subject:(Magnetic Multilayers)

Delft University of Technology

1. Van de Kruijs, R.W.E. Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers.

Degree: 2002, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372

Subjects/Keywords: magnetic multilayers; reflectometry; diffuse scattering

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APA (6^th Edition):

Van de Kruijs, R. W. E. (2002). Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372

Chicago Manual of Style (16^th Edition):

Van de Kruijs, R W E. “Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers.” 2002. Doctoral Dissertation, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372.

MLA Handbook (7^th Edition):

Van de Kruijs, R W E. “Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers.” 2002. Web. 06 Mar 2021.

Vancouver:

Van de Kruijs RWE. Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers. [Internet] [Doctoral dissertation]. Delft University of Technology; 2002. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372.

Council of Science Editors:

Van de Kruijs RWE. Specular and off-specular reflection of polarized neutrons from magnetic thin films and multilayers. [Doctoral Dissertation]. Delft University of Technology; 2002. Available from: http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; urn:NBN:nl:ui:24-uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372 ; http://resolver.tudelft.nl/uuid:57e63626-e60a-46fb-8fc4-eae73e4aa372

2. Reyes Vasquez, David Fernando. Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt.

Degree: Docteur es, Nanophysique, 2016, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2016TOU30356

► Les nanofils magnétiques suscitent un intérêt considérable depuis une quinzaine d'années en raison de leur utilisation potentielle pour la spintronique. Leur utilisation potentielle dans des… (more)

▼ Les nanofils magnétiques suscitent un intérêt considérable depuis une quinzaine d'années en raison de leur utilisation potentielle pour la spintronique. Leur utilisation potentielle dans des dispositifs exige une description détaillée des états magnétiques locaux des nanofils. Dans cette thèse, j'ai étudié qualitativement et quantitativement les états magnétiques à l'état rémanent de nanofils magnétiques par holographie électronique (EH) et simulations micromagnétiques. Une analyse détaillée a été réalisée sur deux types de nanofils : multicouches Co/Cu et nanofils FeCoCu à diamètre modulé. Les deux systèmes ont été synthétisés par électrodéposition dans des membranes. La combinaison des caractérisations magnétiques, structurales et chimiques locales obtenues dans un TEM avec des simulations micromagnétiques ont permis une description complète de ces systèmes. Pour les nanofils multicouches Co / Cu, j'ai analysé l'influence des épaisseurs de cobalt et de cuivre ou de la structure cristalline de Co sur la configuration magnétique de nanofils isolés. Après l'application d'un champs de saturation dans des directions parallèle et perpendiculaire à l'axe des nanofils, j'ai étudié les configurations magnétiques pour les épaisseurs de Co / Cu suivantes : 25nm / 15nm, 25nm / 45nm, 50nm / 50nm et 100nm / 100nm. Trois configurations principales à la rémanence ont été trouvées : (i) un couplage antiparallèle entre les couches Co, (ii) une structure mono-domaine et (iii) un état vortex. Dans les nanofils Co (25 nm) / Cu (15 nm), en fonction de la direction du champ de saturation, les couches de Co peuvent présenter soit un couplage antiparallèle (champ de saturation perpendiculaire) ou un couplage de type vortex (champ de saturation en parallèle) avec un coeur aligné parallèlement à l'axe du fil. Cependant, 10% des nanofils étudié présente un état mono-domaine quel que soit le champ de saturation parallèle et perpendiculaire. Dans le cas Co (50 nm) / Cu (50 nm) et Co (25 nm) / Cu (45 nm), l'épaisseur plus grande de Cu séparant les couches ferromagnétiques réduit l'interaction magnétique entre des couches de Co voisines. L'état rémanent est donc formé de la combinaison de couches de Co monodomaines orientés perpendiculairement à l'axe du fil et de certains états vortex. Enfin pour la configuration Co (100 nm) / Cu (100 nm), un état monodomaine est observé quel que soit la direction du champ appliqué lors de la saturation. Toutes ces configurations magnétiques ont été déterminées et simulées à l'aide des calculs micromagnétiques jusqu'à ce qu'un accord quantitatif avec les résultats expérimentaux aient été obtenus. J'ai ainsi pu expliquer l'apparition et la stabilité de ces configurations en fonction des principaux paramètres magnétiques tels que l'échange, la valeur et la direction de l'anisotropie et l'aimantation. La comparaison entre les simulations et les résultats expérimentaux ont ainsi servi à déterminer précisément la valeur de ces paramètres. Dans les nanofils FeCoCu à diamètre modulé, une description détaillée de… Advisors/Committee Members: Warot, Bénédicte (thesis director), Gatel, Christophe (thesis director).

Subjects/Keywords: Nanofils; Configuration magnétique; Holographie électronique; Nanowires; Electron holography; Magnetic configurations; Multilayers

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APA (6^th Edition):

Reyes Vasquez, D. F. (2016). Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2016TOU30356

Chicago Manual of Style (16^th Edition):

Reyes Vasquez, David Fernando. “Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt.” 2016. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed March 06, 2021. http://www.theses.fr/2016TOU30356.

MLA Handbook (7^th Edition):

Reyes Vasquez, David Fernando. “Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt.” 2016. Web. 06 Mar 2021.

Vancouver:

Reyes Vasquez DF. Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2016. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2016TOU30356.

Council of Science Editors:

Reyes Vasquez DF. Magnetic configurations in Co-based nanowires explored by electron holography and micromagnetic calculations : Etudes par holographie électronique et calculs micromagnétiques de nanofils magnétiques à base de cobalt. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2016. Available from: http://www.theses.fr/2016TOU30356

3. Geetha, P. Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications.

Degree: 2014, Cochin University of Science and Technology

URL: http://dyuthi.cusat.ac.in/purl/4950

► Magnetism and magnetic materials have been playing a lead role in improving the quality of life. They are increasingly being used in a wide variety… (more)

▼ Magnetism and magnetic materials have been playing a lead role in improving the quality of life. They are increasingly being used in a wide variety of applications ranging from compasses to modern technological devices. Metallic glasses occupy an important position among magnetic materials. They assume importance both from a scientific and an application point of view since they represent an amorphous form of condensed matter with significant deviation from thermodynamic equilibrium. Metallic glasses having good soft magnetic properties are widely used in tape recorder heads, cores of high-power transformers and metallic shields. Superconducting metallic glasses are being used to produce high magnetic fields and magnetic levitation effect. Upon heat treatment, they undergo structural relaxation leading to subtle rearrangements of constituent atoms. This leads to densification of amorphous phase and subsequent nanocrystallisation. The short-range structural relaxation phenomenon gives rise to significant variations in physical, mechanical and magnetic properties. Magnetic amorphous alloys of Co-Fe exhibit excellent soft magnetic properties which make them promising candidates for applications as transformer cores, sensors, and actuators. With the advent of microminiaturization and nanotechnology, thin film forms of these alloys are sought after for soft under layers for perpendicular recording media. The thin film forms of these alloys can also be used for fabrication of magnetic micro electro mechanical systems (magnetic MEMS). In bulk, they are drawn in the form of ribbons, often by melt spinning. The main constituents of these alloys are Co, Fe, Ni, Si, Mo and B. Mo acts as the grain growth inhibitor and Si and B facilitate the amorphous nature in the alloy structure. The ferromagnetic phases such as Co-Fe and Fe-Ni in the alloy composition determine the soft magnetic properties. The grain correlation length, a measure of the grain size, often determines the soft magnetic properties of these alloys. Amorphous alloys could be restructured in to their nanocrystalline counterparts by different techniques. The structure of nanocrystalline material consists of nanosized ferromagnetic crystallites embedded in an amorphous matrix. When the amorphous phase is ferromagnetic, they facilitate exchange coupling between nanocrystallites. This exchange coupling results in the vanishing of magnetocrystalline anisotropy which improves the soft magnetic properties. From a fundamental perspective, exchange correlation length and grain size are the deciding factors that determine the magnetic properties of these nanocrystalline materials. In thin films, surfaces and interfaces predominantly decides the bulk property and hence tailoring the surface roughness and morphology of the film could result in modified magnetic properties. Surface modifications can be achieved by thermal annealing at various temperatures. Ion irradiation is an alternative tool to modify the surface/structural properties. The surface evolution of a thin film…

Subjects/Keywords: magnetic properties; Co-Fe thin films; Swift Heavy Ion Irradiation; Thermal Annealing; Magnetoelectric Multilayers

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

APA (6^th Edition):

Geetha, P. (2014). Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/4950

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):

Geetha, P. “Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications.” 2014. Thesis, Cochin University of Science and Technology. Accessed March 06, 2021. http://dyuthi.cusat.ac.in/purl/4950.

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

MLA Handbook (7^th Edition):

Geetha, P. “Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications.” 2014. Web. 06 Mar 2021.

Vancouver:

Geetha P. Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications. [Internet] [Thesis]. Cochin University of Science and Technology; 2014. [cited 2021 Mar 06]. Available from: http://dyuthi.cusat.ac.in/purl/4950.

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

Council of Science Editors:

Geetha P. Tailoring Magnetic Properties of Co-Fe Thin Films by Topographical Modifications Using Thermal Annealing and Swift Heavy Ion Irradiation and Fabrication of Magnetoelectric Multilayers for Device Applications. [Thesis]. Cochin University of Science and Technology; 2014. Available from: http://dyuthi.cusat.ac.in/purl/4950

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

University of Colorado

4. Turgut, Emrah. Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light.

Degree: PhD, Physics, 2014, University of Colorado

URL: https://scholar.colorado.edu/phys_gradetds/108

► Next-generation magnetic-memory devices and heat-assisted magnetic-recording applications will require a better understanding of magnetic multilayers and their interactions with optical-laser pulses. In this thesis,… (more)

Subjects/Keywords: Femtomagnetism; Magnetic Multilayers; Magnetization; Spintronics; Ultrafast; X-ray; Condensed Matter Physics; Optics

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

APA (6^th Edition):

Turgut, E. (2014). Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/phys_gradetds/108

Chicago Manual of Style (16^th Edition):

Turgut, Emrah. “Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light.” 2014. Doctoral Dissertation, University of Colorado. Accessed March 06, 2021. https://scholar.colorado.edu/phys_gradetds/108.

MLA Handbook (7^th Edition):

Turgut, Emrah. “Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light.” 2014. Web. 06 Mar 2021.

Vancouver:

Turgut E. Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light. [Internet] [Doctoral dissertation]. University of Colorado; 2014. [cited 2021 Mar 06]. Available from: https://scholar.colorado.edu/phys_gradetds/108.

Council of Science Editors:

Turgut E. Studying Laser-Induced Spin Currents Using Ultrafast Extreme Ultraviolet Light. [Doctoral Dissertation]. University of Colorado; 2014. Available from: https://scholar.colorado.edu/phys_gradetds/108

University of South Florida

5. Lovelady, Douglas Carroll. A Study of Complex Systems: from Magnetic to Biological.

Degree: 2011, University of South Florida

URL: https://scholarcommons.usf.edu/etd/3216

► This work is a study of complex many-body systems with non-trivial interactions. Many such systems can be described with models that are much simpler than… (more)

Subjects/Keywords: cancer; fractional Brownian motion; magnetic anisotropy; magnetic multilayers; random walk; American Studies; Arts and Humanities; Biophysics; Other Physics; Physics

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

APA (6^th Edition):

Lovelady, D. C. (2011). A Study of Complex Systems: from Magnetic to Biological. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/3216

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):

Lovelady, Douglas Carroll. “A Study of Complex Systems: from Magnetic to Biological.” 2011. Thesis, University of South Florida. Accessed March 06, 2021. https://scholarcommons.usf.edu/etd/3216.

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

MLA Handbook (7^th Edition):

Lovelady, Douglas Carroll. “A Study of Complex Systems: from Magnetic to Biological.” 2011. Web. 06 Mar 2021.

Vancouver:

Lovelady DC. A Study of Complex Systems: from Magnetic to Biological. [Internet] [Thesis]. University of South Florida; 2011. [cited 2021 Mar 06]. Available from: https://scholarcommons.usf.edu/etd/3216.

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

Council of Science Editors:

Lovelady DC. A Study of Complex Systems: from Magnetic to Biological. [Thesis]. University of South Florida; 2011. Available from: https://scholarcommons.usf.edu/etd/3216

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

6. Teixeira, Bruno Miguel da Silva. Ferromagnetic multilayers with programmable magnetic anisotropy .

Degree: 2020, Universidade de Aveiro

URL: http://hdl.handle.net/10773/29812

► This work focuses on the modification of magnetic anisotropy of ferromagnetic multilayers towards the goal of obtaining the easy-cone magnetic state. Two types of magnetic… (more)

▼ This work focuses on the modification of magnetic anisotropy of ferromagnetic multilayers towards the goal of obtaining the easy-cone magnetic state. Two types of magnetic multilayer systems are explored: NdCo5/Fe bilayer and magnetic tunnel junctions (MTJ) in half-stack (FeCoB free layer grown on MgO) and full-stack configuration. The effects of interlayer coupling, layer thickness, interfaces, spacers as well as the impact of ion irradiation on the magnetic anisotropy of the multilayers were investigated primarily by ferromagnetic resonance (FMR) and complemented by X-ray diffraction, vibrating sample magnetometry and current-in-plane tunneling measurements. Macrospin models were developed on the basis of the Smit-Beljers formalism and of the linearized Landau-Lifshitz-Gilbert equation to simulate angular dependences of resonance field and linewidth as well as microwave absorption curves. The NdCo5/Fe bilayer was prepared by pulsed laser deposition and the influence of the spin reorientation transition (SRT) of NdCo5 on the bilayer’s magnetic properties was investigated. The SRT temperatures of the bilayer were determined as 255 K and 350 K and an interfacial coupling energy of 1.4 mJ · m−2 was estimated. Due to the coupling, the precession of magnetic moments of the Fe layer occurs in the effective exchange field stemming from the NdCo5. As a result of the interlayer coupling, there is a transfer of magnetic anisotropy from NdCo5 to the Fe, which allowed the SRT of NdCo5 to be seen indirectly, by tracking the temperature variation of the Fe FMR field. MgO/FeCoB(tFCB)/Ta free-layer stacks and perpendicular magnetic tunnel junction (pMTJ) pillars having identical free layers were prepared by magnetron sputtering. Tunnel magnetoresistance (TMR) measurements and FMR revealed a gradual evolution of the free-layer behavior from that of a continuous film at large tFCB towards that of an ensemble of weakly coupled grains for tFCB <1.3 nm. A correlation was found between the intergrain coupling, the inhomogeneous broadening of the FMR line and the second-order magnetic anisotropy constant, K2, required for the onset of the easy-cone state. The micromagnetic nature of K2 was experimentally demonstrated. Its magnitude depends on the balance between the fluctuations of the effective first-order perpendicular magnetic anisotropy (PMA) term, δK1eff, and the intergrain exchange. Double-MgO free layers, MgO/FeCoB/MgO, with and without a 0.2-nm-thick Ta or W spacer inserted in FeCoB, were also prepared. The spacers enhanced both K1eff and K2, allowing the easy cone to be kept in thicker FeCoB layers. The increase of K1eff and the corresponding quadratic scaling of |K2 | with decreasing temperature allowed inducing easy-cone states in a wide range of temperatures. Alongside the improved conditions for setting an easy cone in the MgO/FeCoB/MgO free layers, an easy-cone configuration with an almost temperature-independent opening angle was demonstrated for a MgO/FeCoB(1.6 nm)/Ta free layer. A… Advisors/Committee Members: Sobolev, Nikolai Andreevitch (advisor), Timopheev, Andrey (advisor).

Subjects/Keywords: Ferromagnetic multilayers; Magnetic anisotropy; Ferromagnetic resonance; NdCo5; Spin-reorientation transition; FeCoB; Perpendicular magnetic tunnel junction; Easy-cone anisotropy; Ion irradiation

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

APA (6^th Edition):

Teixeira, B. M. d. S. (2020). Ferromagnetic multilayers with programmable magnetic anisotropy . (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/29812

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):

Teixeira, Bruno Miguel da Silva. “Ferromagnetic multilayers with programmable magnetic anisotropy .” 2020. Thesis, Universidade de Aveiro. Accessed March 06, 2021. http://hdl.handle.net/10773/29812.

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

MLA Handbook (7^th Edition):

Teixeira, Bruno Miguel da Silva. “Ferromagnetic multilayers with programmable magnetic anisotropy .” 2020. Web. 06 Mar 2021.

Vancouver:

Teixeira BMdS. Ferromagnetic multilayers with programmable magnetic anisotropy . [Internet] [Thesis]. Universidade de Aveiro; 2020. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10773/29812.

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

Council of Science Editors:

Teixeira BMdS. Ferromagnetic multilayers with programmable magnetic anisotropy . [Thesis]. Universidade de Aveiro; 2020. Available from: http://hdl.handle.net/10773/29812

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

Université Montpellier II

7. Dehbaoui, Mourad. Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds.

Degree: Docteur es, Physique, 2013, Université Montpellier II

URL: http://www.theses.fr/2013MON20128

►

Dans un effort de combiner le bénéfice des propriétés magnétiques et électroniques, les semi-Conducteurs magnétiques dilués sont projetés pour être à la base de composants… (more)

▼

Dans un effort de combiner le bénéfice des propriétés magnétiques et électroniques, les semi-Conducteurs magnétiques dilués sont projetés pour être à la base de composants reliant dans leur fonctionnement, à la fois la charge et le spin des électrons. Par l'utilisation d'une technique de magnétométrie à effet Hall, on a fait la caractérisation de ces matériaux par la détermination de l'orientation magnétique à basse température. Nous nous sommes aussi intéressés aux matériaux moléculaires à transition de spin (SCO). La technologie des capteurs magnétiques offre une voie vers la vulgarisation des techniques de détection par l'utilisation de systèmes rapides et sensibles. La détection de la transition de spin des nanoparticules est réalisée par un capteur à effet Hall planaire, fabriqué à base de multicouches magnétiques. Le travail effectué est pionnier dans le domaine de la détection nano magnétique, il ouvre la voie à de nouvelles perspectives dans la recherche fondamentale et dans le développement technologique des capteurs magnétiques. Des améliorations du dispositif ont été réalisées et d'autres sont en stage de développement pour l'amélioration de la sensibilité et la réduction du bruit. L'optimisation devrait fournir un dispositif original de détection de transition de spin des nanoparticules à température ambiante.

In an effort to combine the benefits of magnetic and electronic properties, diluted magnetic semiconductors are projected to be the basis for devices combining in their operation, both the charge and spin of electrons. Using Hall Effect magnetometer, a characterization of these materials is done by determining the magnetic orientation at low temperatures. We were also interested in molecular materials spin crossover. The magnetic sensor technology provides a path to the extension of detection techniques through the use of rapid and sensitive systems. The detection of the spin crossover nanoparticles is achieved by a planar Hall Effect sensor, made from magnetic multilayers. The work is a pioneer in the field of nano magnetic detection; it opens up new perspectives in basic research and the technological development of magnetic sensors. Improvements of the device have been completed and others are under development in order to improve sensitivity and reduce noise. The optimization should provide a novel system for detecting spin transition nanoparticles at room temperature.

Advisors/Committee Members: Charar, Salam (thesis director), Terki, Férial (thesis director).

Subjects/Keywords: Dms; Multicouches magnétique; Magnéto transport; Nanoparticules; Capteur magnétique; Effet Hall; Dms; Magnetic multilayers; Magneto transport; Nanoparticles; Magnetic sensor; Hall Effect

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

APA (6^th Edition):

Dehbaoui, M. (2013). Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2013MON20128

Chicago Manual of Style (16^th Edition):

Dehbaoui, Mourad. “Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds.” 2013. Doctoral Dissertation, Université Montpellier II. Accessed March 06, 2021. http://www.theses.fr/2013MON20128.

MLA Handbook (7^th Edition):

Dehbaoui, Mourad. “Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds.” 2013. Web. 06 Mar 2021.

Vancouver:

Dehbaoui M. Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds. [Internet] [Doctoral dissertation]. Université Montpellier II; 2013. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2013MON20128.

Council of Science Editors:

Dehbaoui M. Analyses structurales et contrôle de l'aimantation par sonde de Hall planaire dans des dispositifs nanostructurés : Structural analysis and magnetisation control with planar Hall sensor in nanostructural compounds. [Doctoral Dissertation]. Université Montpellier II; 2013. Available from: http://www.theses.fr/2013MON20128

8. Rementer, Colin Richard. Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications.

Degree: Chemical Engineering, 2017, UCLA

URL: http://www.escholarship.org/uc/item/4vz5435c

► This work focuses on the design, synthesis, characterization and integration of soft ferromagnetic multilayer structures for their applications in high frequency applications. Presently, the form… (more)

▼ This work focuses on the design, synthesis, characterization and integration of soft ferromagnetic multilayer structures for their applications in high frequency applications. Presently, the form factor of current telecommunication devices, i.e., antenna, is fundamentally limited by the wavelength it is designed to transmit or receive. In order to adapt to new technologies, a method for subverting this paradigm has been developed by use of magnetoelectric, strain-coupled multiferroic systems, which requires optimized ferroic materials, especially ferromagnetic thin films. Two approaches were considered to achieve this goal, doping (boron) and multilayer (NiFe) heterostructures, where FeGa was selected as the reference phase for both approaches. Doping magnetic materials with boron has been shown to enhance the magnetic softness while maintaining magnetostriction. Multilayer heterostructures offer thepossibility of tuning magnetic responses by taking advantage of materials with complementary magnetic properties.Iron-gallium-boron (FeGaB) was synthesized via co-sputtering of Fe75Ga25 and boron. The addition of boron to Fe75Ga25 reduced the magnetocrystalline anisotropy energy, enhancing the high frequency properties. Magnetometry studies showed that the coercivity was reduced by 70% with 15% boron (at. %) while maintaining 90% of the magnetization of FeGa. Fixed frequency FMR studies showed that the addition of boron reduced the linewidth by up to 70% to a value of 210 Oe. Electrically poled hysteresis measurements showed that the film has a saturation magnetostriction of 50 με. FeGaB’s properties were shown to be tunable and can be optimized by controlling the boron concentration within 11-15% but this approach did not yield the desired FMR linewidth.Multilayers of sputtered Fe85Ga15/Ni81Fe19, or FeGa/NiFe, were examined to tailor their magnetic softness, loss at microwave frequencies, permeability, and magnetoelasticity, leveraging the magnetic softness and low loss of NiFe, and the high saturation magnetostriction (λs) and magnetization (MS) of FeGa. A systematic change was observed as the number of bilayers or interfaces increases: a seven-bilayer structure results in an 88% reduction in coercivity and a 55% reduction in FMR linewidth at X-band compared to a single phase FeGa film, while maintaining a high relative permeability of 700. The magnetostriction was slightly reduced by the addition of NiFe but still maintained up to 70% that of single phase FeGa. Analyses of the domain size revealed that this effect is a function of the layer thicknesses: thinner layers have larger in-plane domains, leading to lower coercivity. The depth-dependentcomposition and magnetization of these heterostructures as a function of magnetic and electric fields were assessed via polarized neutron reflectometry and the rotation of magnetization of the individual layers with applied strain was found to be deterministic. The tunability of these magnetic heterostructures makes them suitable candidates for RF magnetic applications requiring…

Subjects/Keywords: Materials Science; Composite Multiferroic; Magnetic Multilayers; Magnetostriction

…87 4.2 Magnetic Properties of FeGa and NiFe Multilayers… …42 2.3 Magnetic Characterization… …79 Chapter 4 : Growth and Characterization of FeGa/NiFe Multilayers… …92 4.3 Interfacial Magnetism of FeGa and NiFe Multilayers… …2 Figure 1-2. Diagram of in-phase and orthogonal oscillating magnetic and electric…

11 more images…

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APA (6^th Edition):

Rementer, C. R. (2017). Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/4vz5435c

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):

Rementer, Colin Richard. “Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications.” 2017. Thesis, UCLA. Accessed March 06, 2021. http://www.escholarship.org/uc/item/4vz5435c.

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

MLA Handbook (7^th Edition):

Rementer, Colin Richard. “Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications.” 2017. Web. 06 Mar 2021.

Vancouver:

Rementer CR. Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications. [Internet] [Thesis]. UCLA; 2017. [cited 2021 Mar 06]. Available from: http://www.escholarship.org/uc/item/4vz5435c.

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

Council of Science Editors:

Rementer CR. Tuning Magnetic Properties of Soft Ferromagnetic Thin Films for High Frequency Applications. [Thesis]. UCLA; 2017. Available from: http://www.escholarship.org/uc/item/4vz5435c

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

University of New Orleans

9. Chalastaras, Athanasios. Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface.

Degree: MS, Physics, 2004, University of New Orleans

URL: https://scholarworks.uno.edu/td/162

► Previous research on new novel substrates for giant magnoresistance structures has indicated that a net increase in the effect is present. The substrates studied were… (more)

Subjects/Keywords: GMR; Metallic multilayers Magnetic sensors; Spin valve

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APA (6^th Edition):

Chalastaras, A. (2004). Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface. (Thesis). University of New Orleans. Retrieved from https://scholarworks.uno.edu/td/162

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):

Chalastaras, Athanasios. “Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface.” 2004. Thesis, University of New Orleans. Accessed March 06, 2021. https://scholarworks.uno.edu/td/162.

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

MLA Handbook (7^th Edition):

Chalastaras, Athanasios. “Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface.” 2004. Web. 06 Mar 2021.

Vancouver:

Chalastaras A. Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface. [Internet] [Thesis]. University of New Orleans; 2004. [cited 2021 Mar 06]. Available from: https://scholarworks.uno.edu/td/162.

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

Council of Science Editors:

Chalastaras A. Giant Magnetoresistance in Magnetic Multilayers Using a New Embossed Surface. [Thesis]. University of New Orleans; 2004. Available from: https://scholarworks.uno.edu/td/162

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

10. Markou, Anastasios. Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films.

Degree: 2014, University of Ioannina; Πανεπιστήμιο Ιωαννίνων

URL: http://hdl.handle.net/10442/hedi/39605

►

The 3d transition metal alloys are today prospective materials for high density magnetic recording. These include the chemically ordered FePt, CoPt, CrPt3 alloys and the… (more)

▼

The 3d transition metal alloys are today prospective materials for high density magnetic recording. These include the chemically ordered FePt, CoPt, CrPt3 alloys and the Co/Pt superlattices. The main goal of this work is to provide a comprehensive morphological, structural and magnetic characterization of nanostructured films. The work focuses on four different areas that deal with the optimization of these materials by control of their magnetic anisotropy and microstructural characteristics.Firstly, the effect of layering and thickness studied in CrPt3 and CoPt films: In films obtained by heat-treatment of bilayers and trilayers (of different Co/Pt content) higher degree of chemical ordering and coercivity can be achieved compared to single layer films. The TEM analysis of Co-Pt films reveals that the twin density in trilayers is larger compared to single layers. The average size of grains in CoPt single layers are 32nm, while the average size of Co/CoPt/Pt trilayers is 42nm.Secondly, the study of the effect of layering and magnetic annealing on the texture of Co/Pt multilayers shows that the (001) texture sets in as a result of transformation strain driven selective grain growth of (001) at expense of the other possible textures. This correlation between strain and texture is clear only for magnetically annealed samples. This shows that the main function of the applied field is to correlate local strains in a macroscopic level thus increasing their effect along with directly driving the formation of easy axis (001) towards its direction. Thirdly, the study of switching behavior of regular magnetic FePt nanoislands obtained by sputter deposition of the magnetic layer on monolayers of polystyrene nanospheres (of 970nm and 173nm diameter) used as masks. The nanoislands are magnetically hard and are characterized by non-zero dM-plots. These findings were compared with micromagnetic modeling studies which shows that for anisotropy values high enough to match the observed coercivity, multidomain islands can result in due to the existence of either a softer part or different anisotropy direction part within each magnetic entity. Finally, the previous approach is extended to the study of magnetization reversal in graded anisotropy Co/Pt multilayers which are deposited both onto nanospheres and Si substrates for comparison. The study was based on First Order Reversal Curve diagrams (FORC). Using regular nanostructures the following complication that the study of grade anisotropy films presents, can be dealt with if the thickness exceeds a certain limit above which the formation of stripe domains becomes favorable the straight forward interpretation of the effect of the anisotropy profile on the reversal is not possible. It is found that multilayers can be used to create model graded perpendicular anisotropy systems only when lateral domain propagation is suppressed by appropriate nanostructuration.

Στην παρούσα εργασία πραγματοποιήθηκε ο μορφολογικός, μαγνητικός και δομικός χαρακτηρισμός νανοδομημένων υμενίων υψηλής…

Subjects/Keywords: Νανοτεχνολογία; Μαγνητική εγγραφή; Λεπτά υμένια; Πολυστρωματικά υμένια; Μαγνητισμός; ΚΑΘΕΤΗ ΑΝΙΣΟΤΡΟΠΙΑ; Νανόσφαιρες; Μαγνητική ανόπτηση; Νanotechnology; Magnetic recording; Thin films; Multilayers; Magnetism; PERPENDICULAR ANISOTROPY; Nanospheres; Magnetic Annealing

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

APA (6^th Edition):

Markou, A. (2014). Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films. (Thesis). University of Ioannina; Πανεπιστήμιο Ιωαννίνων. Retrieved from http://hdl.handle.net/10442/hedi/39605

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):

Markou, Anastasios. “Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films.” 2014. Thesis, University of Ioannina; Πανεπιστήμιο Ιωαννίνων. Accessed March 06, 2021. http://hdl.handle.net/10442/hedi/39605.

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

MLA Handbook (7^th Edition):

Markou, Anastasios. “Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films.” 2014. Web. 06 Mar 2021.

Vancouver:

Markou A. Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films. [Internet] [Thesis]. University of Ioannina; Πανεπιστήμιο Ιωαννίνων; 2014. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10442/hedi/39605.

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

Council of Science Editors:

Markou A. Nanostructured high magnetic anisotopy Pt-TM (TM=Co, Fe, Cr) films. [Thesis]. University of Ioannina; Πανεπιστήμιο Ιωαννίνων; 2014. Available from: http://hdl.handle.net/10442/hedi/39605

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

Université de Grenoble

11. Merodio Camara, Pablo. Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques.

Degree: Docteur es, Physique de la matière condensée et du rayonnement, 2014, Université de Grenoble

URL: http://www.theses.fr/2014GRENY072

►

En électronique de spin, le couple de transfert de spin (STT) et la magnétorésistance tunnel (TMR) dans les jonctions tunnel magnétiques à électrodes ferromagnétiques (F)… (more)

▼

En électronique de spin, le couple de transfert de spin (STT) et la magnétorésistance tunnel (TMR) dans les jonctions tunnel magnétiques à électrodes ferromagnétiques (F) sont deux phénomènes physiques essentiels. Dans cette thèse, nous présentons une étude théorique du STT dans des jonctions tunnel antiferromagnétiques (AF), où deux électrodes non-plus F mais AF sont séparées par une barrière isolante non-magnétique. Plus concrètement, les comportements du STT et de la TMR sont étudiés dans des jonctions tunnel AF cristallines, et ce, à l´aide de calculs de liaisons fortes dans le cadre du formalisme de Keldysh. Nous avons observé une distribution spatiale de la composante perpendiculaire du STT régulière et de signe alternatif, ce qui est similaire au comportement de la composante parallèle. Ces variations spatiales de la composante perpendiculaire sont cependant spécifiques à l'utilisation d'une barrière tunnel et contrastent avec les effets observés par le passé pour le cas de couches séparatrices métalliques. De plus, contrairement aux jonctions tunnel F conventionnelles, nous avons montré que la TMR peut augmenter avec la tension appliquée et atteindre des valeurs du même ordre de grandeur que pour des vannes de spin usuelles : tout-métallique et à électrodes F.L´analyse effectuée pour des AF est ensuite étendue aux matériaux ferrimagnétiques (FI), pour lesquels les AF constituent, somme toute, des cas limites. La complexité magnétique additionnelle inhérente aux FI se traduit par un comportement spatial du STT beaucoup plus riche dans les jonctions tunnel FI. Nous observons notamment que les paramètres électroniques tels que les largeurs et les décalages de bandes ont une très forte influence sur le STT. Plus particulièrement, la différence entre les couplages d'échange inter-spin locaux des deux sous-réseaux du FI donne lieu à une distribution spatiale du STT ondulatoire qui est modulée par la densité locale de spin. Il est possible d'ajuster cet effet en jouant sur la tension appliquée aux bornes de la jonction tunnel FI. Nous trouvons de plus que la différence entre les couplages d'échange inter-spin locaux constitue un paramètre fondamental pour la quantification des longueurs caractéristiques du STT dans les FIs. Ce paramètre peut être considéré comme un champ d´échange effectif, par similitude avec le cas usuel des Fs qui présentent un champ d´échange homogène.Pour finir, nous avons sondé expérimentalement les longueurs caractéristiques du STT dans des AFs. Pour de l'Ir20Mn80 et du Fe50Mn50, nous avons déterminé les longueurs de pénétration de spin et les mécanismes d'absorption de courants de spin à température ambiante en utilisant la résonance F et le pompage de spin. Plus précisément, nous avons associé les profondeurs de pénétration critiques à deux mécanismes d'absorption distincts: du déphasage pour l´Ir20Mn80 et du retournement de spin pour le Fe50Mn50.

Spin transfer torque (STT) and tunnelling magnetoresistance (TMR) in magnetic tunnel junctions with ferromagnetic (F) leads are two essential…

Advisors/Committee Members: Chshiev, Mairbek (thesis director), Baltz, Vincent (thesis director), Béa, Hélène (thesis director).

Subjects/Keywords: Couple de transfert de spin; Multicouches magnetiques; Spintronique; Magnétorésistance; Dynamique de l’aimantation; Spin pumping; Spin torque/spin transfer effect; Magnetic multilayers; Spintronics; Magnetoresistance; Magnetization dynamics; Spin pumping; 530

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

APA (6^th Edition):

Merodio Camara, P. (2014). Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2014GRENY072

Chicago Manual of Style (16^th Edition):

Merodio Camara, Pablo. “Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques.” 2014. Doctoral Dissertation, Université de Grenoble. Accessed March 06, 2021. http://www.theses.fr/2014GRENY072.

MLA Handbook (7^th Edition):

Merodio Camara, Pablo. “Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques.” 2014. Web. 06 Mar 2021.

Vancouver:

Merodio Camara P. Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques. [Internet] [Doctoral dissertation]. Université de Grenoble; 2014. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2014GRENY072.

Council of Science Editors:

Merodio Camara P. Spin dependent transport in antiferro and ferrimagnetic nanostructures : Transport dépendant du spin dans des nanostructures antiferro et ferrimagnétiques. [Doctoral Dissertation]. Université de Grenoble; 2014. Available from: http://www.theses.fr/2014GRENY072

12. Legrand, William. Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches.

Degree: Docteur es, Physique, 2019, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2019SACLS066

► Les skyrmions magnétiques sont des enroulements bidimensionnels et nanométriques de la configuration de spin, pouvant être stabilisés dans certains matériaux magnétiques soumis à l’interaction d’échange… (more)

▼ Les skyrmions magnétiques sont des enroulements bidimensionnels et nanométriques de la configuration de spin, pouvant être stabilisés dans certains matériaux magnétiques soumis à l’interaction d’échange antisymétrique Dzyaloshinskii-Moriya. Ils présentent une topologie non-triviale et s’annoncent peut-être comme étant les plus petites configurations magnétiques pouvant être réalisées. Très récemment, des skyrmions magnétiques ont pu être stabilisés à température ambiante grâce à la conception de multicouches magnétiques brisant la symétrie d’inversion selon la direction verticale. Suite à cette avancée, l’objectif central de cette thèse est la compréhension et la maîtrise des multiples propriétés physiques des skyrmions hébergés dans ces systèmes multicouches. Pour aborder cet objectif, un modèle original est décrit puis employé, permettant la prédiction des profils adoptés par les skyrmions multicouches. Ce modèle numérique est très générique, n’utilisant que la symétrie cylindrique des skyrmions afin de simplifier la détermination des interactions magnétostatiques. Ce modèle est ensuite étendu afin de pouvoir approximer la stabilité thermique des skyrmions, ce qui constitue un élément clé dans leur obtention expérimentale. Une seconde dimension de ce travail consiste en l’étude expérimentale de la manipulation électrique des skyrmions multicouches, démontrant la possibilité de trois fonctionnalités centrales que sont leur nucléation par courants locaux, leur déplacement sous courant de spin et leur détection électrique individuelle par tension transverse. Le troisième aspect de ma thèse est l’étude des propriétés physiques influençant le déplacement des skyrmions dans les multicouches magnétiques. Un comportement d’ancrage sur des défauts est mis en évidence expérimentalement et est analysé à l’aide d’une modélisation micromagnétique. Un des résultats importants de ce travail est aussi la prédiction d’une chiralité hybride dans les configurations magnétiques de certaines multicouches, qui est ensuite démontrée expérimentalement par des mesures au synchrotron. Les conséquences attendues de cette chiralité hybride sur le déplacement des skyrmions sont étudiées pour permettre l’optimisation des multicouches, aboutissant à l’observation expérimentale de la propagation de skyrmions de 50 nm de rayon à des vitesses atteignant environ 40 m/s. La dernière partie de cette thèse vise à mettre à profit ces avancées théoriques et expérimentales afin de parvenir à réduire la taille des skyrmions à température ambiante. Après avoir analysé l’impact des interactions dipolaires sur la stabilité des skyrmions, il est entrepris d’optimiser les matériaux et la périodicité des couches. Je m’intéresse aussi à la conception expérimentale de textures magnétiques dont l’aimantation est compensée au sein de structures multicouches appelées antiferromagnétiques synthétiques, dont je montre qu’elles peuvent héberger des skyrmions antiferromagnétiques à température ambiante. Ce résultat final ouvre de nouvelles perspectives vers l’obtention… Advisors/Committee Members: Cros, Vincent (thesis director).

Subjects/Keywords: Magnétisme; Spintronique; Skyrmion; Interaction Dzyaloshinskii-Moriya; Multicouches magnétiques; Dynamique induite par courant; Magnetism; Spintronics; Skyrmion; Dzyaloshinskii-Moriya interaction; Magnetic multilayers; Current-induced dynamics

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

APA (6^th Edition):

Legrand, W. (2019). Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2019SACLS066

Chicago Manual of Style (16^th Edition):

Legrand, William. “Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches.” 2019. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 06, 2021. http://www.theses.fr/2019SACLS066.

MLA Handbook (7^th Edition):

Legrand, William. “Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches.” 2019. Web. 06 Mar 2021.

Vancouver:

Legrand W. Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2019. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2019SACLS066.

Council of Science Editors:

Legrand W. Crafting magnetic skyrmions at room temperature : size, stability and dynamics in multilayers : Élaboration de skyrmions magnétiques à température ambiante : taille, stabilité et dynamique dans les multicouches. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2019. Available from: http://www.theses.fr/2019SACLS066

Loughborough University

13. Kovacs, Endre. Numerical simulation of magnetic nanoparticles.

Degree: PhD, 2005, Loughborough University

URL: http://hdl.handle.net/2134/7742

► We solved the Landau-Lifshitz equations numerically to examine the time development of a system of magnetic particles. Constant or periodical external magnetic field has been… (more)

Subjects/Keywords: 530.41; Magnetic nanoparticles; Multilayers; Chaos; Hysteresis; Landau-Lifshitz equations; Magnetisation reversal

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

APA (6^th Edition):

Kovacs, E. (2005). Numerical simulation of magnetic nanoparticles. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/7742

Chicago Manual of Style (16^th Edition):

Kovacs, Endre. “Numerical simulation of magnetic nanoparticles.” 2005. Doctoral Dissertation, Loughborough University. Accessed March 06, 2021. http://hdl.handle.net/2134/7742.

MLA Handbook (7^th Edition):

Kovacs, Endre. “Numerical simulation of magnetic nanoparticles.” 2005. Web. 06 Mar 2021.

Vancouver:

Kovacs E. Numerical simulation of magnetic nanoparticles. [Internet] [Doctoral dissertation]. Loughborough University; 2005. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2134/7742.

Council of Science Editors:

Kovacs E. Numerical simulation of magnetic nanoparticles. [Doctoral Dissertation]. Loughborough University; 2005. Available from: http://hdl.handle.net/2134/7742

Vanderbilt University

14. Fu, Yang. Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films.

Degree: MS, Interdisciplinary Materials Science, 2006, Vanderbilt University

URL: http://hdl.handle.net/1803/14950

► FePt alloys with the CuAuI L10-ordered structure are important magnetic materials since their large uniaxial magnetocrystalline anisotropy can overcome the thermal stability problem of high-density… (more)

Subjects/Keywords: Thin films Multilayered – Magnetic properties; FePt/MgO multilayers; microstructure; Transmission electron microscopy; magnetic properties; heat-assisted perpendicular magnetic recording; TEM; EFTEM

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APA (6^th Edition):

Fu, Y. (2006). Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14950

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):

Fu, Yang. “Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films.” 2006. Thesis, Vanderbilt University. Accessed March 06, 2021. http://hdl.handle.net/1803/14950.

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

MLA Handbook (7^th Edition):

Fu, Yang. “Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films.” 2006. Web. 06 Mar 2021.

Vancouver:

Fu Y. Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films. [Internet] [Thesis]. Vanderbilt University; 2006. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/1803/14950.

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

Council of Science Editors:

Fu Y. Microstructure and Magnetic Properties of FePt/MgO Multilayered Thin Films. [Thesis]. Vanderbilt University; 2006. Available from: http://hdl.handle.net/1803/14950

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

15. Dunn, Joel H. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.

Degree: 2013

URL: http://hdl.handle.net/2249.1/62504

Subjects/Keywords: magnetostriction; magneto-optical; Kerr effect; magnetic anisotropy; magnetic thin films; ferromagnetic domains; multilayers; laser optics; TbFe; FeCo

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APA (6^th Edition):

Dunn, J. H. (2013). Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. (Thesis). [No school.] Retrieved from http://hdl.handle.net/2249.1/62504

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No school.

Chicago Manual of Style (16^th Edition):

Dunn, Joel H. “Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.” 2013. Thesis, [No school]. Accessed March 06, 2021. http://hdl.handle.net/2249.1/62504.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No school.

MLA Handbook (7^th Edition):

Dunn, Joel H. “Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.” 2013. Web. 06 Mar 2021.

Vancouver:

Dunn JH. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. [Internet] [Thesis]. [No school]; 2013. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2249.1/62504.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No school.

Council of Science Editors:

Dunn JH. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. [Thesis]. [No school]; 2013. Available from: http://hdl.handle.net/2249.1/62504

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No school.

16. TAIEBEH TAHMASEBI. Perpendicular magnetic anisotropy materials for magnetic random access memory applications.

Degree: 2012, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/37907

Subjects/Keywords: magnetic random access memory; STT-MRAM; perpendicular magnetic anisotropy; PMA; L10 FePt; Co/Pd multilayers; CoFeB with PMA; MTJ stack; pMTJ

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

APA (6^th Edition):

TAHMASEBI, T. (2012). Perpendicular magnetic anisotropy materials for magnetic random access memory applications. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/37907

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):

TAHMASEBI, TAIEBEH. “Perpendicular magnetic anisotropy materials for magnetic random access memory applications.” 2012. Thesis, National University of Singapore. Accessed March 06, 2021. http://scholarbank.nus.edu.sg/handle/10635/37907.

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

MLA Handbook (7^th Edition):

TAHMASEBI, TAIEBEH. “Perpendicular magnetic anisotropy materials for magnetic random access memory applications.” 2012. Web. 06 Mar 2021.

Vancouver:

TAHMASEBI T. Perpendicular magnetic anisotropy materials for magnetic random access memory applications. [Internet] [Thesis]. National University of Singapore; 2012. [cited 2021 Mar 06]. Available from: http://scholarbank.nus.edu.sg/handle/10635/37907.

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

Council of Science Editors:

TAHMASEBI T. Perpendicular magnetic anisotropy materials for magnetic random access memory applications. [Thesis]. National University of Singapore; 2012. Available from: http://scholarbank.nus.edu.sg/handle/10635/37907

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

17. MARIA PATRICIA ROUELLI GARCIA SABINO. Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications.

Degree: 2014, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/118580

Subjects/Keywords: ferromagnetic resonance; magnetic fi lms; Co/Ni multilayers; CoFeB/MgO; damping; perpendicular magnetic anisotropy

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

APA (6^th Edition):

SABINO, M. P. R. G. (2014). Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/118580

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):

SABINO, MARIA PATRICIA ROUELLI GARCIA. “Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications.” 2014. Thesis, National University of Singapore. Accessed March 06, 2021. http://scholarbank.nus.edu.sg/handle/10635/118580.

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

MLA Handbook (7^th Edition):

SABINO, MARIA PATRICIA ROUELLI GARCIA. “Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications.” 2014. Web. 06 Mar 2021.

Vancouver:

SABINO MPRG. Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications. [Internet] [Thesis]. National University of Singapore; 2014. [cited 2021 Mar 06]. Available from: http://scholarbank.nus.edu.sg/handle/10635/118580.

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

Council of Science Editors:

SABINO MPRG. Ferromagnetic Resonance Studies of Low Damping Multilayer Films with perpendicular Magnetic Anisotropy for Memory Applications. [Thesis]. National University of Singapore; 2014. Available from: http://scholarbank.nus.edu.sg/handle/10635/118580

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

Texas State University – San Marcos

18. Dunn, Joel H. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.

Degree: MS, Physics, 2006, Texas State University – San Marcos

URL: https://digital.library.txstate.edu/handle/10877/4008

No abstract prepared. Advisors/Committee Members: Geerts, Ir. Wilhelmus J. (advisor), Galloway, Heather C. (committee member), Michalk, Victor (committee member).

Subjects/Keywords: Magnetostriction; Magneto-optical; Kerr effect; Magnetic anisotropy; Magnetic thin films; Ferromagnetic domains; Multilayers; Laser optics; TbFe; FeCo

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

APA (6^th Edition):

Dunn, J. H. (2006). Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. (Masters Thesis). Texas State University – San Marcos. Retrieved from https://digital.library.txstate.edu/handle/10877/4008

Chicago Manual of Style (16^th Edition):

Dunn, Joel H. “Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.” 2006. Masters Thesis, Texas State University – San Marcos. Accessed March 06, 2021. https://digital.library.txstate.edu/handle/10877/4008.

MLA Handbook (7^th Edition):

Dunn, Joel H. “Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers.” 2006. Web. 06 Mar 2021.

Vancouver:

Dunn JH. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. [Internet] [Masters thesis]. Texas State University – San Marcos; 2006. [cited 2021 Mar 06]. Available from: https://digital.library.txstate.edu/handle/10877/4008.

Council of Science Editors:

Dunn JH. Magnetoelastic Characterization and Domain Analysis of Magnetic Thin Films and Multilayers. [Masters Thesis]. Texas State University – San Marcos; 2006. Available from: https://digital.library.txstate.edu/handle/10877/4008

19. Παππάς, Σπυρίδων. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.

Degree: 2013, University of Patras

URL: http://hdl.handle.net/10889/6374

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Το αντικείμενο της παρούσας Διδακτορικής Διατριβής είναι η ανάπτυξη και ο χαρακτηρισμός προηγμένων υλικών για εφαρμογές σε νανοδιατάξεις. Στα πλαίσια αυτής, επικεντρωθήκαμε στην ανάπτυξη και… (more)

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Το αντικείμενο της παρούσας Διδακτορικής Διατριβής είναι η ανάπτυξη και ο χαρακτηρισμός προηγμένων υλικών για εφαρμογές σε νανοδιατάξεις. Στα πλαίσια αυτής, επικεντρωθήκαμε στην ανάπτυξη και μελέτη μαγνητικών και ημιαγωγικών λεπτών υμενίων που βασίζονται σε οξείδια παραδοσιακών μετάλλων και ημιαγωγών. Ο μαγνητικός και οπτικός χαρακτηρισμός των υλικών αυτών υπό τη μορφή της νανοδομής του λεπτού υμενίου, αποκαλύπτουν νέες ιδιότητες με εξαιρετικά μεγάλο τεχνολογικό ενδιαφέρον. Πιο συγκεκριμένα, έγινε καταρχήν ανάπτυξη πολυστρωματικών μαγνητικών υμενίων Ni/NiO, μονοστρωματικών ημιαγωγικών υμενίων Cu2O, CuO και NiO, όπως επίσης και μονοστρωματικών άμορφων μονωτικών υμενίων SiOx με ή και χωρίς ενσωματωμένες κβαντικές τελείες Si. Για κάθε σειρά υμενίων από τις κατηγορίες αυτές, έγινε μελέτη των μαγνητικών ή/και των οπτικών τους ιδιοτήτων. Τα υμένια Ni/NiO αναπτύχθηκαν σε διαφορετικά υποστρώματα με τη χρήση μιας μόνο κεφαλής magnetron sputtering και της μεθόδου της φυσικής οξείδωσης. Η διαστρωμάτωση του υλικού και η επαναληψιμότητα της μεθόδου αποδείχθηκαν εξαιρετικής ποιότητας. Για υμένια Ni/NiO με διαφορετικό πάχος στρώματος Ni έγινε εκτεταμένη μελέτη της εξάρτησης της μαγνήτισης και της ανισοτροπίας από τη θερμοκρασία. Βρέθηκε ότι τα υμένια με λεπτά στρώματα Ni εμφανίζουν τάση για κάθετη μαγνητική ανισοτροπία, η οποία προέρχεται από την υπολογίσιμη θετική ανισοτροπία επιφανείας που επιδεικνύουν αυτά. Τα ημιαγωγικά υμένια οξειδίων του Cu και του Νi αναπτύχθηκαν μετά από οξείδωση υμενίων των αντίστοιχων μεταβατικών μετάλλων. Τα άμορφα μονωτικά υμένια SiOx αναπτύχθηκαν με τη τεχνική της “reactive” ιοντοβολής. Στη συνέχεια, μέρος αυτών οξειδώθηκε πλήρως μετά από θέρμανση σε θερμοκρασία 950 οC και σε περιβάλλον αέρα, ενώ κάποια άλλα υποβλήθηκαν σε θερμική αποσύνθεση μετά από θέρμανση σε συνθήκες κενού στους 1000 οC. Με τη διαδικασία της θερμικής αποσύνθεσης, όπως αποδεικνύουν και οι εικόνες ηλεκτρονικής μικροσκοπίας, σχηματίζονται νανοκρύσταλλοι Si ενσωματωμένοι σε άμορφη μήτρα οξειδίου του Si. Για τα υμένια των οξειδίων του Cu και του Ni μελετήθηκαν με τη χρήση της φασματοσκοπίας UV-VIS τα φαινόμενα κβαντικού περιορισμού που παρουσιάζουν αυτά. Βρέθηκε ότι σε κάθε περίπτωση εμφανίζεται μετατόπιση της ακμής απορρόφησης προς μεγαλύτερες ενέργειες, καθώς το πάχος του υμενίου μειώνεται και γίνεται συγκρίσιμο με την εξιτονική ακτίνα Bohr του αντίστοιχου υλικού. Τα υμένια SiOx βρέθηκε ότι μετά από τη διαδικασία της θερμικής τους αποσύνθεσης παρουσιάζουν φωτοφωταύγεια, η οποία προέρχεται από τις εξιτονικές επανασυνδέσεις στις κβαντικές τελείες Si που εμπεριέχονται σ’ αυτά. Από την εργασία στα πλαίσια αυτής της Διατριβής, διαπιστώνουμε ότι μπορούμε να μεταβάλλουμε τις ιδιότητες παραδοσιακών υλικών, όπως είναι για παράδειγμα τα μέταλλα, οι κλασσικοί ημιαγωγοί και τα οξείδια αυτών, όταν αυτά αναπτύσσονται υπό τη μορφή νανοδομών. Οι νανοδομές αυτές μπορεί να εμφανίζουν εξαιρετικό ενδιαφέρον για εφαρμογές σε νανοδιατάξεις με καινούργιες αλλά κι εντελώς ελεγχόμενες ιδιότητες.

The objective of this Thesis is the growth and the…

Advisors/Committee Members: Πολίτης, Κωνσταντίνος, Pappas, Spyridon, Βελγάκης, Μιχαήλ, Hjorvarsson, Bjorgvin, Λιανός, Παναγιώτης, Πουλόπουλος, Παναγιώτης, Σκαρλάτος, Δημήτριος, Χαριτάντης, Ιωάννης, Πολίτης, Κωνσταντίνος.

Subjects/Keywords: Νανοδιατάξεις; Προηγμένα υλικά; Λεπτά υμένια; Μαγνητικά υλικά; Ημιαγωγικά υλικά; Φωτοφωταύγεια; Πολυστρωματικά υμένια; Οξείδιο του χαλκού; Οξείδιο του νικελίου; Κβαντικές κηλίδες; Πυρίτιο; 620.115; Nanodevices; Advanced materials; Thin films; Magnetic materials; Semiconducting materials; Photoluminescence; Multilayers; Copper oxide; Nickel oxide; Quantum dots; Silicon

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

APA (6^th Edition):

Παππάς, �. (2013). Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. (Doctoral Dissertation). University of Patras. Retrieved from http://hdl.handle.net/10889/6374

Chicago Manual of Style (16^th Edition):

Παππάς, Σπυρίδων. “Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.” 2013. Doctoral Dissertation, University of Patras. Accessed March 06, 2021. http://hdl.handle.net/10889/6374.

MLA Handbook (7^th Edition):

Παππάς, Σπυρίδων. “Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.” 2013. Web. 06 Mar 2021.

Vancouver:

Παππάς �. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. [Internet] [Doctoral dissertation]. University of Patras; 2013. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10889/6374.

Council of Science Editors:

Παππάς �. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. [Doctoral Dissertation]. University of Patras; 2013. Available from: http://hdl.handle.net/10889/6374

Pontifical Catholic University of Rio de Janeiro

20. ANTONIO CESAR DE OLIVEIRA PITTA BOTELHO. [en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES.

Degree: 2019, Pontifical Catholic University of Rio de Janeiro

URL: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37862

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[pt] Sensores capazes de detectar campos magnéticos são largamente aplicados nas mais variadas áreas da engenharia. Um magnetômetro é um dispositivo que, baseado na utilização… (more)

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[pt] Sensores capazes de detectar campos magnéticos são largamente aplicados nas mais variadas áreas da engenharia. Um magnetômetro é um dispositivo que, baseado na utilização de um sensor magnético, é capaz de medir a magnitude e/ou direção de um campo magnético. Magnetômetros GMI são transdutores magnéticos cujos elementos sensores se baseiam no efeito da Magnetoimpedância Gigante (Giant Magnetoimpedance - GMI) que se caracteriza pela grande variação da impedância (módulo e fase) de uma amostra de material ferromagnético quando submetida a um campo magnético externo. A sensibilidade dos transdutores magnéticos está diretamente associada à sensibilidade de seus elementos sensores. No caso de amostras GMI, a sensibilidade é afetada por diversos parâmetros, e essa dependência ainda não é bem modelada quantitativamente. Esta dissertação apresenta um modelo computacional baseado em Redes Neurais MLP e em Algoritmos Genéticos que determina a sensibilidade ótima da fase da impedância do efeito GMI em função do campo magnético externo, para ligas ferromagnéticas amorfas de composição Co70 Fe5 Si15 B10, a partir dos seguintes parâmetros que as afetam: comprimento das amostras, nível CC e frequência da corrente de excitação além do campo magnético externo.

[en] Sensors capable of detecting magnetic fields are widely applied in many areas of engineering. A magnetometer is a device that based on the use of a magnetic sensor is capable of measuring the magnitude and direction of a magnetic field. Magnetometers GMI are magnetic transducers which sensors elements are based on the Giant Magnetoimpedance effect (Giant Magnetoimpedance - GMI) that is characterized by large variation of the impedance (magnitude and phase) of a sample of ferromagnetic material when subjected to an external magnetic field. The magnetic transducers sensitivity is directly affected by the sensitivity of its sensor elements. In the case of GMI samples, the sensitivity is affected by several parameters, and this dependence is not well modeled quantitatively. This dissertation presents a computational model based on feedforward Multilayer Perceptron Neural Networks and Genetic Algorithms that determines the optimal impedance phase sensitivity of the GMI effect, as functions of the magnetic field, for Co70 Fe5 Si15 B10 ferromagnetic amorphous alloys, The proposed model is based on some of the main parameters that affect it: length of the samples, DC level and frequency of the excitation current and the external magnetic field.

Advisors/Committee Members: MARLEY MARIA BERNARDES REBUZZI VELLASCO.

Subjects/Keywords: [pt] REDES NEURAIS ARTIFICIAIS; [en] ARTIFICIAL NEURAL NETWORKS; [pt] MAGNETOIMPEDANCIA GIGANTE; [en] GIANT MAGNETOIMPEDANCE; [pt] FASE DA IMPEDANCIA; [en] IMPEDANCE PHASE; [pt] ALGORITMOS GENETICOS; [en] GENETIC ALGORITHMS; [pt] SENSOR MAGNETICO; [en] MAGNETIC SENSOR; [pt] PERCEPTRON MULTICAMADAS; [en] PERCEPTRON MULTILAYERS

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

APA (6^th Edition):

BOTELHO, A. C. D. O. P. (2019). [en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES. (Thesis). Pontifical Catholic University of Rio de Janeiro. Retrieved from http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37862

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):

BOTELHO, ANTONIO CESAR DE OLIVEIRA PITTA. “[en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES.” 2019. Thesis, Pontifical Catholic University of Rio de Janeiro. Accessed March 06, 2021. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37862.

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

MLA Handbook (7^th Edition):

BOTELHO, ANTONIO CESAR DE OLIVEIRA PITTA. “[en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES.” 2019. Web. 06 Mar 2021.

Vancouver:

BOTELHO ACDOP. [en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES. [Internet] [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. [cited 2021 Mar 06]. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37862.

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

Council of Science Editors:

BOTELHO ACDOP. [en] INTELLIGENT OPTIMIZATION MODEL FOR SENSITIVITY OF GMI SAMPLES. [Thesis]. Pontifical Catholic University of Rio de Janeiro; 2019. Available from: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=37862

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

21. XU YANJUN. SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS.

Degree: 2018, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/151217

Subjects/Keywords: spin current; spin-orbit torque; magnetic multilayers; magnetization switching; spin-Hall magnetoresistance sensor; AC excitation

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

APA (6^th Edition):

YANJUN, X. (2018). SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/151217

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):

YANJUN, XU. “SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS.” 2018. Thesis, National University of Singapore. Accessed March 06, 2021. http://scholarbank.nus.edu.sg/handle/10635/151217.

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

MLA Handbook (7^th Edition):

YANJUN, XU. “SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS.” 2018. Web. 06 Mar 2021.

Vancouver:

YANJUN X. SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS. [Internet] [Thesis]. National University of Singapore; 2018. [cited 2021 Mar 06]. Available from: http://scholarbank.nus.edu.sg/handle/10635/151217.

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

Council of Science Editors:

YANJUN X. SPIN-ORBIT TORQUE IN MAGNETIC MULTILAYERS AND ITS DEVICE APPLICATIONS. [Thesis]. National University of Singapore; 2018. Available from: http://scholarbank.nus.edu.sg/handle/10635/151217

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

22. Yuan, Yanyan. Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous.

Degree: Docteur es, Chimie Physique et Chimie Analytique, 2014, Université Pierre et Marie Curie – Paris VI

URL: http://www.theses.fr/2014PA066444

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Dans ce travail, nous nous concentrons sur la caractérisation de l'environnement physico-chimique des éléments présents dans des multicouches à base de cobalt qui travaillent dans… (more)

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Dans ce travail, nous nous concentrons sur la caractérisation de l'environnement physico-chimique des éléments présents dans des multicouches à base de cobalt qui travaillent dans les domaines des rayons X mous et extrême ultra-violet (EUV). L'observation des modifications des interface des deux systèmes Co/Mo2C et Co/Mo2C/Y lors du recuit est important pour l'amélioration de leurs performance optique. Ils ont été étudiés en combinant des méthodes non destructives, spectroscopie d'émission des rayons X, résonance magnétique nucléaire, réflectométrie de rayons X et des méthodes destructrices, spectrrométrie de masse d'ions secondaires par temps de vol et la Microscopie électronique en transmission pour étudier leurs propriétés interfaciales. Ce travail vise non seulement à la conception et la fabrication de nouveaux éléments optiques pour faire face au développement des sources et des applications dans les demaines des rayons X mous et l'EUV, mais aussi à développer une méthodologie combinant des simulations et des expérimentations consacrée à l'analyse des interfaces dans structures multicouches afin d'améliorer leur propriétés optiques.

In this work, we focus on the characterization of physico-chemical environment of the element present in Co-based multilayers working in the soft x-ray and EUV ranges. The observation of interface changes of both systems Co/Mo2C and Co/Mo2C/Y upon annealing is important for improving their optical performance. They were studied by combining non-destructive methods, x-ray emission spectroscopy, nuclear magnetic resonance spectroscopy, x-ray reflectometry and destructive methods, time-of-flight secondary ions mass spectroscopy and transmission electron microscopy to investigate their interface properties. This work aims not only at designing and fabricating new optical elements to face the development of sources and applications in the EUV and soft x-ray ranges, but also at developing a methodology combining simulations and experiments devoted to the interface analysis in these multilayer structures in order to improve their optical properties.

Advisors/Committee Members: Jonnard, Philippe (thesis director).

Subjects/Keywords: Multicouches à base de cobalt; Optique des rayons X et extrême ultraviolet; Spectroscopie d'emission X (XES); Interfaces; Spectroscopie de résonance magnétique nucléaire; Microscopie électronique en transmission; Nuclear magnetic resonance spectroscopy; Co-based multilayers; 541.3

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

APA (6^th Edition):

Yuan, Y. (2014). Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2014PA066444

Chicago Manual of Style (16^th Edition):

Yuan, Yanyan. “Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous.” 2014. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed March 06, 2021. http://www.theses.fr/2014PA066444.

MLA Handbook (7^th Edition):

Yuan, Yanyan. “Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous.” 2014. Web. 06 Mar 2021.

Vancouver:

Yuan Y. Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. [cited 2021 Mar 06]. Available from: http://www.theses.fr/2014PA066444.

Council of Science Editors:

Yuan Y. Characterization of physico-chemical environment of Co-based multilayer mirrors working in the soft x-ray and EUV ranges : Caractérisation de l’environnement physico-chimique de miroirs multicouches à base de cobalt travaillant dans les domaines de l’extrême ultraviolet et des rayons X mous. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. Available from: http://www.theses.fr/2014PA066444

Brno University of Technology

23. Uhlíř, Vojtěch. Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/697

► This thesis deals with the study of current-induced magnetization dynamics and domain wall (DW) motion in NiFe/Cu/Co nanowires, induced by the so-called spin-transfer torque effect.… (more)

▼ This thesis deals with the study of current-induced magnetization dynamics and domain wall (DW) motion in NiFe/Cu/Co nanowires, induced by the so-called spin-transfer torque effect. Prior to this work, transport measurements had proven that in this trilayer system, DWs in NiFe can be moved with relatively low current densities, suggesting a particularly high spin-torque efficiency. The aim of this study has been to use photoemission electron microscopy combined with x-ray magnetic circular dichroism at synchrotron radiation sources to observe directly the magnetic configurations in the trilayers and their evolution during and after the application of nanosecond current pulses. An important step of the work has been to optimize the growth of the NiFe/Cu/Co layers, in the view of increasing interface quality and minimize interlayer coupling. The process of nanowire patterning by e-beam lithography has also been optimized. Two kinds of measurements have been carried out: i) quasi static measurements, where the domain configuration is observed before and after the application of current pulses and ii) dynamic measurements, where the magnetic configuration has been observed during the application of current pulses. The first measurements have allowed us to study the statistical behaviour of DWs under the application of current pulses: on one hand, the domain wall velocities reach extremely high values for relatively low current densities (up to 600 m/s for 5x10¹¹ A/m²). On the other hand, DW motion over distances larger than 2-3 microns is strongly hindered by pinning. Time-resolved measurements during the current pulses, carried out for the first time by our team, have allowed us to demonstrate that the NiFe magnetization is strongly tilted in the direction transverse to the nanowire direction, due to the presence of a transverse Oersted field. This effect might contribute to the enhancement of DW velocities in the NiFe layers. Advisors/Committee Members: Šikola, Tomáš (advisor), Thiaville, André (referee), Ravelosona, Dafiné (referee).

Subjects/Keywords: přenos spinového momentu; doménová stěna; dynamika magnetizace; magnetické nanodráty; pohyb doménové stěny vyvolaný elektrickým proudem; spinový ventil; spin-transfer torque; domain wall; magnetization dynamics; \\magnetic nanowires; current-induced domain wall motion; spin-valve multilayers

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

APA (6^th Edition):

Uhlíř, V. (2019). Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/697

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):

Uhlíř, Vojtěch. “Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures.” 2019. Thesis, Brno University of Technology. Accessed March 06, 2021. http://hdl.handle.net/11012/697.

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

MLA Handbook (7^th Edition):

Uhlíř, Vojtěch. “Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures.” 2019. Web. 06 Mar 2021.

Vancouver:

Uhlíř V. Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/11012/697.

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

Council of Science Editors:

Uhlíř V. Current Induced Magnetization Dynamics in Nanostructures: Current Induced Magnetization Dynamics in Nanostructures. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/697

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

Kyoto University

24. Ham, Woo Seung. Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers .

Degree: 2019, Kyoto University

URL: http://hdl.handle.net/2433/242636

Subjects/Keywords: Spin orbit torque; magnetic multilayers; interfacial-spin orbit coupling; superlattice; Dzyaloshinksii-Moriya interaction; inversion symmetry breaking

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APA (6^th Edition):

Ham, W. S. (2019). Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers . (Thesis). Kyoto University. Retrieved from http://hdl.handle.net/2433/242636

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):

Ham, Woo Seung. “Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers .” 2019. Thesis, Kyoto University. Accessed March 06, 2021. http://hdl.handle.net/2433/242636.

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

MLA Handbook (7^th Edition):

Ham, Woo Seung. “Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers .” 2019. Web. 06 Mar 2021.

Vancouver:

Ham WS. Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers . [Internet] [Thesis]. Kyoto University; 2019. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2433/242636.

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

Council of Science Editors:

Ham WS. Spin-orbit Phenomena in Non-centrosymmetric Magnetic Multilayers . [Thesis]. Kyoto University; 2019. Available from: http://hdl.handle.net/2433/242636

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

25. Pappas, Spyridon. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.

Degree: 2013, University of Patras; Πανεπιστήμιο Πατρών

URL: http://hdl.handle.net/10442/hedi/29050

►

The objective of this Thesis is the growth and the characterization of high tech materials which can be possible candidates for future applications in nanodevices.… (more)

▼

The objective of this Thesis is the growth and the characterization of high tech materials which can be possible candidates for future applications in nanodevices. In the framework of the Thesis, we were mainly focused on the production and the study of magnetic and semiconducting thin films, which are based on oxides of metals and of conventional semiconductors. The magnetic and optical characterizations reveal that these materials, in the form of thin films exhibit new properties with exceptionally large technological interest. In more detail, magnetic Ni/NiO multilayers, semiconducting Cu2O, CuO and NiO thin films, as well as insulating amorphous SiOx thin films with or without embedded Si quantum dots, were produced. The magnetic and/or optical properties of each of the aforementioned thin film categories were studied and their impact on possible future applications was examined. The Ni/NiO multilayers were produced on various substrates with the aid of a single magnetron sputtering head and the natural oxidation process. The produced multilayers were of excellent layering and interface quality. An extended study of both the magnetization and the anisotropy as a function of the temperature and the varying Ni layer thickness was performed. It is found from the magnetic investigations, that the multilayers with thin Ni layers exhibit a trend for perpendicular magnetic anisotropy, which is attributed to the considerable positive surface anisotropy of the Ni/NiO interfaces. The semiconducting copper and nickel oxide thin films were produced via the oxidation of the corresponding metallic films. The amorphous SiOx films were fabricated via the reactive sputtering method. Part of the as deposited films was fully oxidized at 950 °C under the ambient air environment, whereas another part was thermally decomposed under vacuum conditions at 1000 °C. Electron microscopy investigations reveal that upon the thermal decomposition process of the films, embedded Si nanocrystals are formed in the amorphous matrix of the Si oxide. The Cu and Ni oxide films exhibited quantum confinement effects, which were studied via the UV-VIS spectroscopy. The recorded spectra reveal that the absorption edge shifts towards higher energies, as the layer thickness is reduced and becomes comparable with the excitonic Bohr radius of the material. The Si oxide thin films, after the thermal decomposition treatment are found to exhibit photoluminescence at the region between 1.3 and 1.5 eV which is originated to the excitonic recombination in the embedded Si quantum dots. Finally, it is deduced that conventional materials like metals, semiconductors and the oxides of them, can exhibit new properties when they are prepared in the form of nanostructure. These nanostructures can attract a lot of interest for possible applications in nanodevices with new but completely controllable properties.

Το αντικείμενο της παρούσας Διδακτορικής Διατριβής είναι η ανάπτυξη και ο χαρακτηρισμός προηγμένων υλικών για εφαρμογές σε νανοδιατάξεις. Στα πλαίσια αυτής,…

Subjects/Keywords: Νανοδιατάξεις; Προηγμένα υλικά; Λεπτά υμένια; Μαγνητικά υλικά; Ημιαγωγικά υλικά; Φωτοφωταύγεια; Πολυστρωματικά υμένια; Οξείδιο του χαλκού; Οξείδιο του νικέλιου; Κβαντικές κηλίδες; Πυρίτιο; Nanodevices; Advanced materials; Thin films; Magnetic materials; Semiconducting materials; Photoluminescence; Multilayers; Copper oxide; Nickel oxide; Quantum dots; Silicon

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APA (6^th Edition):

Pappas, S. (2013). Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. (Thesis). University of Patras; Πανεπιστήμιο Πατρών. Retrieved from http://hdl.handle.net/10442/hedi/29050

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):

Pappas, Spyridon. “Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.” 2013. Thesis, University of Patras; Πανεπιστήμιο Πατρών. Accessed March 06, 2021. http://hdl.handle.net/10442/hedi/29050.

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

MLA Handbook (7^th Edition):

Pappas, Spyridon. “Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις.” 2013. Web. 06 Mar 2021.

Vancouver:

Pappas S. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. [Internet] [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2013. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10442/hedi/29050.

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

Council of Science Editors:

Pappas S. Ανάπτυξη και χαρακτηρισμός προηγμένων υλικών για νανοδιατάξεις. [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2013. Available from: http://hdl.handle.net/10442/hedi/29050

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

26. Kryukov, Sergiy A. MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS.

Degree: 2012, University of Kentucky

URL: https://uknowledge.uky.edu/physastron_etds/7

► Magnetic properties of Nb/Ni superconducting (SC) / ferromagnetic (FM) multilayers exhibit interesting properties near and below SC transition. A complex Field (H) – Temperature (T)… (more)

▼ Magnetic properties of Nb/Ni superconducting (SC) / ferromagnetic (FM) multilayers exhibit interesting properties near and below SC transition. A complex Field (H) – Temperature (T) phase boundary is observed in perpendicular and parallel orientation of ML with respect to DC field. We address the critical need to develop methods to make reliable magnetic measurements on SC thin films and ML, in spite of their extreme shape anisotropy and the strong diamagnetic response of the SC state. Abrupt, highly reproducible “switching” of the SC state magnetization near the normal-state FM coercive fields has been observed in Nb/Ni ML. The SC penetration depth l(Nb) > the SC coherence length xo(Nb) » 40 nm >> the FM layer thickness y(Ni) = 5 nm, abrupt magnetic reversals might be driven by strong supercurrent densities (J x M torques) that have the potential to flow into the Ni layers. Alternatively, sharp magnetization anomalies also can result from strong flux pinning by the periodic layered structure of ML, including “lock-in” of quantized flux lines (FL) parallel to the ML plane. Strong confinement of the supercurrents within ML planes might also lead to various phase transitions of the FL lattice (FLL) composed of one-dimensional chains and other unusual structures. Possible mechanisms for the switching anomalies must be evaluated while considering other experimental properties of Nb(x)/Ni(y) ML: 1) The upper critical magnetic field Hc2(T) exhibits a highly unusual anisotropy where the SC transition temperature Tc (H®0) for DC field H ^ ML plane exceeds the value for H || ML by ~ 0.5 K. 2) Nb/Ni ML samples do not consistently exhibit magnetic signatures for the onset of superconductivity, depending on the details of the sample mounting procedure and the AC or DC method used in SQUID magnetometry experiments. 3) Unusual “wiggles” or oscillations of order 10-30 mK were observed in Hc2(T) in AC SQUID experiments with H || ML and can be even larger (~0.16 K), depending upon the AC drive amplitude ho and frequency f .

Subjects/Keywords: Superconductivity; Multilayers; Magnetic Pair Braking; Superconducting Proximity Effect; Triplet Superconductivity; Condensed Matter Physics

…59 3.1. Nb/Ni Multilayers…

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APA (6^th Edition):

Kryukov, S. A. (2012). MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/physastron_etds/7

Chicago Manual of Style (16^th Edition):

Kryukov, Sergiy A. “MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS.” 2012. Doctoral Dissertation, University of Kentucky. Accessed March 06, 2021. https://uknowledge.uky.edu/physastron_etds/7.

MLA Handbook (7^th Edition):

Kryukov, Sergiy A. “MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS.” 2012. Web. 06 Mar 2021.

Vancouver:

Kryukov SA. MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS. [Internet] [Doctoral dissertation]. University of Kentucky; 2012. [cited 2021 Mar 06]. Available from: https://uknowledge.uky.edu/physastron_etds/7.

Council of Science Editors:

Kryukov SA. MAGNETIC PROPERTIES OF Nb/Ni SUPERCONDUCTING / FERROMAGNETIC MULTILAYERS. [Doctoral Dissertation]. University of Kentucky; 2012. Available from: https://uknowledge.uky.edu/physastron_etds/7

27. Wei, Zhen. Spin-transfer-torque effect in ferromagnets and antiferromagnets.

Degree: PhD, Physics, 2008, University of Texas – Austin

URL: http://hdl.handle.net/2152/7524

► Spintronics in metallic multilayers, composed of ferromagnetic (F) and non-magnetic (N) metals, grew out of two complementary discoveries. The first, Giant Magnetoresistance (GMR), refers to… (more)

▼ Spintronics in metallic multilayers, composed of ferromagnetic (F) and non-magnetic (N) metals, grew out of two complementary discoveries. The first, Giant Magnetoresistance (GMR), refers to a change in multilayer resistance when the relative orientation of magnetic moments in adjacent F-layers is altered by an applied magnetic field. The second, Spin-Transfer-Torque (STT), involves a change in the relative orientation of F-layer moments by an electrical current. This novel physical phenomenon offers unprecedented spatial and temporal control over the magnetic state of a ferromagnet and has tremendous potential in a broad range of technologies, including magnetic memory and recording. Because of its small size (<10nm), point contact is a very efficient probe of electrical transport properties in extremely small sample volumes yet inaccessible with other techniques. We have observed the point-contact excitations in magnetic multilayers at room temperature and extended the capabilities of our point-contact technique to include the sensitivity to wavelengths of the current-induced spin waves. Recently MacDonald and coworkers have predicted that similar to ferromagnetic multilayers, the magnetic state of an antiferromagnetic (AFM) system can affect its transport properties and result in antiferromagnetic analogue of giant magnetoresistance (GMR) = AGMR; while high enough electrical current density can affect the magnetic state of the system via spin-transfer-torque effect. We show that a high density dc current injected from a point contact into an exchange-biased spin valve (EBSV) can systematically change the exchange bias, increasing or decreasing it depending on the current direction. This is the first evidence for current-induced effects on magnetic moments in antiferromagnetic (FeMn or IrMn) metals. We searched for AGMR in multilayers containing different combinations of AFM=FeMn and F=CoFe layers. At low currents, no magnetoresistance (MR) was observed in any samples suggesting that no AGMR is present in these samples. In samples containing F-layers, high current densities sometimes produced a small positive MR – largest resistance at high fields. For a given contact resistance, this MR was usually larger for thicker F-layers, and for a given current, it was usually larger for larger contact resistances (smaller contacts). We tentatively attribute this positive MR to suppression at high currents of spin accumulation induced around and within the F-layers. Advisors/Committee Members: Tsoi, Maxim (advisor).

Subjects/Keywords: Spintronics; Metalic multilayers; Ferromagnetic metals; Non-magnetic metals; Giant Magnetoresistance; Spin-Transfer-Torque; Point-contact

…70 3.5 Microwave Generation and Detection in Magnetic Multilayers ....... 79 3.6 3.5.1… …magnetic multilayers. ................................................................. 67 Figure… …3.6: Low field spin transfer phenomena in magnetic multilayers........... 69 Figure 3.7… …Resistance dependent measurements of current induced spin wave excitations in magnetic multilayers… …Physics. The main observation in these multilayers was that with a magnetic field aligning the…

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

APA (6^th Edition):

Wei, Z. (2008). Spin-transfer-torque effect in ferromagnets and antiferromagnets. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/7524

Chicago Manual of Style (16^th Edition):

Wei, Zhen. “Spin-transfer-torque effect in ferromagnets and antiferromagnets.” 2008. Doctoral Dissertation, University of Texas – Austin. Accessed March 06, 2021. http://hdl.handle.net/2152/7524.

MLA Handbook (7^th Edition):

Wei, Zhen. “Spin-transfer-torque effect in ferromagnets and antiferromagnets.” 2008. Web. 06 Mar 2021.

Vancouver:

Wei Z. Spin-transfer-torque effect in ferromagnets and antiferromagnets. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2008. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/2152/7524.

Council of Science Editors:

Wei Z. Spin-transfer-torque effect in ferromagnets and antiferromagnets. [Doctoral Dissertation]. University of Texas – Austin; 2008. Available from: http://hdl.handle.net/2152/7524

Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

28. Παπαϊωάννου, Ευάγγελος. Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων.

Degree: 2006, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

URL: http://hdl.handle.net/10442/hedi/15321

► A combined structural, magnetic, magneto?optic and magnetotransport study of magnetic nanocomposite materials in the form of multilayers was carried out in the framework of the… (more)

▼ A combined structural, magnetic, magneto?optic and magnetotransport study of magnetic nanocomposite materials in the form of multilayers was carried out in the framework of the current Doctorate Thesis. The main objective was to get a detailed and systematic knowledge of the properties of the nanostructures that arise from the combination of the 3d magnetic metals with the 5d non?magnetic metals. More specifically, the magnetic elements Co & Ni were combined with the metals Pt, Au & Cr. Systems such as Ni/Pt, Co/Pt, Co/Au, CoCr/Pt were synthesized. From the aspect of physics, the goal of this work was the growth and characterisation of those novel magnetic materials, in order to clarify the mechanisms that determine their magnetic properties. Apart from the importance that these structures present due to the appearance of new phenomena from the view of basic physics, these materials may constitute some good candidates for future materials that concern the prosperous technology of magnetic and magnetooptic recording as well as the technology based on the phenomenon of giant magnetoresistance. The magnetic multilayers were grown in an ultra high vacuum chamber. The method of the synthesis was the evaporation with the use of electron beam. Moreover, patterned substrates made by the lithography technique were used, so as to be appropriate for the fabrication of patterned nanostructures. In particular, the Ni/Pt system represented the model system for the study of the behavior of the 3d/5d nanostructures. It showed excellent multilayer configuration with negligible interdiffusion. The influence of the substrate on the growth mode was examined. The magnetic features of the materials were studied toward to the growth parameters, while most of the samples showed a tendency for perpendicular magnetic anisotropy. This system also constituted the starting point for the whole study of the magnetooptic phenomenon and its dependence from various parameters. The fabrication of the Co/Au system proved to be successful regarding to the quality of its multilayer structure, since the relevant studies marked out almost square texture profiles. This system showed a tendency for perpendicular anisotropy depending on the decrease of the thickness of the Co layers and on the increase of the thickness of the Au layers. The appearance of enhanced magnetooptic response at about 3 eV led to the investigation of the spin?orbit coupling of the Au atoms. Measurements by the XMCD method (x?ray magnetic circular dichroism) demonstrated that Au presents an induced magnetic moment. Such phenomenon for Au has not been published until now elsewhere. Another object of the research of the multilayers was to examine their behavior approaching their natural limit, which is the monolayer. For this purpose the Co/Pt system was used. The result was strong perpendicular anisotropy and a very large value of the magnetooptic response mainly for samples with only one or two Co atomic layers. The synthesized samples are suggested for future magnetooptic recording…

Subjects/Keywords: Μαγνητικές νανοδομές; Πολυστρωματικά υμένια; Ειδικά διαμορφωμένα μέσα; Μαγνητοοπτικό φαινόμενο; Μαγνητική υστέρηση; Γιγαντιαία μαγνητοαντίσταση; Μαγνητικά μέσα αποθήκευσης; Μαγνητικός κυκλικός διχρωϊσμός ακτίνων Χ; Magnetic nanostructures; Magnetic multilayers; Patterned media; Magneto-optical effect; Magnetic hysteresis; Giant magnetoresistance (GMR); Magnetic recording media; Magnetic circular dichroism X rays (XMCD)

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APA (6^th Edition):

Παπαϊωάννου, . �. (2006). Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/15321

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):

Παπαϊωάννου, Ευάγγελος. “Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων.” 2006. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed March 06, 2021. http://hdl.handle.net/10442/hedi/15321.

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

MLA Handbook (7^th Edition):

Παπαϊωάννου, Ευάγγελος. “Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων.” 2006. Web. 06 Mar 2021.

Vancouver:

Παπαϊωάννου �. Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2006. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10442/hedi/15321.

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

Council of Science Editors:

Παπαϊωάννου �. Συσχέτιση δομής και μαγνητισμού σε νέα μαγνητικά υλικά νανοδιαστάσεων. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2006. Available from: http://hdl.handle.net/10442/hedi/15321

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

Delft University of Technology

29. Khalili Amiri, P. Magnetic materials and devices for integrated radio-frequency electronics.

Degree: 2008, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1

Subjects/Keywords: radio-frequency integrated circuits; magnetic thin films; passive devices; transmission lines; microstrip; inductors; permeability; ferromagnetic resonance; shape-induced anisotropy; granular materials; reactive sputtering; electrical resistivity; spin waves; magnetostatic waves; nonreciprocity; magnetic multilayers

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

APA (6^th Edition):

Khalili Amiri, P. (2008). Magnetic materials and devices for integrated radio-frequency electronics. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1

Chicago Manual of Style (16^th Edition):

Khalili Amiri, P. “Magnetic materials and devices for integrated radio-frequency electronics.” 2008. Doctoral Dissertation, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1.

MLA Handbook (7^th Edition):

Khalili Amiri, P. “Magnetic materials and devices for integrated radio-frequency electronics.” 2008. Web. 06 Mar 2021.

Vancouver:

Khalili Amiri P. Magnetic materials and devices for integrated radio-frequency electronics. [Internet] [Doctoral dissertation]. Delft University of Technology; 2008. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1.

Council of Science Editors:

Khalili Amiri P. Magnetic materials and devices for integrated radio-frequency electronics. [Doctoral Dissertation]. Delft University of Technology; 2008. Available from: http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; urn:NBN:nl:ui:24-uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1 ; http://resolver.tudelft.nl/uuid:2d9d87dd-cb7c-4919-8fbb-595d9a8353f1

ETH Zürich

30. Hunziker, Michael. Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers.

Degree: 2000, ETH Zürich

URL: http://hdl.handle.net/20.500.11850/144657

Subjects/Keywords: MAGNETISCHE EIGENSCHAFTEN DÜNNER SCHICHTEN (PHYSIK VON MOLEKULARSYSTEMEN); MULTISCHICHTEN (PHYSIK VON MOLEKULARSYSTEMEN); MAGNETISCHE KOPPLUNG (MAGNETISMUS); MAGNETIC PROPERTIES OF THIN FILMS (PHYSICS OF MOLECULAR SYSTEMS); MULTILAYERS (PHYSICS OF MOLECULAR SYSTEMS); MAGNETIC COUPLING (MAGNETISM); info:eu-repo/classification/ddc/530; Physics

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Hunziker, M. (2000). Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/144657

Chicago Manual of Style (16^th Edition):

Hunziker, Michael. “Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers.” 2000. Doctoral Dissertation, ETH Zürich. Accessed March 06, 2021. http://hdl.handle.net/20.500.11850/144657.

MLA Handbook (7^th Edition):

Hunziker, Michael. “Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers.” 2000. Web. 06 Mar 2021.

Vancouver:

Hunziker M. Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers. [Internet] [Doctoral dissertation]. ETH Zürich; 2000. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/20.500.11850/144657.

Council of Science Editors:

Hunziker M. Molecular-orbital model of heat-induced effective exchange coupling in magnetic multilayers. [Doctoral Dissertation]. ETH Zürich; 2000. Available from: http://hdl.handle.net/20.500.11850/144657

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Open Access Theses and Dissertations