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You searched for +publisher:"University of Manchester" +contributor:("TUNA, FLORIANA F"). Showing records 1 – 2 of 2 total matches.

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University of Manchester

1. Ansbro, Simon Geoffrey. Molecular Nanomagnets Probed by Inelastic Neutron Scattering.

Degree: 2017, University of Manchester

Molecular nanomagnets have the potential to address many technological challenges whilst also giving insights into fundamental quantum behaviours. In order to accomplish this it is crucial that a determination of the magnetic properties of these nanoscopic objects is established. Inelastic neutron scattering (INS) is at the forefront of these investigations and is a technique capable of unravelling vast amounts of information that can enable a detailed understanding and tailoring of the properties of these molecules. This thesis demonstrates the application of this state-of-the-art technique to a number of different yet important nanomagnets in the field, pushing the technique to the limit to yield new insights into the underlying physics in these systems. The potential of this technique is finely displayed in the unravelling of the spin dynamics in a supramolecular (Cr7Ni)2 dimer, where the intermolecular entanglement is portrayed in the vast 4D phase space extracted. This work also harnesses the full power of the 4D-INS technique to resolve the long standing issue of the spin Hamiltonian in the archetypal single molecule magnet (SMM) Mn12, which after hundreds of papers since the realisation of its magnetic properties some 25 years ago had still not been convincingly settled. A little utilised avenue to building on Mn12 and generating better SMMs is also suggested and the evolution of the technique demonstrated by 8 characterising the magnetic properties in a tiny quantity of nanomagnet dimers. Advisors/Committee Members: TUNA, FLORIANA F, Winpenny, Richard, Tuna, Floriana.

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

APA (6th Edition):

Ansbro, S. G. (2017). Molecular Nanomagnets Probed by Inelastic Neutron Scattering. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:312306

Chicago Manual of Style (16th Edition):

Ansbro, Simon Geoffrey. “Molecular Nanomagnets Probed by Inelastic Neutron Scattering.” 2017. Doctoral Dissertation, University of Manchester. Accessed October 16, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:312306.

MLA Handbook (7th Edition):

Ansbro, Simon Geoffrey. “Molecular Nanomagnets Probed by Inelastic Neutron Scattering.” 2017. Web. 16 Oct 2019.

Vancouver:

Ansbro SG. Molecular Nanomagnets Probed by Inelastic Neutron Scattering. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2019 Oct 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:312306.

Council of Science Editors:

Ansbro SG. Molecular Nanomagnets Probed by Inelastic Neutron Scattering. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:312306


University of Manchester

2. Kostopoulos, Andreas. Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres.

Degree: 2018, University of Manchester

This thesis explores the use of bottom-up synthetic methods to make electronic spin based supramolecular systems and study their application in quantum computing. Incorporating such metal ions or clusters requires extensive knowledge of their magnetic properties since even small structural changes can have an observable effect in their magnetism, with differences in their axial and rhombic magnetic anisotropy, and their distance can be tailored to strengthen or weaken their interaction. The techniques used for the fundamental analysis of their magnetic properties include low and high-frequency Continuous Wave and Pulsed electron paramagnetic resonance (EPR) spectroscopy and SQUID magnetometry. The synthesis of a novel supramolecular assembly containing two functionalized {Cr7Ni} rings bridged by either a high spin lanthanide ion (Gd3+) or diamagnetic ion (Y3+) is introduced, along with an extensive characterisation of its electronic properties. Continuous Wave and Pulsed EPR measurements have allowed the determination of the sign and rhombicity of the anisotropy, the fine magnetic interaction between the components as well as the spin relaxation dynamics of the individual qubits. A series of reactions to create clusters of varying nuclearity and a new family of heterometallic {CrxMy} wheels (where M= Ti4+, Th4+, U4+/5+) are reported. The analysis of the magnetic measurements provides an overview of the changes in antiferromagnetic interaction between the Cr3+ depending on the capping heterometals. Finally, a new class of heterometallic wheels are presented that contain a single 3d transition metal in a diamagnetic circumference. For the Ti7M (where M= Fe3+, Cr3+) family, using the same wheel size but different counter cations, a correlation is drawn with the distortion on the Oh geometry of the paramagnetic ions and its effect on the transition metal’s anisotropy using CW EPR. For the Ga7M (M= Cu2+, Mn2+) wheels, CW EPR spectroscopy in powder samples and solutions are used to elucidate the electronic structure of the divalent metal and hyperfine interactions from coordinated fluorides. Advisors/Committee Members: LEIGH, DAVID DA, TUNA, FLORIANA F, Winpenny, Richard, Leigh, David, Tuna, Floriana.

Subjects/Keywords: Coordination Chemistry; Molecular Magnetism; Electron Paramagnetic Resonance; Quantum Information Processing; Heterometallic Wheels

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

APA (6th Edition):

Kostopoulos, A. (2018). Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315676

Chicago Manual of Style (16th Edition):

Kostopoulos, Andreas. “Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres.” 2018. Doctoral Dissertation, University of Manchester. Accessed October 16, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315676.

MLA Handbook (7th Edition):

Kostopoulos, Andreas. “Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres.” 2018. Web. 16 Oct 2019.

Vancouver:

Kostopoulos A. Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2019 Oct 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315676.

Council of Science Editors:

Kostopoulos A. Supramolecular arrays and clusters: from Cr7Ni to new Heterometallic Wheels containing spin centres. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:315676

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