i karakterizaciju uzoraka su korišćena magnetna merenja, Ramanova, infracrvena, XPS i Mesbauereova spektroskopija, AFM merenja i fotoluminescencija. U slučaju Fe2+/Fe3+ dopiranih CeO2 nanokristala, magnetnim merenjima je dobijeno da uzorci pokazuju osobine superparamagnetizma. Krive magnetizacije u funkciji magnetnog polja na sobnoj temperaturi pokazuju vrlo malo koercitivno polje i mogu se fitovati otežinjenom Lanževenovom funkcijom. Na osnovu merenja ZFC i FC krivih i zavisnosti koercitivnog polja sa temperaturom je dobijeno da je temperatura blokiranja oko 20 K. Raman merenja su pokazala da F2g mod na 457 cm-1 pokazuje neočekivano omekšavanje i asimetrično širenje pri Fe dopiranju i porastu valence od Fe2+ ka Fe3+, što se može objasniti efektom sprezanja elektrona i molekulskih vibracija. Ponašanje Ramanovog F2g moda ukazuje da dolazi do delimične delokalizacije Ce 4f 1 i Fe 3d elektrona, i njihovog transfera na Ce(Fe)-O(VO)-Ce(Fe) veze, dovodeći do promene konstante sile i rezultujući u omekšavanju i širenju Ramanovog moda. Korišćenjem Alenove formule, određena je konstanta elektron-fonon sprezanja za nedopirane i Fe-dopirane uzorke, kao i gustina stanja na Fermijevom nivou. Na osnovu dobijene vrednosti gustine…

Advisors/Committee Members: Popović, Zoran V. 1952-.

Subjects/Keywords: magnetism; ferromagnetism; diluted magnetic oxides; diluted magnetic semiconductors; cerium oxide

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APA (6^th Edition):

Paunović, N. M. 1. (2016). Magnetizam u oksidnim nanomaterijalima. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:10179/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Paunović, Novica M 1974-. “Magnetizam u oksidnim nanomaterijalima.” 2016. Thesis, Univerzitet u Beogradu. Accessed March 02, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:10179/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Paunović, Novica M 1974-. “Magnetizam u oksidnim nanomaterijalima.” 2016. Web. 02 Mar 2021.

Vancouver:

Paunović NM1. Magnetizam u oksidnim nanomaterijalima. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Mar 02]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:10179/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Paunović NM1. Magnetizam u oksidnim nanomaterijalima. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:10179/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

6. Chiang, Wei-Yang. Optical properties of GaMnN films grown by PA-MBE.

Degree: Master, Physics, 2011, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809111-152543

► We have grown Ga1-xMnxN films on c-sapphire substrate by plasma-assisted MBE with different Mn fluxes. The films are characterized by scanning electron microscopy (SEM), energy… (more)

Subjects/Keywords: GaMnN; Absorption; Raman; Diluted Magnetic Semiconductor; Luminescence

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APA (6^th Edition):

Chiang, W. (2011). Optical properties of GaMnN films grown by PA-MBE. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809111-152543

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chiang, Wei-Yang. “Optical properties of GaMnN films grown by PA-MBE.” 2011. Thesis, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809111-152543.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chiang, Wei-Yang. “Optical properties of GaMnN films grown by PA-MBE.” 2011. Web. 02 Mar 2021.

Vancouver:

Chiang W. Optical properties of GaMnN films grown by PA-MBE. [Internet] [Thesis]. NSYSU; 2011. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809111-152543.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chiang W. Optical properties of GaMnN films grown by PA-MBE. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809111-152543

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

7. Ding, Xiang. Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors.

Degree: Materials Science & Engineering, 2019, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/63749 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:60865/SOURCE02?view=true

► Over the past decades, the world has witnessed the rapid development of semiconductor industry according to Moore's law. However, the pace of advancement has slowed… (more)

▼ Over the past decades, the world has witnessed the rapid development of semiconductor industry according to Moore's law. However, the pace of advancement has slowed in recent years and is already nearing its end due to the limits of miniaturization. The industry is in urgent need for new materials and device designs, for example, spintronics. Spintronics is a multifunctional device that utilizes spin degrees of freedom of electrons. The key issue in spintronics is the manipulation of spins. Diluted magnetic semiconductors are able to combine both semiconducting and magnetic properties into spintronics. Room-temperature ferromagnetism is expected in transition metal oxides like TiO2 and transition metal dichalcogenides such as MoS2 and WS2, which are the subjects of this dissertation.In the first part of this dissertation, 5 at% Co-doped TiO2 thin films were grown on LaAlO3 and SrTiO3 substrates by pulsed laser deposition. The growth mechanism and magnetic properties of the thin films were investigated in detail. It was found that although only anatase phase was observed in X-ray diffraction, the epitaxial films can be either fully strained or fully relaxed based on the choice of substrates. The Co dopants tend to segregate near the interface, but the size and distribution of the nanoclusters depend on the deposition parameters. Higher temperatures and slow growth rate lead to bigger cluster size and greater distance to the interface. The magnetic moments can reach 3.5 μB/Co at room temperature, supported by the first-principles calculations consideringspin-orbit coupling. Polarised neutron reflectometry measurement reveals that Co clusters and possible surrounding defects are the main magnetic sources. The second part of this dissertation focuses on defect engineering in WS2 and MoS2. Both WS2 annealed in reducing gas and Nd-doped MoS2 show enhanced room-temperature ferromagnetism. The magnetic properties of the annealed WS2 powders are governed by the sulfur vacancies, which significantly increase in density with increased annealing temperature. In the Nd-doped MoS2 crystals, the exchange coupling of Nd3+ ions and sulfur vacancies introduced by ion implantation can form magnetic polarons that determine the magnetic properties. Advisors/Committee Members: Wu, Tao, Materials Science & Engineering, Faculty of Science, UNSW, Yi, Jiabao, Materials Science & Engineering, Faculty of Science, UNSW, Hart, Judith, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: Defect engineering; Spintronics; Diluted magnetic semiconductor

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APA (6^th Edition):

Ding, X. (2019). Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/63749 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:60865/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Ding, Xiang. “Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors.” 2019. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021. http://handle.unsw.edu.au/1959.4/63749 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:60865/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Ding, Xiang. “Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors.” 2019. Web. 02 Mar 2021.

Vancouver:

Ding X. Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Mar 02]. Available from: http://handle.unsw.edu.au/1959.4/63749 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:60865/SOURCE02?view=true.

Council of Science Editors:

Ding X. Ferromagnetism in oxide and dichalcogenide based diluted magnetic semiconductors. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/63749 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:60865/SOURCE02?view=true

University of Notre Dame

8. Xiang Li. Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>.

Degree: Physics, 2017, University of Notre Dame

URL: https://curate.nd.edu/show/rb68x923k2z

► Ferromagnetic properties are investigated in GaMnAs and GaMnAsP diluted magnetic semiconductors by multiple experimental techniques, including magnetometry, magnetotransport, and ferromagnetic resonance (FMR), with emphasis… (more)

▼ Ferromagnetic properties are investigated in GaMnAs and GaMnAsP diluted magnetic semiconductors by multiple experimental techniques, including magnetometry, magnetotransport, and ferromagnetic resonance (FMR), with emphasis on magnetic anisotropy and its manipulation by nano-patterning, strain, and interfacial exchange between layers of dissimilar materials. Studies of temperature dependence of ac magnetic susceptibility in GaMnAs films revealed a single peak along the [1-10] crystallographic direction occurring close to the Curie temperature, which is attributed to paramagnetic-to-ferromagnetic phase transition; and another single peak occurring at lower temperatures and seen along [100] direction, which signals the onset of biaxial domain structure in GaMnAs induced by the competition between uniaxial and cubic anisotropy. In lithographically-patterned GaMnAs nanostructures this intrinsic magneto-crystalline anisotropy was observed to compete with shape-induced magnetic anisotropy that occurs in such nanostructures due to their geometry. Interestingly, the effects due to nanostructure shape can be remarkably reduced by low-temperature annealing of the nanostructures, which thus provides an approach for controlling magnetic anisotropy on the nano-scale. A series of thin films of the quaternary alloy GaMnAsP with various phosphorus concentrations (up to 30%) was also fabricated and investigated in detail. X-ray diffraction and reciprocal space mapping confirmed that the strain in GaMnAsP films grown on GaAs (100) substrates undergoes a transition from compressive to tensile as P concentration increases in GaMnAs. This was followed by magnetometry and magnetotransport measurements, which clearly show that as the tensile strain increases, the easy axis in the GaMnAsP films shifts from the in-plane [100] orientation to the out-of-plane [001] direction. These experiments also revealed a dropping trend in T_C and steady increase of sheet resistivity as with increasing mole fraction of P. For completeness, anomalous Hall effect and anisotropic magnetoresistance were also observed in the GaMnAsP, attesting to its excellent ferromagnetic characteristics. A further study on GaMnAsP/GaMnAs bilayer nanostructures revealed an entirely new interfacial exchange interaction between the two magnetic layers, that occurs as a result of orthogonal easy axis orientations in the two alloys. This interfacial coupling revealed itself as a horizontal shift of the hysteresis loops of the GaMnAs layer in weak-field-cooled magnetization measurements, thus representing a novel form of exchange bias. Under favorable conditions, this effect holds promise of applications in magnetic memory devices. Finally, the same lithographic patterning techniques used for GaMnAs nanostructures were adopted to fabricate GaMnAsP nano-squares. Experimental results unambiguously show that perpendicular magnetic anisotropy is strongly affected by the size of the ferromagnetic nano-scale elements, while their in-plane… Advisors/Committee Members: Jacek Furdyna, Research Director, Malgorzata Dobrowolska, Research Director.

Subjects/Keywords: magnetic anisotropy; GaMnAsP; diluted magnetic semiconductor

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APA (6^th Edition):

Li, X. (2017). Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/rb68x923k2z

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Xiang. “Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>.” 2017. Thesis, University of Notre Dame. Accessed March 02, 2021. https://curate.nd.edu/show/rb68x923k2z.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Xiang. “Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>.” 2017. Web. 02 Mar 2021.

Vancouver:

Li X. Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>. [Internet] [Thesis]. University of Notre Dame; 2017. [cited 2021 Mar 02]. Available from: https://curate.nd.edu/show/rb68x923k2z.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li X. Investigation and Manipulation of Ferromagnetic Properties of GaMnAs and GaMnAsP Nanostructures</h1>. [Thesis]. University of Notre Dame; 2017. Available from: https://curate.nd.edu/show/rb68x923k2z

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

9. Piao, Jingyuan. Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method.

Degree: Materials Science & Engineering, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/55770 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39185/SOURCE02?view=true

► Spin-based devices are the next generation devices to replace current semiconductor devices. For realizing the functions of spin-based devices, new materials have to be developed.… (more)

▼ Spin-based devices are the next generation devices to replace current semiconductor devices. For realizing the functions of spin-based devices, new materials have to be developed. Diluted magnetic semiconductor (DMS) is one of the promising materials for spintronics devices, especially DMS based on oxide semiconductor such as ZnO after the predication by Dietl and his colleagues. After the prediction, many researches on the ZnO based diluted magnetic semiconductors have been performed. Room temperature ferromagnetism has been widely reported. However, the mechanism is not clear. Secondary phases and magnetic clusters have been claimed to be the origin of ferromagnetism. For example, Co doped ZnO films only show room temperature ferromagnetism when it is prepared under an oxygen poor environment, which makes it possible to produce magnetic Co clusters. Therefore, intrinsic ferromagnetism is doubtful. However, it is widely accepted that Co doped ZnO quantum dot has intrinsic ferromagnetism. Hence, the ferromagnetism in nanostructured diluted magnetic semiconductor is of interest. In this thesis, two methods CVD and hydrothermal approaches have been used for the fabrication of ZnO based nanorods doped with magnetic element and nonmagnetic element. For CVD method, Eu and Co are codoped into ZnO. It shows that Co doped ZnO alone easily induces Co magnetic clusters, which is confirmed by XRD analysis. However, if a certain amount of Eu is codoped into ZnO, the Co doping can be stabilized. For the hydrothermal method, Na, K and Sm have been used as dopant to incorporate with ZnO nanorods. It is know that N and K are not magnetic element. However, by delicate control of fabrication parameters, room temperature ferromagnetism has been observed. The ferromagnetism is due to the formation of Zn vacancies by Na or K doping. It is known that Sm is one of the rare earth elements, which possesses 4f orbital having large spin-orbital coupling. Experimental results indicate that a small amount of Sm doping in ZnO can induce room temperature ferromagnetism. High doping concentration can greatly decrease the magnetic moment, which may be due to the formation of antiferromagnetic coupling for high doping concentration. Advisors/Committee Members: Yi, Jiabao, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: Spintronics; ZnO; Diluted magnetic semiconductors; Doping

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APA (6^th Edition):

Piao, J. (2015). Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55770 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39185/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Piao, Jingyuan. “Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method.” 2015. Masters Thesis, University of New South Wales. Accessed March 02, 2021. http://handle.unsw.edu.au/1959.4/55770 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39185/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Piao, Jingyuan. “Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method.” 2015. Web. 02 Mar 2021.

Vancouver:

Piao J. Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method. [Internet] [Masters thesis]. University of New South Wales; 2015. [cited 2021 Mar 02]. Available from: http://handle.unsw.edu.au/1959.4/55770 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39185/SOURCE02?view=true.

Council of Science Editors:

Piao J. Characterization and properties of cobalt and europium co-doped ZnO nanostructures fabricated by CVD and K，Na , Sm doped ZnO nanostructures fabricated by hydrothermal method. [Masters Thesis]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/55770 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39185/SOURCE02?view=true

NSYSU

10. Kao, Hsiang-shun. Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy.

Degree: Master, Physics, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712113-031646

► Plasma-assisted molecular beam epitaxy (PAMBE) synthesized diluted magnetic semiconductors nanorods on n-type Si (111) substrates are investigated in this report. Mn atoms are doped into… (more)

Subjects/Keywords: GaN; Diluted Magnetic Semiconductors; Mn:GaN; Molecular Beam Epitaxy; Nanorods

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APA (6^th Edition):

Kao, H. (2013). Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712113-031646

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kao, Hsiang-shun. “Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy.” 2013. Thesis, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712113-031646.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kao, Hsiang-shun. “Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy.” 2013. Web. 02 Mar 2021.

Vancouver:

Kao H. Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712113-031646.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kao H. Growth and Characterization of Mn Delta-Doped III-Nitrides Nanorods Fabricated by Plasma-Assisted Molecular Beam Epitaxy. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0712113-031646

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

11. Chao-Cin, Yang. The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor.

Degree: Master, Physics, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-124910

► One of the most interested topic in ZnO series diluted magnetic semiconductor is the role of oxygen vacancies. It has been shown that the oxygen… (more)

▼ One of the most interested topic in ZnO series diluted magnetic semiconductor is the role of oxygen vacancies. It has been shown that the oxygen vacancies and interstitial hydrogen ions can be generated when introduced hydrogen gas during the film growth depending on the growth temperature. The main goals of this study are to understand the effect of the added hydrogen during the growth of pure ZnO and Zn0.95Co0.05O films on the generation of oxygen vacancies and the effect of oxygen vacancies on magnetic coupling. Two series of films, ZnO and Zn0.95Co0.05O (CZO) films, were grown by a standard RF sputtering technique. N&K optical measurement indicates the optical transmittance is lower by increasing the percentage of H2 in the growth atmosphere, which is denoted as H2%. Because the total growth pressure may control the mean free path of sputtered particles and indirectly affects filmsâ thickness which affects the quality of crystal grains. It is found that the crystal quality is better for films grown at 50mTorr rather than that at 130mTorr. The oxygen vacancy may introduce shallow donor band that enhances the electric conductivity, the film grown at 50mTorr has a higher electric conductivity than that at 130mTorr, as well. One important result of present study is that the doping of Co in ZnO films may enhance hydrogen effect and generates more oxygen vacancies in CZO films when were grown at the same growth condition as the pure ZnO films. Therefore, CZO films shows strong optical scattering lowing the optical transmittance. MCD measurements manifest obvious deep curves around 34eV which indicate that both series of films exhibit magnetic coupling under an applied filed, in which, CZO has stronger magnetic strength. However, the MCD is linearly dependent on the external magnetic field indicating a paramagnetic coupling. No room temperature ferromagnetic are observed. One important result is that the existence of magnetic coupling in pure ZnO film indicates that oxygen vacancies may trap electrons and preserved certain magnetic moment. Advisors/Committee Members: Hsiung Chou (committee member), Chun-Yu Hsu (chair), Shih-Jye Sun (chair).

Subjects/Keywords: Co-doped ZnO; ZnO; Wurtzite; Magnetic Circular Dichroism; Diluted magnetic semiconducror

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APA (6^th Edition):

Chao-Cin, Y. (2013). The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-124910

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chao-Cin, Yang. “The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor.” 2013. Thesis, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-124910.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chao-Cin, Yang. “The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor.” 2013. Web. 02 Mar 2021.

Vancouver:

Chao-Cin Y. The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-124910.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chao-Cin Y. The Study on Oxygen Vacancies on the ZnO Diluted Magnetic Semiconductor. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0812113-124910

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

12. Lin, Yuan-Ting. Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods.

Degree: PhD, Physics, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0618114-171135

► Plasma-assisted molecular beam epitaxy growth and characteristics of GaMnN diluted magnetic semiconductors, including epitaxial thin films and one-dimensional nanorods, are investigated in this dissertation. Both… (more)

▼ Plasma-assisted molecular beam epitaxy growth and characteristics of GaMnN diluted magnetic semiconductors, including epitaxial thin films and one-dimensional nanorods, are investigated in this dissertation. Both homogeneously doped and delta-doped techniques are adopted to grow GaMnN thin films. Mn homogeneously doped high crystal quality GaN thin films were grown on c-sapphire with low-temperature GaN buffer layer. Mn atoms successfully substitute the Ga sites in wurtzite structure. GaMnN thin film exhibits 5.5% negative magnetoresistance (MR) at 10 K. The MR drastically drops above 50 K. The temperature dependence magnetization measured by superconducting quantum interference device (SQUID) is about 50 K Curie temperature of GaMnN. Furthermore, the crystallinity of delta-doped GaMnN thin film is verified by high-resolution x-ray diffraction (HRXRD) and transmission electron microscopy (TEM). The zero-field-cool (ZFC) and field-cool (FC) curves and anomalous Hall Effect (AHE) indicate the Curie temperature of the thin film sample is 190-200 K. The GaMnN nanorods are also grown by PAMBE with homogeneously and delta-doping techniques. The Raman scattering and SQUID measurements indicate the interstitial or nano-sized clusters of Mn may form in homogeneously doped nanorods. Excessive Mn atoms form an amorphous layer between nanorods and substrate. The growth period of delta-doped nanorods is studied for minimizing the formation of Mn related secondary phases and thereby enhancing the crystal quality of the nanorods. Above room temperature ferromagnetism of GaMnN nanorods is observed in the delta-doped nanorods. The anisotropic magnetism of nanorods shows that preferred direction for the magnetic moment alignment is not along the c-axis of GaMnN. The saturated magnetization of delta-doped GaMnN with 1.8% Mn content, obtained by increasing Mn flux during growth, is enhanced almost four times larger than homogeneously doped sample. Advisors/Committee Members: Tsung-Wei Chen (chair), Chuan-Pu Liu (chair), Quark Chen (chair), Li-Wei Tu (committee member), Den -Jun Jang (chair).

Subjects/Keywords: Molecular Beam Epitaxy; GaMnN; Nanorods; Diluted Magnetic Semiconductors

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APA (6^th Edition):

Lin, Y. (2014). Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0618114-171135

Chicago Manual of Style (16^th Edition):

Lin, Yuan-Ting. “Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods.” 2014. Doctoral Dissertation, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0618114-171135.

MLA Handbook (7^th Edition):

Lin, Yuan-Ting. “Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods.” 2014. Web. 02 Mar 2021.

Vancouver:

Lin Y. Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods. [Internet] [Doctoral dissertation]. NSYSU; 2014. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0618114-171135.

Council of Science Editors:

Lin Y. Growth and Characterization of Diluted Magnetic Semiconductors GaMnN Thin Films and Nanorods. [Doctoral Dissertation]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0618114-171135

13. Raebiger, Hannes. Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N.

Degree: 2006, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2006/isbn9512281228/

►

(Ga,Mn)As and (Ga,Mn)N are so called diluted magnetic semiconductors, i.e. semiconductor based materials made ferromagnetic by inclusion of a magnetic element—in this case Mn. This… (more)

▼

(Ga,Mn)As and (Ga,Mn)N are so called diluted magnetic semiconductors, i.e. semiconductor based materials made ferromagnetic by inclusion of a magnetic element—in this case Mn. This type of materials bridge over the incompatibilities in metal–semiconductor interfaces in electronics components and have an enormous potential for future spintronics applications, where both charge and spin degrees of freedom can be employed simultaneously. In order to design new—or employ the existing—diluted magnetic semiconductor materials, the underlying mechanisms of magnetism must be understood. In this work a theoretical study of the structural and magnetic properties of the two most important prototype materials, (Ga,Mn)As and (Ga,Mn)N, is presented. Ferromagnetism arises from the quantum mechanical exchange interactions, but is by its very nature a macroscopic ordering effect. Therefore a multiscale approach is employed, beginning from quantum mechanical interactions. Both microscopic configurational energies and corresponding magnetic interactions are calculated from first principles. These energies are used in Monte Carlo simulations to study macroscopic and finite temperature properties. Curie temperatures are estimated using the Weiss molecular field theory, as well as a more sophisticated Monte Carlo approach. We show that both (Ga,Mn)As and (Ga,Mn)N consist largely of Mn clusters, and that the electronic and magnetic properties of these clusters differ significantly from those of single substitutional impurities. For (Ga,Mn)As we also show using lattice kinetic Monte Carlo methods that clustering occurs during growth and annealing via the Ga monovacancy mediated diffusion. For both materials clustering efficiently reduces the Curie temperatures even though the underlying band structure trends are different. The Curie temperatures are estimated for (Ga,Mn)As using the Weiss molecular field theory, while for (Ga,Mn)N we employ Monte Carlo methods in order to obtain the Curie temperatures.

Dissertation / Laboratory of Physics, Helsinki University of Technology, ISSN 1455-1802; 139

Advisors/Committee Members: Helsinki University of Technology, Department of Engineering Physics and Mathematics, Laboratory of Physics.

Subjects/Keywords: diluted magnetic semiconductors; clustering; Curie temperature; density-functional calculation

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APA (6^th Edition):

Raebiger, H. (2006). Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2006/isbn9512281228/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Raebiger, Hannes. “Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N.” 2006. Thesis, Helsinki University of Technology. Accessed March 02, 2021. http://lib.tkk.fi/Diss/2006/isbn9512281228/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Raebiger, Hannes. “Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N.” 2006. Web. 02 Mar 2021.

Vancouver:

Raebiger H. Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N. [Internet] [Thesis]. Helsinki University of Technology; 2006. [cited 2021 Mar 02]. Available from: http://lib.tkk.fi/Diss/2006/isbn9512281228/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Raebiger H. Ferromagnetism in (Ga,Mn)As and (Ga,Mn)N. [Thesis]. Helsinki University of Technology; 2006. Available from: http://lib.tkk.fi/Diss/2006/isbn9512281228/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

14. CHAO, TSE-HSUN. The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films.

Degree: Master, Physics, 2017, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714117-171633

► Ga1-xMnxN has been considered to be one of the candidates for diluted magnetic semiconductors (DMS). In this thesis, we study the properties of epitaxial Ga1-xMnxN… (more)

Subjects/Keywords: GaMnN; GaN; transition element; inclusions; diluted magnetic semiconductors

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APA (6^th Edition):

CHAO, T. (2017). The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714117-171633

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

CHAO, TSE-HSUN. “The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films.” 2017. Thesis, NSYSU. Accessed March 02, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714117-171633.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

CHAO, TSE-HSUN. “The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films.” 2017. Web. 02 Mar 2021.

Vancouver:

CHAO T. The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films. [Internet] [Thesis]. NSYSU; 2017. [cited 2021 Mar 02]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714117-171633.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

CHAO T. The magnetic and spectroscopic properties of nonpolar m-plane GaN:Mn thin films. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0714117-171633

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

15. Andre, Kalissa Lauren. Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16357

► One-dimensional nanoscale semiconductors combined with the extra degree of freedom provided by electron spin show great promise for use in novel spintronic devices. Diluted magnetic… (more)

▼ One-dimensional nanoscale semiconductors combined with the extra degree of freedom provided by electron spin show great promise for use in novel spintronic devices. Diluted magnetic semiconductor and topological insulator nanowires and nanoribbons manipulate the inherent spin of electrons, introducing new and interesting properties to the material, but the synthesis of these materials must be studied before they can be reliably produced. This study reports on the successful vapor-liquid-solid growth of Bi2Se3 nanowires and nanoribbons through thermal evaporation. The growth parameters were adjusted to increase the nanostructure yield during growth and preliminary transmission electron microscopy (TEM) characterization was performed. The Bi2Se3 nanowires and nanoribbons were found to have a wide range of diameters and widths, from 150 nm to 750 nm. The nanostructures did not have a common growth direction, but some of the structure studied had a growth direction in the (0001) plane. A growth direction in the (0001) plane is desired for thermoelectric and topological insulator applications as the electrical conductivity and thermoelectric fi�gure of merit for Bi2Se3 is highest parallel to the (0001) planes. Zn1-xMnxSe nanowires and nanoribbons grown through thermal evaporation were characterized using TEM. Both straight and tapered nanowires were found. The straight nanowires varied in Mn fraction, with 0.1 < x < 0.28, but were consistent within individual nanowires. The tapered nanowires increased in Mn fraction within individual nanowires, from a high Mn fraction at the wider base of the wire to a low Mn fraction at the thinner tip of the wire. The tapering and systematic change in Mn fraction along the wire was attributed to a Mn-rich thin �film deposition during nanowire growth. Superdi�raction spots in the nanoribbons were attributed to atomic ordering of Mn on the Zn sublattice. It was determined that the atomic ordering only occurred when there was a Mn fraction of x > 0.1. Nanoribbons without atomic ordering were found for Mn fractions of 0.05 < x < 0.2. This thesis is the �first time atomic ordering has been reported in nanoribbons. Advisors/Committee Members: Suzanne E Mohney, Thesis Advisor/Co-Advisor.

Subjects/Keywords: nanowire; thermal evaporation; diluted magnetic semiconductor; topological insulator; Bi2Se3; ZnMnSe; ordering

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APA (6^th Edition):

Andre, K. L. (2012). Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16357

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Andre, Kalissa Lauren. “Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons.” 2012. Thesis, Penn State University. Accessed March 02, 2021. https://submit-etda.libraries.psu.edu/catalog/16357.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Andre, Kalissa Lauren. “Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons.” 2012. Web. 02 Mar 2021.

Vancouver:

Andre KL. Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Mar 02]. Available from: https://submit-etda.libraries.psu.edu/catalog/16357.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Andre KL. Synthesis and Characterization of Zn1-xmnxse and Bi2se3 Nanowires and Nanoribbons. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16357

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

16. Lei, Ying. Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study .

Degree: Civil Engineering, 2016, Queens University

URL: http://hdl.handle.net/1974/15231

► Adverse environmental effects caused by diluted bitumen (dilbit) spills have led to serious public concern. Compared to marine systems, the cleanup of oil-contaminated sediment in… (more)

▼ Adverse environmental effects caused by diluted bitumen (dilbit) spills have led to serious public concern. Compared to marine systems, the cleanup of oil-contaminated sediment in rivers is more difficult. Hyporheic flow, where surface water flows through the streambed, is one of the contributing factors for sediment contamination, which has received little research attention. Therefore, a series of laboratory experiments were conducted in this study: to quantify the mass of dilbit droplets that get trapped in the sediment in gravel-dominated rivers by hyporheic flow; to investigate the effects of velocity, gravel size and clean water wash on the interaction between dilbit droplets and gravel porous media; and to determine the predominant droplet retention mechanism. Dilbit droplets were generated in a mixing reactor and transported through a one-dimensional gravel-packed aluminum column. Gravel sizes of 3 mm and 8 mm, and flow velocities of 0.09 cm/s and 0.35 cm/s were investigated to identify the impacts of these influential parameters on the trapping of dilbit droplets in gravel. Clean water wash after the completion of droplet transport was also applied to some experiments to examine whether droplet trapping is reversible. In addition, mathematical models that included attachment and straining filtration mechanisms used in colloid transport were employed to fit the experimental data. Results showed that trapped dilbit droplets in gravel follows a hyperexponential (not log-linear) profile. Smaller gravel size (3 mm) or higher flow velocity (0.35 cm/s) led to a greater mass of dilbit retained in the gravel-packed column, especially near the pack inlet. Clean water wash was shown to remove part of the trapped dilbit droplets, especially near the gravel pack inlet. A filtration model that considered straining instead of attachment was able to better match the observations, which indicates that straining is more likely to be the primary mechanism for the trapping of dilbit droplets in gravel.

Subjects/Keywords: Trapping ; Gravel Sediment ; Hyporheic Flow ; Diluted Bitumen ; Oil Droplets

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APA (6^th Edition):

Lei, Y. (2016). Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/15231

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lei, Ying. “Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study .” 2016. Thesis, Queens University. Accessed March 02, 2021. http://hdl.handle.net/1974/15231.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lei, Ying. “Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study .” 2016. Web. 02 Mar 2021.

Vancouver:

Lei Y. Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study . [Internet] [Thesis]. Queens University; 2016. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1974/15231.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lei Y. Quantification of Trapped Diluted Bitumen Droplets in Gravel: an Experimental Study . [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/15231

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Notre Dame

17. Jonathan Carl Leiner. Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>.

Degree: Physics, 2012, University of Notre Dame

URL: https://curate.nd.edu/show/b2773t9684b

► The study of ferromagnetic semiconductors (FMS) continues to be of great interest because of their potential for spintronic devices. While there has been much… (more)

▼ The study of ferromagnetic semiconductors (FMS) continues to be of great interest because of their potential for spintronic devices. While there has been much progress in our understanding of FMS materials – particularly of the canonical III-V system GaMnAs – many issues still remain unresolved. One of these is the nature of interlayer exchange coupling (IEC) in GaMnAs-based multilayers, an issue that is important from the point of view of possible spintronic applications. In this connection, it is important to establish under what conditions the IEC between successive GaMnAs layers is antiferromagnetic (AFM) or ferromagnetic (FM), since manipulation of such IEC can then be directly applied to achieve giant magnetoresistance (GMR) and other devices based on this material. In this thesis I describe magneto-transport, magnetization, and neutron reflectometry experiments applied to GaMnAs-based tri-layer structures, consisting of GaMnAs layers separated by non-magnetic GaAs spacers. These measurements serve to identify conditions under which AFM coupling will occur in such GaMnAs/GaAs multilayer systems, thus providing us the information which can be used for manipulating magnetization (and thus GMR) in structures based on the ferromagnetic semiconductor GaMnAs. In addition, I describe results regarding vertically graded magnetic anisotropy in GaMnAs. Controlled vertical grading of magnetization of the ferromagnetic semiconductor GaMnAs represents a significant step toward optimizing its magnetic properties for device applications. We show that vertical magnetization gradients in GaMnAs layers can readily be achieved by appropriate growth strategies, although quantitative control of such grading is difficult in the growth of such layers due to various competing effects, such as Mn diffusion, self-annealing, and diffusion of charge carriers. Furthermore, there also are several surface effects that can influence the magnetization profile, which should be considered in designing and fabricating graded GaMnAs specimens. Polarized neutron reflectometry provides direct evidence that vertical grading of Mn concentration has been successfully achieved in our GaMnAs samples, and that the samples exhibit magnetic “hardening" near the surface. Finally, I describe results from efforts to carefully engineer the hole concentration in GaMnAs both after and during growth. When Ge is grown on GaMnAs, the incorporation of Mn has already been fixed during its growth, but the holes are drained off into Ge. SQUID measurements show Tc in GaMnAs drops rapidly when layers of Ge are deposited over it, the decrease in Tc scaling roughly with the thickness of the Ge layers. Based on our current understanding of impurity band behavior in GaMnAs, this precision control over hole concentration may be important for efforts to optimize Tc. In addition, I describe efforts (and their unintended consequences on magnetic anisotropy) to control the incorporation of Mn in substitutional and interstitial positions of GaAs via increasing the… Advisors/Committee Members: Sylwia Ptasinska, Committee Member, Boldizsar Janko, Committee Member, Margaret Dobrowolska, Committee Member, Philippe Collon, Committee Member.

Subjects/Keywords: Magnetism; GaMnAs; Neutron Reflectometry; magneto-transport; Diluted Magnetic Semiconductors; SQUID; Semiconductors

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APA (6^th Edition):

Leiner, J. C. (2012). Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/b2773t9684b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Leiner, Jonathan Carl. “Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>.” 2012. Thesis, University of Notre Dame. Accessed March 02, 2021. https://curate.nd.edu/show/b2773t9684b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Leiner, Jonathan Carl. “Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>.” 2012. Web. 02 Mar 2021.

Vancouver:

Leiner JC. Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>. [Internet] [Thesis]. University of Notre Dame; 2012. [cited 2021 Mar 02]. Available from: https://curate.nd.edu/show/b2773t9684b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Leiner JC. Exchange Coupling in the Ferromagnetic Semiconductor GaMnAs</h1>. [Thesis]. University of Notre Dame; 2012. Available from: https://curate.nd.edu/show/b2773t9684b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Missouri – Columbia

18. Mishra, Subodha. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.

Degree: PhD, 2006, University of Missouri – Columbia

URL: https://doi.org/10.32469/10355/4413

► This thesis is a theoretical study of photo-induced ferro-magnetism in dilute magnetic semiconductors. When light is incident on these systems, electrons and holes are created… (more)

▼ This thesis is a theoretical study of photo-induced ferro-magnetism in dilute magnetic semiconductors. When light is incident on these systems, electrons and holes are created across the band gap. These particles interact with the impurity magnetic moments and mediate ferro-magnetism when temperature is lowered. This is a situation similar to the famous Rabi problem of a two state system coupled to time-dependent oscillating electric field. Ours is a multi-state system with electrons and holes coupled to an oscillating electric field. This is a generalization of the Rabi problem which shows also a phase transition from para to ferromagnetic state. We first study some model one and two state systems. We show by performing appropriate unitary transformations, it is possible to eliminate the time from the time-dependent Hamiltonians and get the eigen energies. Since our system of electrons and holes in contact with the photon bath is in a steady state, we calculate the free energy of the system. We study the problem of phase transition in two different ways, one by constructing Bogoliubov-Valatin quasi particles and the other by BCS wave function approach as in the low-temperature superconducting phenomenon. This also establishes that BCS and BV approaches are equivalent mean-led methods. We calculate magnetization of the system in a self-consistent mean-field way. The magnetization and thereby the critical temperature is dependent on the photon energy incident on the system. By increasing the light coupling to the particles the transition temperature increases. Also by increasing the frequency of the light, the transition temperature is increased. Since more and more of the electrons and holes are created, these carriers mediate more with the magnetic moments and flip their moments into the ferro-magnetic state. It is also found that even when light energy is below the band-gap there is still magnetization and a ferro-magnetic state is still possible. It is interesting to find a linear dependence of critical temperature Tc on the coupling J². Advisors/Committee Members: Satpathy, Sashi Sekhar, 1956- (advisor).

Subjects/Keywords: Ferromagnetism; Diluted magnetic semiconductors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mishra, S. (2006). Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. (Doctoral Dissertation). University of Missouri – Columbia. Retrieved from https://doi.org/10.32469/10355/4413

Chicago Manual of Style (16^th Edition):

Mishra, Subodha. “Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.” 2006. Doctoral Dissertation, University of Missouri – Columbia. Accessed March 02, 2021. https://doi.org/10.32469/10355/4413.

MLA Handbook (7^th Edition):

Mishra, Subodha. “Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.” 2006. Web. 02 Mar 2021.

Vancouver:

Mishra S. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. [Internet] [Doctoral dissertation]. University of Missouri – Columbia; 2006. [cited 2021 Mar 02]. Available from: https://doi.org/10.32469/10355/4413.

Council of Science Editors:

Mishra S. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. [Doctoral Dissertation]. University of Missouri – Columbia; 2006. Available from: https://doi.org/10.32469/10355/4413

University of Missouri – Columbia

19. Mishra, Subodha. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.

Degree: PhD, 2006, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/4413

► This thesis is a theoretical study of photo-induced ferro-magnetism in dilute magnetic semiconductors. When light is incident on these systems, electrons and holes are created… (more)

▼ This thesis is a theoretical study of photo-induced ferro-magnetism in dilute magnetic semiconductors. When light is incident on these systems, electrons and holes are created across the band gap. These particles interact with the impurity magnetic moments and mediate ferro-magnetism when temperature is lowered. This is a situation similar to the famous Rabi problem of a two state system coupled to time-dependent oscillating electric field. Ours is a multi-state system with electrons and holes coupled to an oscillating electric field. This is a generalization of the Rabi problem which shows also a phase transition from para to ferromagnetic state. We first study some model one and two state systems. We show by performing appropriate unitary transformations, it is possible to eliminate the time from the time-dependent Hamiltonians and get the eigen energies. Since our system of electrons and holes in contact with the photon bath is in a steady state, we calculate the free energy of the system. We study the problem of phase transition in two different ways, one by constructing Bogoliubov-Valatin quasi particles and the other by BCS wave function approach as in the low-temperature superconducting phenomenon. This also establishes that BCS and BV approaches are equivalent mean-led methods. We calculate magnetization of the system in a self-consistent mean-field way. The magnetization and thereby the critical temperature is dependent on the photon energy incident on the system. By increasing the light coupling to the particles the transition temperature increases. Also by increasing the frequency of the light, the transition temperature is increased. Since more and more of the electrons and holes are created, these carriers mediate more with the magnetic moments and flip their moments into the ferro-magnetic state. It is also found that even when light energy is below the band-gap there is still magnetization and a ferro-magnetic state is still possible. It is interesting to find a linear dependence of critical temperature Tc on the coupling J². Advisors/Committee Members: Satpathy, Sashi Sekhar, 1956- (advisor).

Subjects/Keywords: Ferromagnetism; Diluted magnetic semiconductors

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mishra, S. (2006). Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. (Doctoral Dissertation). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/4413

Chicago Manual of Style (16^th Edition):

Mishra, Subodha. “Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.” 2006. Doctoral Dissertation, University of Missouri – Columbia. Accessed March 02, 2021. http://hdl.handle.net/10355/4413.

MLA Handbook (7^th Edition):

Mishra, Subodha. “Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors.” 2006. Web. 02 Mar 2021.

Vancouver:

Mishra S. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. [Internet] [Doctoral dissertation]. University of Missouri – Columbia; 2006. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10355/4413.

Council of Science Editors:

Mishra S. Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors. [Doctoral Dissertation]. University of Missouri – Columbia; 2006. Available from: http://hdl.handle.net/10355/4413

University of New South Wales

20. Luo, Xi. The development of advanced magnetic semiconductors.

Degree: Materials Science & Engineering, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/54953 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36246/SOURCE02?view=true

► A spintronics device is a new paradigm of a multifunctional device, which allows the interplay of charge carriers and spin in a single system. Compared… (more)

▼ A spintronics device is a new paradigm of a multifunctional device, which allows the interplay of charge carriers and spin in a single system. Compared to conventional microelectronics, spintronics devices have several prominent features, such as non-volatility, fast data processing speed, low power consumption and high integration density. However, the integration of spintronics within the current semiconductor industry has to date been unsuccessful due to the low spin injection from metal to semiconductor. To achieve spin manipulation in semiconductor devices, a new category of materials with both ferromagnetic and semiconductive properties needs to be developed.Diluted magnetic semiconductor (DMS) is a class of materials in which a fraction of the cations in a non-magnetic semiconductor matrix are substitutionally replaced by magnetic ions. The exchange interaction between the spin of the magnetic dopant and the itinerant carriers results in a collective ferromagnetic ordering. Currently, ZnO and TiO2 are two of the most promising host materials for a DMS for the purpose of room temperature ferromagnetism. In this dissertation, the microstructure and magnetic property of ZnO-based and TiO2-based DMSs will be discussed.The structure and magnetic properties of Mn-doped and Nd-doped nanoparticles has been investigated in detail. Results indicate that both crystallinity and ferromagnetic ordering of Mn-doped and Nd-doped nanoparticles are decreased with an increase in doping concentration. A high Nd doping level even leads to antiferromagnetic coupling in a ZnO matrix. Additionally, post-annealing in air or argon can largely improve the crystallinity of Mn doped-ZnO, but eliminate ferromagnetic ordering, due probably to the removal of oxygen vacancy or the precipitation of Mn dopants. Oxygen partial pressure also has a significant influence on the microstructure and magnetic property of Co-doped TiO2 films. The films prepared at a low oxygen partial pressure show a homogeneous microstructure with fully magnetic volume, indicating intrinsic ferromagnetism. High oxygen partial pressure leads to the formation of phase segregation and a significantly low magnetic volume fraction. First principle calculations indicate that the origin of ferromagnetism is Co substitution of Ti and the formation of n type carriers enhances the formation of uniform microstructure and intrinsic room temperature ferromagnetism. Advisors/Committee Members: Yi, Jiabao, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: ZnO; Diluted magnetic semiconductor; Room-temperature ferromagnetism; TiO2

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Luo, X. (2015). The development of advanced magnetic semiconductors. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54953 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36246/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Luo, Xi. “The development of advanced magnetic semiconductors.” 2015. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021. http://handle.unsw.edu.au/1959.4/54953 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36246/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Luo, Xi. “The development of advanced magnetic semiconductors.” 2015. Web. 02 Mar 2021.

Vancouver:

Luo X. The development of advanced magnetic semiconductors. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Mar 02]. Available from: http://handle.unsw.edu.au/1959.4/54953 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36246/SOURCE02?view=true.

Council of Science Editors:

Luo X. The development of advanced magnetic semiconductors. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54953 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36246/SOURCE02?view=true

University of Cincinnati

21. Deshpande, Ruta S. Biodegradability of Diluted Bitumen (Dilbit).

Degree: MS, Engineering and Applied Science: Environmental Engineering, 2016, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757897

► The share of unconventional fuel sources (oil sands, shale gas etc.) in the oil market is growing in terms of production and usage. For the… (more)

▼ The share of unconventional fuel sources (oil sands, shale gas etc.) in the oil market is growing in terms of production and usage. For the past 40 years, the United States has been importing petroleum products derived from Canadian oil sands. Nevertheless, in recent times, owing to the increased demand, the proposal of pipeline expansions along with two major spills (Kalamazoo, 2010 and Mayflower, 2013), these sources are again in the limelight. Oil sands yield bitumen which is the heaviest form of crude oil. For transportation purposes, bitumen is altered either by diluting or upgrading. When bitumen is blended with lighter hydrocarbons, diluted bitumen or dilbit is produced. Its physical and chemical properties are quite different from those of conventional oils. Limited and inconsistent literature is available on the biodegradability of dilbit, thus the main aim of this research was to evaluate different aspects of its biodegradation to fill this knowledge gap. To achieve this goal various bench scale experiments were run in two phases. In phase one, two tests were carried out at 5 and 25 ºC in freshwater media with two types of dilbits, western Canadian select (WCS) and Cold Lake Blend (CLB). Cultures isolated from sediments obtained after the dredging operations on Kalamazoo River spill were enriched and used as the inoculum. The physical and chemical characteristics of WCS and CLB differed slightly, whereas their composition was significantly different from that of a conventional crude oil. The degradation rates obtained for both dilbits as well as the extent of their removal were comparable, with faster rates for the higher temperature.Phase two was a comparative study to assess biodegradation of dilbit and a conventional crude oil under several conditions. For this purpose, WCS dilbit and Prudhoe Bay Crude (PBC) were tested. Additionally, microbial consortia obtained from two different hydrocarbon contaminated sites were used to evaluate the effect of microbial enrichments. Prior to the experimental set up, cultures obtained from Kalamazoo River (KMZ) where enriched on dilbit at 5 (cryo) and 25 (meso) ºC, while culture isolated from Ohio River (AF) was enriched at only 25 ºC. Although observed rates of alkane, polycyclic aromatic hydrocarbon (PAH), and total extractable hydrocarbon (TEH) removal were similar for dilbit and conventional crude oil, the latter degraded to greater extent. All three consortia showed diverse microbial community structure which greatly influenced degradation potential with varying temperature. Although complete alkane removal was achieved in all the treatments, the metabolism of PAH and TEH varied. The KMZ meso culture was the most efficient consortium as it metabolized most of the PAHs along with the biomarker hopane. The AF culture exhibited distinct behavior at the two temperatures with a longer assimilation time at the colder temperature, which was not the case at the warmer temperature. Advisors/Committee Members: Campo, Pablo (Committee Chair).

Subjects/Keywords: Environmental Engineering; Oil sands; diluted bitumen; dilbit; biodegradation; Unconventional oil

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Deshpande, R. S. (2016). Biodegradability of Diluted Bitumen (Dilbit). (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757897

Chicago Manual of Style (16^th Edition):

Deshpande, Ruta S. “Biodegradability of Diluted Bitumen (Dilbit).” 2016. Masters Thesis, University of Cincinnati. Accessed March 02, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757897.

MLA Handbook (7^th Edition):

Deshpande, Ruta S. “Biodegradability of Diluted Bitumen (Dilbit).” 2016. Web. 02 Mar 2021.

Vancouver:

Deshpande RS. Biodegradability of Diluted Bitumen (Dilbit). [Internet] [Masters thesis]. University of Cincinnati; 2016. [cited 2021 Mar 02]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757897.

Council of Science Editors:

Deshpande RS. Biodegradability of Diluted Bitumen (Dilbit). [Masters Thesis]. University of Cincinnati; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470757897

Technical University of Lisbon

22. Bandeira, Filipa de Sousa. Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax.

Degree: 2012, Technical University of Lisbon

URL: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5302

►

Mestrado em Engenharia Alimentar - Processamento de Alimentos - Instituto Superior de Agronomia

Arundo donax L. is a Mediterranean energy crop with a high potential… (more)

Subjects/Keywords: Arundo donax L.; diluted acid hydrolysis; particle size; microbial acclimatization; Debaryomyces hansenii; xylitol

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bandeira, F. d. S. (2012). Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax. (Thesis). Technical University of Lisbon. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bandeira, Filipa de Sousa. “Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax.” 2012. Thesis, Technical University of Lisbon. Accessed March 02, 2021. http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bandeira, Filipa de Sousa. “Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax.” 2012. Web. 02 Mar 2021.

Vancouver:

Bandeira FdS. Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax. [Internet] [Thesis]. Technical University of Lisbon; 2012. [cited 2021 Mar 02]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5302.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bandeira FdS. Otimização da produção de xilitol por estirpes de Debaryomyces hansenii em hidrolisado de Arundo donax. [Thesis]. Technical University of Lisbon; 2012. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5302

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

23. Lamouroux, Jean. Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach.

Degree: Docteur es, Energétique, 2013, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2013ECAP0028

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Cette thèse se situe dans le cadre du projet CANOE, piloté par GDF SUEZ et l'ADEME, qui vise à étudier la faisabilité et la viabilité… (more)

▼

Cette thèse se situe dans le cadre du projet CANOE, piloté par GDF SUEZ et l'ADEME, qui vise à étudier la faisabilité et la viabilité du régime de combustion sans flamme dans les chaudières industrielles. Il est maintenant établi que le préchauffage des réactifs permet d'améliorer le rendement thermique et de diminuer la consommation de combustible d'une configuration. Pour contourner la formation d'oxydes d'azote résultant de l'augmentation de température des réactifs, ces derniers peuvent être massivement dilués par des produits de combustion. Cela permet d'éviter la formation de points chauds et d'homogénéiser les gradients de température: c'est le principe de la combustion sans flamme. L'objectif de cette thèse est de développer un modèle de combustion turbulente adapté à ce type de régime. La cinétique chimique complexe et le contrôle des pertes thermiques est d'une importance capitale dans l'établissement et la stabilisation du processus de combustion sans flamme. Ici, ces effets sont considérés dans une approche de tabulation de la cinétique chimique de type FPV. Pour discriminer les effets associés aux évolutions suivant les paramètres de contrôle de nos bases de données, on effectue une analyse des réponses de flammes laminaires à différents niveaux de dilution et de pertes thermiques. De plus, nous évaluons l'importance de l'utilisation de tabulations de dimensions élevées, et les capacités prédictives des méthodes de tabulation développées sont mises en exergue. Puis, des simulations aux grandes échelles de la turbulence de configurations adiabatique et à parois refroidies sont effectuées. On compare des tabulations de nombre de degrés de libertés variés aux données expérimentales. Les résultats obtenus sont en très bon accord avec ces dernières pour les tabulations les plus complexes, alors que des limitations significatives apparaissent pour des tabulations de dimensions inférieures. Les simulations proposées indiquent la capacité de nos modèles à reproduire des structures de flammes réalistes.

This thesis is within a framework of the CANOE project, under the responsibility of GDF SUEZ and the ADEME, and aims at studying the feasibility of the flameless combustion regime in industrial boilers. It is now well established that reactants preheating allows an improvement on thermal efficiency as well as fuel savings. To avoid an increase in nitrogen oxides emissions arising from reactants temperature augmentation, massive dilution of the reactants by burnt gases can be used. While doing so, hot spots are averted and temperature gradients are smoothed: it’s the principle of flameless combustion. Even though this combustion regime is a subject of increasing interest to the industry, its mechanisms are not yet fully understood. The objective of this work is to develop and validate a new turbulent combustion model adapted to this kind of regimes. Complex chemistry as well as heat losses control is of paramount importance in the establishment and stabilization of the flameless combustion process. Here, these…

Advisors/Committee Members: Gicquel, Olivier (thesis director).

Subjects/Keywords: Combustion diluée; Chimie tabulée; Simulations aux Grandes Echelles; Diluted combustion; Chemistry tabulation; Large Eddy Simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lamouroux, J. (2013). Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2013ECAP0028

Chicago Manual of Style (16^th Edition):

Lamouroux, Jean. “Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach.” 2013. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed March 02, 2021. http://www.theses.fr/2013ECAP0028.

MLA Handbook (7^th Edition):

Lamouroux, Jean. “Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach.” 2013. Web. 02 Mar 2021.

Vancouver:

Lamouroux J. Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2013ECAP0028.

Council of Science Editors:

Lamouroux J. Modélidation de la combustion diluée par tabulation de la cinétique chimique : Diluted combustion modeling by chemistry tabulation approach. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. Available from: http://www.theses.fr/2013ECAP0028

24. Luiz Figueira Pinto. Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos.

Degree: 2007, Universidade Federal Rural do Rio de Janeiro

URL: http://bdtd.ufrrj.br//tde_busca/arquivo.php?codArquivo=625

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A Palicourea marcgravii (Pm), a planta tóxica mais importante no Brasil, é responsável por cerca da metade das mortes por intoxicação natural em bovinos no… (more)

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A Palicourea marcgravii (Pm), a planta tóxica mais importante no Brasil, é responsável por cerca da metade das mortes por intoxicação natural em bovinos no País. A intoxicação cursa com evolução superaguda e morte súbita, atribuída ao ácido monofluoroacético, substância de alta toxidez para diversos mamíferos, inclusive o homem. A terapêutica homeopática emprega soluções ultradiluídas e dinamizadas e há evidências suficientes para explorá-la como possível proteção contra intoxicações. Os objetivos deste trabalho foram comparar os efeitos tóxicos dos extratos aquoso (EA) e hidro-alcoólico (tintura-mãe - TM) de Pm em ratos e avaliar o efeito das soluções ultradiluídas e dinamizadas (Pm 6CH e Pm 30CH) sobre a tolerância e ação tóxica da planta e avaliar a ocorrência de alterações clínicas, necroscópicas e histopatológicas em ratos não-intoxicados tratados com essas soluções. O EA, a TM, a Pm 6CH e a Pm 30CH foram administrados a 49 ratos distribuídos em seis grupos-teste; dois grupos adicionais foram mantidos como controle. Os grupos EA e TM foram constituídos por 10 animais cada, que receberam doses que variaram de 0,4g/kg, 0,8g/kg, 2g/kg e 4g/kg. Os grupos UD6EA e UD30EA foram constituídos por cinco ratos cada e receberam 1mL das soluções Pm 6CH e Pm 30CH, respectivamente, por via oral, três vezes ao dia, e após oito dias 2g/kg do extrato aquoso de Pm, por via intragástrica. Os grupos UD6 e UD30, constituídos por cinco ratos cada, receberam 1mL de Pm 6CH e Pm 30CH, respectivamente, por via oral, três vezes ao dia, durante 63 dias. Os animais foram avaliados por parâmetros clínicos, comportamentais (campo aberto e labirinto em cruz elevado), achados de necropsia e exames histopatológicos. Ocorreu morte superaguda com as doses de 0,4g/kg, 0,8g/kg, 2g/kg e 4g/kg. No grupo EA observaram-se prostração e hiperexcitabilidade nervosa, seguida, ou não, por crise convulsiva e no grupo TM depressão nervosa acentuada, sem convulsão. Havia ainda pêlos eriçados, dispnéia, cianose de extremidades, e hipotermia. À necropsia observaram-se fígado congesto e dilatação cardíaca e pelo exame histopatológico, degeneração hidrópicovacuolar em túbulos contornados distais dos rins e congestão em vários órgãos. Houve diferenças nas latências para o aparecimento dos primeiros sinais clínicos, de convulsão e ocorrência de morte entres os grupos UD30EA, UD6EA e EA1 (Pm 2g/kg), mas o numero de animais foi considerado pequeno para se atribuir efeito protetor das soluções ultradiluídas e dinamizadas à intoxicação pela planta. Os grupos UD6 e UD30 não apresentaram diferenças clínicas, comportamentais ou necroscópicas em comparação com o grupo controle. Conclui-se que o extrato aquoso produz excitabilidade nervosa e convulsão e a tintura-mãe depressão nervosa, que há efeito acumulativo e que as soluções ultradiluídas e dinamizadas não induziram aumento ponderal da tolerância aos efeitos tóxicos da Pm e não produziram alterações no estado de saúde dos animais sadios.

Palicourea marcgravii (Pm) is the most important toxic plant in Brazil. It is…

Advisors/Committee Members: Paulo Fernando de Vargas Peixoto, Ticiana do Nascimento França, Marilene de Farias Brito.

Subjects/Keywords: Palicourea marcgravii; ultradiluídos; ácido monofluoroacético.; MEDICINA VETERINARIA; ultra-highly diluted; monofluoroacetic acid.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pinto, L. F. (2007). Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos. (Thesis). Universidade Federal Rural do Rio de Janeiro. Retrieved from http://bdtd.ufrrj.br//tde_busca/arquivo.php?codArquivo=625

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pinto, Luiz Figueira. “Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos.” 2007. Thesis, Universidade Federal Rural do Rio de Janeiro. Accessed March 02, 2021. http://bdtd.ufrrj.br//tde_busca/arquivo.php?codArquivo=625.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pinto, Luiz Figueira. “Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos.” 2007. Web. 02 Mar 2021.

Vancouver:

Pinto LF. Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos. [Internet] [Thesis]. Universidade Federal Rural do Rio de Janeiro; 2007. [cited 2021 Mar 02]. Available from: http://bdtd.ufrrj.br//tde_busca/arquivo.php?codArquivo=625.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pinto LF. Efeitos dos extratos aquoso e hidro-alcoólico e das soluções ultradiluídas de Palicourea marcgravii (Rubiaceae) em ratos. [Thesis]. Universidade Federal Rural do Rio de Janeiro; 2007. Available from: http://bdtd.ufrrj.br//tde_busca/arquivo.php?codArquivo=625

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Marin, Ivan Silvestre Paganini. Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas.

Degree: Mestrado, Física Aplicada, 2007, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21082008-111614/ ;

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Neste trabalho e apresentado um estudo, via teoria de massa efetiva multibanda autoconsistente de heteroestruturas de semicondutores magnéticos diluídos, generalizada para incluir parâmetros de diferentes… (more)

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Neste trabalho e apresentado um estudo, via teoria de massa efetiva multibanda autoconsistente de heteroestruturas de semicondutores magnéticos diluídos, generalizada para incluir parâmetros de diferentes materiais. A interacao magnética e descrita por um modelo de campo médio baseado no mecanismo de troca indireta, com a possibilidade de inclusão de diferentes íons magnéticos. As equacoes de massa efetiva são resolvidas de forma autoconsistente com o auxílio da equacao de Poisson. As interacoes de spin-órbita e de troca-correlacao, na aproximacao de densidade local, são incluídas no cálculo. O método e aplicado para o estudo das estruturas de bandas e densidades de carga com separacao por spin do portador de heteroestruturas com dopagem tipo-n e tipo-p, variando a geometria dos pocos magnéticos e também o período da super-rede, as densidades de portadores e as concentracoes de íons magnéticos. Solucoes autoconsistentes da equacao de massa efetiva são encontradas para o oxido semicondutor (Zn,Co)O. Será mostrada a separacao de portadores por spin em funcao dos parâmetros variados, simulando diversas concentracoes possíveis, utilizadas em sistemas descritos na literatura, e será analisado o comportamento dos perfis de potencial. Usando os dados obtidos, um diagrama de fases será traçado com base na polarizacao total ou parcial dos portadores, e o seu comportamento será discutido. Também serão mostradas as estruturas de bandas, os perfis de potencial e as distribuicoes de carga do semicondutor (GaMn)As, variando as densidades de portadores e a direcao do campo magnético intrínseco, gerado pela dopagem com íons magnéticos. Os resultados obtidos neste trabalho podem servir de guia para futuras experiências e para o desenvolvimento de dispositivos com semicondutores magnéticos diluídos baseados em (Zn,Co)O e (Ga,Mn)As. Os métodos aqui descritos são gerais e podem ser utilizados para outros materiais.

This work presents a self-consistent multiband effective mass theory applied to diluted magnetic semiconductor heterostructures, generalized to include parameters of different ma- terials. The magnetic interaction is described by a mean-field approximation based on indirect- exchange mecanism, with the possibility of inclusion of different magnetic ions. The effective mass equations are solved self-consistently with the help of the Poisson equation. Spin-orbit and exchange-correlation interactions are included in the simulation in the local density appro- ximation. The method is used to study band structures and charge densities separated by spin in n- and p-type heterostructures. The magnetic well\'s geometry, the superlattice period, the carrier density and the magnetic ion concentration are changed. Self-consistent solutions of the effective mass equation are found for the semiconductor oxide (Zn,Co)O. Charge separation by spin will be show in function of the variation of the simulation parameters, simulating several ion concentrations and charge densities used in systems described in literature, and the potenti- als…

Advisors/Committee Members: Sipahi, Guilherme Matos.

Subjects/Keywords: Computacional simulation; Diluted magnetic semiconductors; Heteroestruturas; Heterostructures; Semicondutores magnéticos diluídos; Simulação computacional; Spintrônica.; Spintronics.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marin, I. S. P. (2007). Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21082008-111614/ ;

Chicago Manual of Style (16^th Edition):

Marin, Ivan Silvestre Paganini. “Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas.” 2007. Masters Thesis, University of São Paulo. Accessed March 02, 2021. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21082008-111614/ ;.

MLA Handbook (7^th Edition):

Marin, Ivan Silvestre Paganini. “Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas.” 2007. Web. 02 Mar 2021.

Vancouver:

Marin ISP. Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas. [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2021 Mar 02]. Available from: http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21082008-111614/ ;.

Council of Science Editors:

Marin ISP. Propriedades eletrônicas de heteroestruturas semicondutoras magnéticas diluídas. [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/76/76132/tde-21082008-111614/ ;

Université Montpellier II

26. Barate, Philippe. Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well.

Degree: Docteur es, Milieux denses et matériaux, 2010, Université Montpellier II

URL: http://www.theses.fr/2010MON20160

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Ce manuscrit présente une étude sur les ondes de spin de vecteur d'onde nul par le moyen de la rotation Kerr résolue en temps. Les… (more)

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Ce manuscrit présente une étude sur les ondes de spin de vecteur d'onde nul par le moyen de la rotation Kerr résolue en temps. Les ondes de spin sont générées dans un puits quantique CdMnTe dopé n, ce qui introduit de la complexité dans le système. Le résultat principal de cette étude est l'apparition d'un anticroisement de mode d'excitation du gaz d'électron appelé onde de spin et du mode d'excitation des spins localisés sur les sites des ions magnétiques. Cet effet est provoqué par le couplage des deux systèmes de spin par l'interaction d'échange. On accède alors à la mesure de la polarisation du gaz bidimensionnel d'électrons qui ce compare très bien à la théorie tenant compte de l'augmentation de la polarisation par les effets à N-corps. Une partie de ce manuscrit est consacré à la mise en place expérimentale de la rotation Kerr résolue en temps. On étudie ensuite l'onde de spin pour les champs magnétiques hors résonance. On montre que le temps de relaxation de l'onde n'est pas encore complètement compris, même si nous décrivons un modèle de relaxation inhomogène. Puis nous étudions finalement la résonance où nous montrons que la description habituelle en champs moyen ne convient pas, et nous proposons un modèle au delà de cette approximation qui permet une mesure de la polarisation du gaz bidimensionnel d'électrons en accord avec la théorie.

This manuscript present a study of nul wave vector spin flip waves by time resolved Kerr rotation. Spin flip waves are generated in a n doped CdMnTe quantum well, increasing the complexity of the system. The main result of this study is the apparition of an anticrossing between the excitation mode of the electron gaz called spin flip wave and the excitation mode of localized spin on magnetic ions. This effect is caused by the coupling of the two spin sytem by the exchange interaction. We acces then to the gaz spin polarization which is compared to theorie explaining the enhancement of the polarization by many-body effects. A part of this manuscript is dedicated to the experimental set-up of the time resolved Kerr rotation. Next, we study the spin flip wave for magnetic field below the resonance. We show that the relaxation time of the spin wave is not well understand even if we describe a model of inhomogeneous relaxation. Finally we study the resonance and we show that the mean field description don't work and we propose a model beyond the mean field which allow a measurement of the spin polarization of electron gas in agreement with the theorie.

Advisors/Committee Members: Scalbert, Denis (thesis director).

Subjects/Keywords: Ondes de spin; Puits quantique; Semiconducteur magnétique dilué; Spin waves; Quantum wells; Diluted magnetic semiconductor

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Barate, P. (2010). Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2010MON20160

Chicago Manual of Style (16^th Edition):

Barate, Philippe. “Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well.” 2010. Doctoral Dissertation, Université Montpellier II. Accessed March 02, 2021. http://www.theses.fr/2010MON20160.

MLA Handbook (7^th Edition):

Barate, Philippe. “Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well.” 2010. Web. 02 Mar 2021.

Vancouver:

Barate P. Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well. [Internet] [Doctoral dissertation]. Université Montpellier II; 2010. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2010MON20160.

Council of Science Editors:

Barate P. Génération et détection optique d'ondes de spin dans les puits quantiques CdMnTe dopés n : Optical generation and detection of spin waves in n doped CdMnTe quantum well. [Doctoral Dissertation]. Université Montpellier II; 2010. Available from: http://www.theses.fr/2010MON20160

Université de Grenoble

27. Cao, Chong Long. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.

Degree: Docteur es, Physique, 2012, Université de Grenoble

URL: http://www.theses.fr/2011GRENY062

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Nous avons étudié la dynamique de spin d'un atome de Mn inséré dans une boite quantique CdTe. Nos résultats montrent que la relaxation de spin… (more)

▼

Nous avons étudié la dynamique de spin d'un atome de Mn inséré dans une boite quantique CdTe. Nos résultats montrent que la relaxation de spin du Mn est plus rapide lorsque la boite quantique contient un exciton. Ceci peut permettre une orientation optique du spin du Mn. Le mélange de bande de valence est le paramètre essentiel permettant la relaxation rapide du spin du Mn dans le champ d'échange de l'exciton. Ce mélange de bande de valence est controlé par la forme et les contraintes dans la boite quantique. L'influence de ces paramètres sur la dynamique du pompage optique a été analysée en détail. Nos simulations du pompage optique sont en bon accord avec les expériences. La dynamique cohérente d'un Mn individuel a aussi été étudiée. L'influence sur le pompage optique de la dynamique cohérente du spin électronique et nucléaire est discutée. Nous avons montré que le couplage entre spin électronique et nucléaire peut être contrôlé optiquement permettant une manipulation du spin du Mn. Nous avons finalement montré que la combinaison d'une excitation résonante optique et micro-onde peut être utilisée pour détecter optiquement la résonance magnétique d'un Mn dans une boite quantique CdTe.

We have studied the spin dynamics of an individual Mn atom embedded a CdTe quantum dot. Our results show that the Mn spin relaxation is faster when the quantum dot contains an exciton. This can result in an optical orientation of the Mn spin. The valence band mixing is the critical parameter for the fast relaxation rates of the Mn spin in the exchange field of the exciton. This valence band mixing is controlled by the shape and strain of the quantum dot. The influence of these parameters on the optical pumping dynamics were analyzed in detail. Our simulation of optical pumping are in good agreement with experiments. The coherent dynamics of an individual Mn spin was also investigated. We discussed the influence of the coherent dynamics of the coupled electronic and nuclear spins on the optical pumping. We have shown that optically controlled coupling between electronic and nuclear spins could be used for Mn spin switching. We finally demonstrated that the combination of resonant laser and microwave fields can be used to optically detect the magnetic resonance of a Mn spin in a CdTe quantum dot.

Advisors/Committee Members: Mariette, Henri (thesis director), Besombes, Lucien (thesis director).

Subjects/Keywords: Boite quantique; Semiconducteur magnétique dilué; Dynamique de spin; Quantum dot; Diluted magnetic semiconductor; Spin dynamics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cao, C. L. (2012). Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENY062

Chicago Manual of Style (16^th Edition):

Cao, Chong Long. “Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.” 2012. Doctoral Dissertation, Université de Grenoble. Accessed March 02, 2021. http://www.theses.fr/2011GRENY062.

MLA Handbook (7^th Edition):

Cao, Chong Long. “Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.” 2012. Web. 02 Mar 2021.

Vancouver:

Cao CL. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. [Internet] [Doctoral dissertation]. Université de Grenoble; 2012. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2011GRENY062.

Council of Science Editors:

Cao CL. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. [Doctoral Dissertation]. Université de Grenoble; 2012. Available from: http://www.theses.fr/2011GRENY062

28. Göhring, Holger. Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots.

Degree: 2017, Technische Universität Dortmund

URL: http://dx.doi.org/10.17877/DE290R-18039

► The combination of semiconductor based materials with magnetic properties in so called diluted magnetic semiconductors could revolutionize the field of spintronics. Here, the charge and… (more)

▼ The combination of semiconductor based materials with magnetic properties in so called diluted magnetic semiconductors could revolutionize the field of spintronics. Here, the charge and spin properties of such devices can be utilized for the processing and storage of data. The magnetic properties of gallium manganese arsenide (GaMnAs), which is a promising candidate for ferromagnetic ordering at room temperature, have been extensively studied over the years. Especially, the Curie temperature could be enhanced up to 250 K in special hybrid systems, since its first realization in 1996. This thesis deals with the investigation of the effect of magnetostriction on GaMnAs thin film lattices grown epitaxially on a GaAs substrate. The magnetostriction occurs during the magnetization process of the GaMnAs sample induced by the second-order phase transition occurring at the Curie temperature. The effect of magnetostriction was studied for two samples with Curie temperatures of 50 K and 110K on a temperature range from 30 K to 180 K. For this purpose, a continuous flow cryostat setup for high-resolution x-ray diffraction was constructed and developed at BL9 at DELTA. Here, measurements reveal changes in the GaMnAs lattice constant with a resolution on an order of magnitude of 10 -4 Å. The obtained results are analyzed in two independent approaches, investigating the angular separation of the positions of the GaAs and GaMnAs (004) Bragg reflections and the modelling of the measured crystal truncation rods. The discussion of both obtained results leads consistently to a relative change in lattice constant on the order of (2.8 ± 1.1) ∙10 -4 Å. Within a second project the thermal expansion of GaAs and (In,Ga)As/GaAs quantum dots were also investigated with the constructed high-resolution x-ray diffraction setup. It was found that the differences in thermal expansion of these samples are small compared to the effect of thermal heating. Therefore, it is highly unlikely, that the observed tetragonal lattice distortion of the quantum dot sample can be assigned to a sole thermal effect. It is further discussed, that this distortion is induced by the polaron formation due to the optical excitement of the carriers. Advisors/Committee Members: Tolan, Metin (advisor), Bayer, Manfred (referee).

Subjects/Keywords: Magnetostriction; Diluted magnetic semiconductors; High-resolution x-ray diffraction; 530; Magnetischer Halbleiter; Röntgenbeugung; Magnetostriktion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Göhring, H. (2017). Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots. (Doctoral Dissertation). Technische Universität Dortmund. Retrieved from http://dx.doi.org/10.17877/DE290R-18039

Chicago Manual of Style (16^th Edition):

Göhring, Holger. “Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots.” 2017. Doctoral Dissertation, Technische Universität Dortmund. Accessed March 02, 2021. http://dx.doi.org/10.17877/DE290R-18039.

MLA Handbook (7^th Edition):

Göhring, Holger. “Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots.” 2017. Web. 02 Mar 2021.

Vancouver:

Göhring H. Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots. [Internet] [Doctoral dissertation]. Technische Universität Dortmund; 2017. [cited 2021 Mar 02]. Available from: http://dx.doi.org/10.17877/DE290R-18039.

Council of Science Editors:

Göhring H. Structural investigation of the impact of magnetostriction on GaMnAs thin film lattices and the thermal expansion of (In,Ga)As/GaAs quantum dots. [Doctoral Dissertation]. Technische Universität Dortmund; 2017. Available from: http://dx.doi.org/10.17877/DE290R-18039

Université de Grenoble

29. Cao, Chong Long. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.

Degree: Docteur es, Physique, 2012, Université de Grenoble

URL: http://www.theses.fr/2012GRENY119

►

Nous avons étudié la dynamique de spin d'un atome de Mn inséré dans une boite quantique CdTe. Nos résultats montrent que la relaxation de spin… (more)

▼

Nous avons étudié la dynamique de spin d'un atome de Mn inséré dans une boite quantique CdTe. Nos résultats montrent que la relaxation de spin du Mn est plus rapide lorsque la boite quantique contient un exciton. Ceci peut permettre une orientation optique du spin du Mn. Le mélange de bande de valence est le paramètre essentiel permettant la relaxation rapide du spin du Mn dans le champ d'échange de l'exciton. Ce mélange de bande de valence est controlé par la forme et les contraintes dans la boite quantique. L'influence de ces paramètres sur la dynamique du pompage optique a été analysée en détail. Nos simulations du pompage optique sont en bon accord avec les expériences. La dynamique cohérente d'un Mn individuel a aussi été étudiée. L'influence sur le pompage optique de la dynamique cohérente du spin électronique et nucléaire est discutée. Nous avons montré que le couplage entre spin électronique et nucléaire peut être contrôlé optiquement permettant une manipulation du spin du Mn. Nous avons finalement montré que la combinaison d'une excitation résonante optique et micro-onde peut être utilisée pour détecter optiquement la résonance magnétique d'un Mn dans une boite quantique CdTe.

We have studied the spin dynamics of an individual Mn atom embedded a CdTe quantum dot. Our results show that the Mn spin relaxation is faster when the quantum dot contains an exciton. This can result in an optical orientation of the Mn spin. The valence band mixing is the critical parameter for the fast relaxation rates of the Mn spin in the exchange field of the exciton. This valence band mixing is controlled by the shape and strain of the quantum dot. The influence of these parameters on the optical pumping dynamics were analyzed in detail. Our simulation of optical pumping are in good agreement with experiments. The coherent dynamics of an individual Mn spin was also investigated. We discussed the influence of the coherent dynamics of the coupled electronic and nuclear spins on the optical pumping. We have shown that optically controlled coupling between electronic and nuclear spins could be used for Mn spin switching. We finally demonstrated that the combination of resonant laser and microwave fields can be used to optically detect the magnetic resonance of a Mn spin in a CdTe quantum dot.

Advisors/Committee Members: Mariette, Henri (thesis director), Besombes, Lucien (thesis director).

Subjects/Keywords: Boite quantique; Semiconducteur magnétique dilué; Dynamique de spin; Quantum dot; Diluted magnetic semiconductor; Spin dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cao, C. L. (2012). Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2012GRENY119

Chicago Manual of Style (16^th Edition):

Cao, Chong Long. “Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.” 2012. Doctoral Dissertation, Université de Grenoble. Accessed March 02, 2021. http://www.theses.fr/2012GRENY119.

MLA Handbook (7^th Edition):

Cao, Chong Long. “Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot.” 2012. Web. 02 Mar 2021.

Vancouver:

Cao CL. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. [Internet] [Doctoral dissertation]. Université de Grenoble; 2012. [cited 2021 Mar 02]. Available from: http://www.theses.fr/2012GRENY119.

Council of Science Editors:

Cao CL. Modélisation de la dynamique de spin d'un atome magnétique individuel dans une boîte quantique : Modelling of the spin dynamics of an individual magnetic atom in a quantum dot. [Doctoral Dissertation]. Université de Grenoble; 2012. Available from: http://www.theses.fr/2012GRENY119

Michigan Technological University

30. Wang, Yanyu. THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE.

Degree: PhD, Department of Mechanical Engineering-Engineering Mechanics, 2018, Michigan Technological University

URL: https://digitalcommons.mtu.edu/etdr/631

► A significant challenge facing spark-ignited (SI) engines to achieve higher efficiency via highly diluted combustion is the quickly increased combustion instability as the dilution… (more)

▼ A significant challenge facing spark-ignited (SI) engines to achieve higher efficiency via highly diluted combustion is the quickly increased combustion instability as the dilution level increases. The flow motion variation has been identified as a dominant factor that introduces combustion variability at highly diluted conditions. However, the detailed mechanism of how the variation in flow motion impacts the flame kernel development and introduces combustion instability is only partially understood. This research investigated the impacts of the in-cylinder flow on variability of the ignition and early flame kernel development in a single cylinder direct-injection spark-ignition (DI-SI) optically accessible engine and accessory test benches. Firstly, different types of spark plug electrode designs were studied on a spark plug flow fixture bench. The results showed that the impacts of incoming flow on the ignition output vary as the incoming flow direction is changed. The ignition energy drops and discharge duration prolongs as the incoming flow is blocked by any part of the electrodes. Secondly, the flow motion near the spark plug region was investigated in an optical engine through high-speed imaging of the spark discharge arc stretching and flow field measurement via particle imaging velocimetry. It was observed that at motored conditions there is a consistent trend that the flow can change direction from the bulk motion as the piston approaches the top dead center (TDC). The transition of flow direction near the spark plug is a source of variability in initial flame kernel convection and propagation. It was found that by increasing the tumble motion, the transition window can be retarded later in the cycle. Lastly, the impacts of the unstable incylinder flow motion on the flame kernel initiation and development was studied at both diluted and stoichiometric conditions. The 2D and 1D probability distribution functions of the flame kernel indicated that the reversed flow direction near the spark plug at ignition timing results in smaller and less stretched flame kernels, which are a source of combustion variability. As the tumble level is increased, the window where the transition of flow direction occurs near the spark plug also changes. This research indicates that, at the studied loads and speeds, higher tumble level helps maintain a consistent flow motion near the spark plug at the ignition timing, which results in faster growing flame kernels. Advisors/Committee Members: Jeffrey D. Naber.

Subjects/Keywords: optical engine; diluted combustion; tumble; ignition; flow; flame; Automotive Engineering; Energy Systems

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APA (6^th Edition):

Wang, Y. (2018). THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE. (Doctoral Dissertation). Michigan Technological University. Retrieved from https://digitalcommons.mtu.edu/etdr/631

Chicago Manual of Style (16^th Edition):

Wang, Yanyu. “THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE.” 2018. Doctoral Dissertation, Michigan Technological University. Accessed March 02, 2021. https://digitalcommons.mtu.edu/etdr/631.

MLA Handbook (7^th Edition):

Wang, Yanyu. “THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE.” 2018. Web. 02 Mar 2021.

Vancouver:

Wang Y. THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE. [Internet] [Doctoral dissertation]. Michigan Technological University; 2018. [cited 2021 Mar 02]. Available from: https://digitalcommons.mtu.edu/etdr/631.

Council of Science Editors:

Wang Y. THE INTERACTION OF IGNITION AND IN-CYLINDER FLOW ON FLAME KERNEL DEVELOPMENT AND ITS IMPACTS ON COMBUSTION IN AN OPTICALLY ACCESSIBLE DIRECT INJECTION ENGINE. [Doctoral Dissertation]. Michigan Technological University; 2018. Available from: https://digitalcommons.mtu.edu/etdr/631

Open Access Theses and Dissertations