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Dissertations / Theses on the topic 'Magnetism of matter'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Etzkorn, Stephen J. "Magnetic relaxation in organic-based magnets." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1044548603.

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Thesis (Ph. D)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 134 p. : ill. (some col.). Includes abstract and vita. Advisor: Arthur J. Epstein, Dept. of Physics. Includes bibliographical references (p. 128-134).
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2

Coaquira, José Antonio Huamaní. "Propriedades Magnéticas e Hiperfinas das Ligas Zr(FexCr1-x)2 e seus Hidretos." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-11032014-164100/.

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Investigamos as propriedades magnéticas e as interações hiperfinas das ligas \'ZR\'\'(\'FE IND. x\'\'CR IND. 1-x\') IND. 2\' (0.3 < x < 0.7) e seus hidretos, através de medidas de magnetização em campos até 9 T, suscetibilidade AC e espectroscopia Mossbauer. A difração de raios X confirmou a estrutura de fase de Laves hexagonal Cl4 para todas as amostras. Os espectros Mossbauer das ligas à temperatura ambiente apresentaram dois dubletos quadrupolares, que podiam ser atribuídos de duas maneiras aos sítios cristalográficos 2a e 6h do Fe. Esta ambigüidade foi resolvida por um cálculo de cargas p
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3

Martins, Cezar Soares. "Magnetização e Magnetoresistência Gigante em Ligas Granulares CuNiFe." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-02122013-185104/.

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Neste trabalho, estudamos as propriedades magnéticas e a magnetoresistência gigante (GMR) em fitas de Cu IND.80 Ni IND.20-xFe IND.x (x = 2,5 ; 5; 10; 17, 5; 20) produzidas por melt-spinning. As fitas foram estudadas como função da temperatura de tratamento térmico T IND.an 500°C, usando-se um magnetômetro SQUID. Uma grande variedade de estruturas granulares foram obtidas para diferentes razões de Ni/Fe e condições de tratamento térmico. Para Cu80 Ni10 Fe10, a magnetização não apresentou histerese mensurável para T 50K. Este comportamento é consistente com as curvas de susceptibilidade que in
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4

Tan, Zhiming Darren. "Frustrated magnetism in the extended kagome lattice." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:151fb421-198b-44b5-9f0d-8b35333f6450.

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The extended kagome lattice, composed of alternating kagome and triangular layers, provides a novel geometry for frustrated magnetism. In this thesis, we study the properties of Heisenberg spins with nearest-neighbour antiferromagnetic interactions on this lattice. In common with many other models of frustrated magnets, this system has highly degenerate classical ground states. It is set apart from other examples, however, by the strong interlayer correlations between triangular layer spins. We study the implications of such correlations in both the statics and dynamics. We characterise classi
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5

Steele, Andrew J. "Quantum magnetism probed with muon-spin relaxation." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:030d7e91-f38e-433f-9539-652b0f4996cc.

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This thesis presents the results of muon-spin relaxation (µ<sup>+</sup><abbr>SR</abbr>) studies into magnetic materials, and demonstrates how these results can be exploited to quantify the materials’ low moments and reduced dimensionality. Dipole-field simulations, traditionally used to estimate likely muon sites within a crystal structure, are described. A novel Bayesian approach is introduced which allows bounds to be extracted on magnetic moment sizes and magnetic structures—previously very difficult using µ<sup>+</sup><abbr>SR</abbr>—based on reasonable assumptions about positions in which
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6

Ghannadzadeh, Saman. "Investigating magnetism and superconductivity using high magnetic fields." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:4b78618e-89a3-424e-a673-59d363a2605d.

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This thesis investigates a number of transition-metal coordination polymers and iron-pnictide superconductors through the use of high magnetic fields, low temperatures, and on occasion, high pressures. The thesis will begin by describing my development of the proximity detector dynamic susceptometer, a novel technique that can be used for magnetometery and transport measurements in high magnetic fields. This technique is highly compact and has no moving parts, making it suitable for use in pressure cells, hence opening the way for a variety of new experiments. Through high-field magnetometery
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7

Berridge, Andrew McConnell. "Itinerant metamagnetism and magnetic inhomogeneity : a magnetic analogue of the superconducting Fulde-Ferrell-Larkin-Ovchinnikov phase in Sr₃Ru₂O₇." Thesis, University of St Andrews, 2009. http://hdl.handle.net/10023/821.

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The formation of magnetic order in solids is a complex and subtle issue. There are a wide range of different types of magnetisation, all of which may be favoured under different circumstances. In this thesis we consider a novel combination of ideas where the formation of spatially modulated magnetisation is linked to a metamagnetic transition. In this we are inspired by a general principle of modulated phases intervening as intermediate states in phase transitions. In particular we draw analogies with the Fulde-Ferrell-Larkin-Ovchinnikov state of spatially modulated superconductivity. We study
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8

Pike, Nicholas A. "Energy Dispersion, Magnetism, and Transport in Three Condensed Matter Systems." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417604062.

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9

Wang, Zhengjun. "Investigations into the nature of magnetism in transition-metal-phthalocyanines." Thesis, West Virginia University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10146559.

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<p> In this dissertation, the nature of magnetism in transition-metal-doped phthalocyanines (TMPc, TM = Co, Ni, Cu, V, and Mn, chemical formula: C<sub> 32</sub>H<sub>16</sub>N<sub>8</sub>TM) is investigated by measuring their magnetization (M) and ac susceptibilities in magnetic fields up to 90 kOe and covering the wide temperature range of 0.5 K to 300 K. These low temperatures and high magnetic field measurements combined with detailed analysis of the data have provided new information about the nature of magnetism of TMPc. The powder samples used here were structurally characterized using x
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10

Brollo, Maria Eugênia Fortes 1991. "Síntese e caracterização de nanopartículas magnéticas complexas." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276938.

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Orientador: Kleber Roberto Pirota<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-28T03:20:57Z (GMT). No. of bitstreams: 1 Brollo_MariaEugeniaFortes_M.pdf: 2851149 bytes, checksum: 47602eed8bc518fc96924d8adc494cfc (MD5) Previous issue date: 2015<br>Resumo: O interesse desta dissertação está em encontrar novos sistemas de nanopartículas, estudar suas propriedades estruturais e magnéticas, modificar as sínteses já conhecidas pela academia e tentar aplicar esses sistemas em uma técnica chamada hipertermia, u
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11

Gotsis, Harry John. "A first-principles theory of magneto-X-ray effects." Thesis, Keele University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240005.

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12

Morris, Richard. "Studies towards quantum magnonics." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:89784b64-de31-457f-b9b2-54125c862632.

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This thesis reports on recent results which pave the way for future experiments in the emerging field of quantum magnonics. Chapter 1 presents a brief outline of the field of magnonics, which provides the context in which quantum magnonics has begun to develop. Chapter 2 provides an introduction to the theory of spin waves, which is necessary to understand the experiments reported in the thesis. In Chapter 3, the experimental methods and materials used to carry out the investigations in the thesis are described. Chapter 4 describes the coupling of resonant magnon modes in a sphere of yttrium-i
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13

Bingham, Nicholas Steven. "Magnetism in Complex Oxides Probed by Magnetocaloric Effect and Transverse Susceptibility." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4440.

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Magnetic oxides exhibit rich complexity in their fundamental physical properties determined by the intricate interplay between structural, electronic and magnetic degrees of freedom. The common themes that are often present in these systems are the phase coexistence, strong magnetostructural coupling, and possible spin frustration induced by lattice geometry. While a complete understanding of the ground state magnetic properties and cooperative phenomena in this class of compounds is key to manipulating their functionality for applications, it remains among the most challenging problems facing
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14

Han, Shou. "Magnetism in multiferroics and low dimensional metal-organic complexes." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/23198.

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Multiferroics and magnetic metal-organic complexes are candidates for sophisticated applications in the future. In thisthesis, the magnetism in BiFeO3 (a multiferroic material with an incommensurate spin cycloidal structure), copper guanidiniam formate (a multiferroic metal-organic complex with a one-dimensional magnetic structure) and CP -RE-COT (a series of \zero-dimensional" single molecule magnets) are discussed. A radio-frequency plasma sputtering thin lm deposition system and a ferroelectric characterisation system were developed for the study of BiFeO3 epitaxial thin lms. A large leakag
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15

Yudin, Dmitry. "Trends in Magnetism : From Strong Correlations to “-onics” Technology." Doctoral thesis, Uppsala universitet, Materialteori, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-238177.

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Despite of enormous progress in experimental nanophysics theoretical studies of low-dimensional electron systems still remains a challenging task. Indeed, most of the structures are strongly correlated, so that an effective perturbative treatment is impossible due to the lack of a small parameter. The problem can be partly solved within the dynamical mean-field theory (DMFT) paradigm, nevertheless the correlations in physically relevant high-temperature superconductors are of purely non-local nature. The recently developed dual fermion approximation, combining field-theoretical diagram techniq
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16

Taga, Adrian. "Materials Engineering Using Density Functional Theory." Doctoral thesis, KTH, Materials Science and Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3809.

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<p>This doctoral thesis presents density functionalcalculations applied in several domains of interest in solidstate physics and materials science. Non-collinear magnetismhas been studied both in an artificial multi-layer structure,which could have technological relevance as a magnetic sensordevice, and as excitations in 3d ferromagnets. The intricatebulk crystal structure of γ-alumina has been investigated.An improved embedded cluster method is developed and applied tostudy the geometric and electronic structures and opticalabsorption energies of neutral and positively charged oxygenvacancies
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17

CAMPIGLIO, PAOLO. "Growth and magnetism of patterned atomic and molecular nanostructures." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/24288.

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The present thesis work deals with the study of the growth and properties of surface supported metallic, molecular and hybrid nanostructures. The fabrication of these nanostructures is made by following complementary approaches, namely self-organized growth of metal islands and dippen nanolithography. A common feature is to exploit the self-organization and self-assembly of metals and molecules on Au surfaces. However, in one case atoms spontaneously organize thanks to the Au surface reconstruction, while in the other one the pattern arises from a localized delivery of molecular components
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Coak, Matthew. "Quantum tuning and emergent phases in charge and spin ordered materials." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/280284.

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A major area of interest in condensed matter physics over the past decades has been the emergence of new states of matter from strongly correlated electron systems. A few limited examples would be the emergence of unconventional superconductivity in the high-T$_c$ superconductors and heavy-fermion systems, the appearance of the skyrmion magnetic vortex state in MnSi and magnetically mediated superconductivity in UGe$_2$. While detailed studies of many of the emergent phases have been made, there are still many gaps in understanding of the underlying states and mechanisms that allow them to for
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19

Herwadkar, Aditi Dr. "Electronic structure and magnetism in some transition metal nitrides: MN-doped ScN, dilute magnetic semiconductor and CrN, Mott insulator." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1164816868.

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20

Magill, Brenden A. "Microwave spectroscopy of edge and bulk modes of two dimensional electrons in magnetic field." Thesis, The Florida State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3564920.

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<p> Edge magnetoplasmons (EMPs) and pinning mode resonances in two dimensional electron systems (2DESs) can both be thought of as lower hybrid modes of cyclotron and plasma resonances. This dissertation describes low temperature microwave spectroscopy of both of these modes. EMPs have oscillating charge confined at the 2DES edge by the combination of the perpendicular magnetic field and the electrostatic potential that produces the edge. Pinning mode resonances are from electron solids oscillating against confinement provided by disorder in the bulk of the 2DES. </p><p> The first part of t
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21

Freitag, James M. (James Mac). "Structural and magnetotransport properties of nickelcobalt multilayers." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24003.

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Ferromagnetic/ferromagnetic Ni/Co multilayers with component layer thicknesses ranging from 40 A down to 5 A were prepared by DC-magnetron sputtering. Due to the fact that Ni and Co alloys share a common d band, it is expected that the total resistance of the multilayers, including the elemental resistance of the layers and the resistance of the interdiffused alloyed region at the interfaces, will be lower than for other 3d transition metal combinations. Consequently, the magnetoresistance ratio $ Delta rho/ rho$ is expected to be enhanced.<br>Structural characterization by grazing-angle X-ray
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22

Roussel, Harold. "Solutions of two matrix models for the DIII generator ensemble." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56957.

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In this work we solve two new matrix models, using standard and new techniques. The two models are based on matrix ensembles not previously considered. They are represented by special forms of antisymmetric matrices and are classified in the DIII generator ensemble. It is shown that, in the double scaling limit, their free energy has the same behavior as previous models describing oriented and unoriented surfaces. We also found an additional solution for the chapter 3 model.
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23

Houari, Ahmed. "Numerical studies of conductance fluctuations in disordered metals." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74576.

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We compute conductance fluctuations in a variety of disordered mesoscopic systems through direct numerical evaluation of the Kubo-Greenwood formula for the conductivity.<br>Our model Hamiltonian is quite different from the Anderson tight-binding Hamiltonian which has been most commonly used in studies of electronic structure and properties of disordered systems. It is reminiscent of the Kronig-Penney model in that $ delta$-like atomic potentials are specified by a single parameter.<br>Our model structures range from substitutional binary alloys to topologically disordered "glasses", and includ
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24

Eickmann, James Thomas 1970. "Influence of ultra-thin Au interface layers on the structure and magnetic anisotropy of Co films." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282634.

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I have investigated the influence of an ultra-thin Au interface layer on the magnetic anisotropy of Co-Pd and Co-Cu structures. Sandwich structures of the form X/Co/Y/Cu/Si(111), with (X, Y) = (Pd, Pd), (Au, Pd), (Pd, Au), (Cu, Cu), (Au, Cu), and (Cu, Au) were studied. For each structure, a Au layer of systematically varied thickness (t(Au)) was inserted at one Co interface. I also investigated Co/Pd and Co/Cu multilayer systems. For each Co-Pd sandwich structures a maximum is observed in the magnetic anisotropy for t(Au) = 1 to 1.5 atomic monolayer (ML). For the Co/Pd multilayer system, a max
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Wright, Jack Daniel. "Magnetism and superconductivity in iron pnictides and iron chalcogenides." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:c1f7563a-275f-415f-993e-98313b517296.

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This thesis presents a study on several series of unconventional Fe-based superconductors; namely, derivatives of NaFeAs and LiFeAs, as well as molecular-intercalated FeSe. Primarily using muon spin rotation (SR), but also x-ray diffraction (XRD) and magnetic susceptibility measurements, the nature of both magnetic and superconducting phases within these systems is studied. Particular attention is focussed on how these states compete or coexist with one another. The aforementioned experimental techniques are first used to explore the phase diagram of NaFe1xCoxAs. This phase diagram includes re
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Choi, Sungkyun. "Neutron and X-ray scattering studies of honeycomb iridates." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:d47c4e67-14c6-43ea-a8ba-47b9201b5002.

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This thesis presents neutron and x-ray scattering measurements on quasi-two-dimensional honeycomb antiferromagnets A2IrO<sub>3</sub> (A=Na, Li) and the solid-solution intermediate material (Na<sub>1-x</sub>Li<sub>x</sub>)<sub>2</sub>IrO<sub>3</sub>. The aim is to study the magnetic order and excitations of 5d Ir<sup>4+</sup> ions in a honeycomb lattice, where unusual magnetic properties have been theoretically predicted to be stabilised by the combinations of strong spin-orbit coupling and honeycomb lattice geometry with 90 degree Ir-O-Ir bonding. By using an optimised setup to minimise the st
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Franke, Isabel. "Magnetism in quasi-low-dimensional systems investigated with muon spin rotation and high magnetic fields." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:59880538-c5a5-4f7c-9d81-64e0d97f4ad1.

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This thesis presents the investigation of magnetism in a selection of low-dimensional systems and its relation to other physical properties, such as superconductivity. The techniques employed are muon spin rotation and pulsed magnetic field magnetisation. The ability of muons to directly probe the local field is used to study SrFeAsF, which is a parent compound of the high-temperature superconducting pnictides. This revealed that the magnetic and structural transitions are separated in this system. I then demon- strate the coexistence of magnetism and superconductivity in NaFeAs for the first
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Stojak, Kristen Lee. "Synthesis and Properties of Polymer Nanocomposites with Tunable Electromagnetic Response." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4587.

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Multifunctional polymer nanocomposites (PNCs) are attractive for the design of tunable RF and microwave components such as flexible electronics, attenuators, and antennas due to cost-effectiveness and durability of polymeric matrices. In this work, three separate PNCs were synthesized. Magnetite (Fe3O4) and cobalt ferrite (CFO) nanoparticles, synthesized by thermal decomposition, were used as PNC fillers. Polymers used in this work were a commercial polymer provided by the Rogers Corporation (RP) and polyvinylidene fluoride (PVDF). PNCs in this thesis consist of Fe3O4 in RP, CFO in RP, and Fe3
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Foronda, Francesca. "Muon spin spectroscopy and high magnetic field studies of novel superconductors and magnetic materials." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:55c7ed6b-af31-4b7b-8b64-217dcc6846ac.

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This thesis investigates a number of novel magnetic materials and high temperature superconductors using high-field magnetometry and muon spin spectroscopy (&mu;SR). The main measurement techniques are briefly described and a study of the dimer material [Cu(pyrazine)(glycine)]ClO<sub>4</sub> is presented to demonstrate the use of the proximity detector oscillator as a susceptometer in high magnetic fields. &mu;SR is a highly effective tool for probing magnetic order, spin freezing and spin dynamics. However, in some circumstances its performance may be impaired by the extent to which it pertur
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Massana-Cid, Helena. "Out-of-equilibrium dynamics in driven and active magnetic colloids." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668374.

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In this thesis we investigate the structure formation and the out-of-equilibrium dynamics of driven and active magnetic colloids. The interactions in our system were tuned in situ by using external fields, with the aim of finding novel approaches to drive and engineer these microparticles into a rich variety of microstructures. The colloids formed chains and clusters able to transport cargos, space-filling gels and self-healing crystals. Moreover, we demonstrated the bidirectional transport of paramagnetic particles on top of a structured magnetic substrate. Because of their associated length-
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Crosby, Christopher James. "Application of mineral magnetic measurements as a pollution proxy for urban road deposited sediment." Thesis, University of Wolverhampton, 2012. http://hdl.handle.net/2436/265493.

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Road Deposited Sediment (RDS) is an important pathway of pollution material in the urban environment. Traditional particulate matter (PM) monitoring methods are typically expensive and time consuming. To date, urban sediment studies have not fully explored the application of mineral magnetic technologies as an alternative to characterise RDS or, perhaps more importantly, their use as particle size proxy. Therefore, this study addresses these issues by determining the extent of any linkages between magnetic properties and the physio-chemical concentrations of RDS. Investigations have focussed o
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Hsu, Chia Wei. "Novel Trapping and Scattering of Light in Resonant Nanophotonic Structures." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:14226083.

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Nanophotonic structures provide unique ways to control light and alter its behaviors in ways not possible in macroscopic structures. In this thesis, we explore novel behaviors of light created by nanophotonic structures, with a common theme on resonance effects. The first half of the thesis focuses on a peculiar type of electromagnetic resonance, where the resonance lifetime diverges to infinity. These states, called bound states in the continuum, remain localized in space even though their frequency lie within a continuum of extended modes. We find such states in photonic crystal slabs and th
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Schade, Nicholas Benjamin. "Self-Assembly of Plasmonic Nanoclusters for Optical Metafluids." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467519.

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I discuss experimental progress towards developing a material with an isotropic, negative index of refraction at optical frequencies. The simplest way to make such a material is to create a metafluid, or a disordered collection of subwavelength, isotropic electromagnetic resonators. Small clusters of metal particles, such as tetrahedra, serve as these constituents. What is needed are methods for manufacturing these structures with high precision and in sufficient yield that their resonances are identical. Jonathan Fan et al. [Science, 328 (5982), 1135-1138, 2010] demonstrated that colloidal s
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Park, Sungkyun. "Interface effects in ultra-thin films: Magnetic and chemical properties." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279832.

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When the thickness of a magnetic layer is comparable to (or smaller than) the electron mean free path, the interface between magnetic and non-magnetic layers becomes very important factor to determine magnetic properties of the ultra-thin films. The quality of interface can enhance (or reduce) the desired properties. Several interesting physical phenomena were studied using these interface effects. The magnetic anisotropy of ultra-thin Co films is studied as function of non-magnetic underlayer thickness and non-magnetic overlayer materials using ex situ Brillouin light scattering (BLS). I obse
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Xiao, Bing. "Phase transitions, magnetism and surface adsorptions assessed by meta-GGA functionals and random phase approximation." Thesis, Temple University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3637521.

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<p> The meta-GGA functionals and random phase approximation are tested for phase transitions and a strongly correlated transition metal oxide in this dissertation. One of the latest meta-GGA functionals is also employed to study the van der Waals bound system in surface science. Our main purpose is to reveal the performance of new exchange-correlation functionals on various properties and systems. We are also interested in seeking the possible relationship between the performance of a semilocal functional and its exchange enhancement factor.</p><p> We have studied the structural phase transi
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Berger, Andrew Joseph. "Studying Spin and Charge Coupling in Operational Spintronic Devices Using Multi-Mode Magnetotransport Scanning Probe Microscopy and Ferromagnetic Resonance." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429702400.

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Ciuciulkaite, Agne. "The interaction of light and magnetism in the TbxCo100-x system." Licentiate thesis, Uppsala universitet, Materialfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394940.

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Development of the faster and denser magnetic memory storage elements has been an active area of research since early 20th century. The path of research on magnetization manipulation began with firstly changing the magnetization state of a medium in an external magnetic field, then heating of a medium and magnetizing with a permanent magnet was explored, while the latest efforts have been focused on switching the magnetization only by a polarized laser light. Nowadays due to the technological advancement of lasers and material fabrication methods, the search and development process of magnetic
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Hammerath, Franziska. "Magnetism and Superconductivity in Iron-based Superconductors as Probed by Nuclear Magnetic Resonance." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-89865.

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Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magneti
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Lou, Ming. "Exotic states in condensed matter I. Mesoscopic magnetism in integrable systems; II. Cooper pairing mediated by multiple-spin exchanges /." Cincinnati, Ohio : University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1218656392.

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Silberstein, Hont Markus. "Modeling the Effects of Strain in Multiferroic Manganese Perovskites." Thesis, KTH, Materialfysik, MF, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169584.

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The effects of strain on the magnetic phases in perovskites are of interest in the highly active research field of multiferroics. A Monte Carlo program is written to investigate the influence of strain on the low– temperature magnetic phase diagram of the manganese perovskites, RMnO3, where R is a cation in the lanthanide series. A Metropolis simulation scheme is implemented together with parallel tempering to perform computations in a two–dimensional geometry using a conventional nearest–neighbor and next–nearest–neighbor Heisenberg Hamiltonian, extended to include spin–lattice couplings and
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41

Hamida, Youcef. "MAGNETISM IN A NUMBER OF METAL ORGANIC FRAMEWORKS (MOFs) WITH 1D AND 3D CHARACTERISTICS: AN EXPERIMENTAL AND ANALYTICAL STUDY." Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/195069.

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Physics<br>Ph.D.<br>Metal Organic Frameworks (MOFs) exhibit many excellent physical properties including magnetic properties for potential applications in devices. More importantly for the subject of this thesis, MOFs are ideal for the realization of low dimensional magnetism because of the large selection of ligands connecting magnetic centers in making the framework. The materials studied in this thesis include ten magnetic MOFs of the form M(L1)(L2) [M = Cu, Ni, Co, Fe, Mn; L1 = NDC, bpdc, BDC, BODC, N3; L2 = DMF, H2O, TED, bpy]. Polycrystalline powder samples as well as single crystal samp
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42

Ott, Frédéric. "Neutron scattering on magnetic nanostructures." Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00429509.

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43

Hellsvik, Johan. "Atomistic Spin Dynamics, Theory and Applications." Doctoral thesis, Uppsala universitet, Materialteori, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-120103.

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The topic of this Thesis is magnetization dynamics on atomic length scales. A computational scheme, Atomistic Spin Dynamics, based on density functional theory, the adiabatic approximation and the atomic moment approximation is presented. Simulations are performed for chemically disordered systems, antiferromagnets and ferrimagnets and also systems with reduced dimensionality The autocorrelation function of the archetypical spin glass alloy CuMn is sampled in simulations following a quenching protocol. The aging regime can be clearly identified and the dependence of the relaxation on the dampi
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Roseman, Mark A. "Low temperature magnetic force microscopy studies of superconducting niobium films." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38266.

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Low temperature magnetic force microscopy studies of superconducting niobium films have been undertaken with the goal of studying the interplay between artificial pinning centers and magnetic vortices.<br>Measurements were performed using a custom built low temperature magnetic force microscope, capable of operation at temperatures ranging from 4.2 K to room temperature. Special attention has been paid to optimizing the instrumentation through a detailed study of the noise characteristics, with particular emphasis placed on achieving a large signal-to-noise ratio and corresponding high force g
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45

Casas, Brian Wesley. "Effects of disorder and low dimensionality on frozen dynamics in Ca3Co2-xMnxO6." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5657.

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Complex oxides represent an intersection of play grounds for the existence of exciting new fundamental physics and materials with potential technological implications. The realization of many exciting properties of these systems rely on the coupling of electronic, structural and magnetic degrees of freedom. Additionally, competing interactions within each type of coupling discussed previously lead to theoretically diverse ground states, which under the application of an external perturbation, can be tuned and probed. Ca3Co¬2-xMnxO6 represent a quasi-one dimensional Ising spin chain system orie
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46

Jiao, Jun 1957. "Comparative study of the properties, morphologies, and structures of carbon nanoclusters prepared by different methods." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282358.

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This study was undertaken to gain a greater understanding of the growth mechanism of carbon nanoclusters. A set of carbon nanocluster samples prepared by three different methods and under different conditions was characterized with respect to morphology, structure, composition, and related properties. Electron microscopy characterization techniques were used to identify these features. The carbon nanoclusters prepared by conventional arc discharge, modified arc discharge, and catalytic CO disproportionation appear quite different on the surface, but have features in common that this study emph
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47

Dally, Rebecca Lynn. "The implications of geometric frustration and orbital degeneracies on the evolution of magnetism in Na4Ir3O8 and α-NaMnO2". Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:108108.

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Thesis advisor: Stephen D. Wilson<br>Spin-orbit intertwined order gives rise to many novel phenomena with a broad phase space spanned by the competing energy scales within a system. This dissertation synthesized and studied two such systems demonstrating different manifestations of spin-orbit interactions, originating from orbital degeneracy effects, on geometrically frustrated magnetic lattices. Firstly, strong spin-orbit coupling in the hyperkagome lattice, Na4Ir3O8, and secondly, the layered material, α-NaMnO2, where single-ion anisotropy and a cooperative Jahn-Teller distortion drive magne
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48

Cherepov, Sergiy. "Resonant switching and vortex dynamics in spin-flop bi-layers." Doctoral thesis, KTH, Nanostrukturfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-27193.

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This thesis is a study of the static and dynamic behavior of the magne-tization in spin-flop bi-layers, which consist of two soft ferromagnetic layerscoupled by dipolar forces through a thin nonmagnetic spacer. The focus ofthe work is three fold: collective spin dynamics in the anti-parallel groundstate; resonant switching in the presence of thermal agitation; and static anddynamic behavior of the system in the vortex-pair state, with a particularemphasis on the interlayer core-core interaction. Two collective spin-flop resonance modes are observed and interpreted asacoustical and optical spin p
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Zhang, Shilei. "Chiral and topological nature of magnetic skyrmions." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:11306f2a-77e6-4f65-a3dd-3b1c2365ea32.

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This work focuses on characterising the chiral and topological nature of magnetic skyrmions in noncentrosymmetric helimagnets. In these materials, the skyrmion lattice phase appears as a long-range-ordered, close-packed lattice of nearly millimetre-level correlation length, while the size of a single skyrmion is 3-100 nm. This is a very challenging range of lengthscales (spanning 5 orders of magnitude from tens of nm to mm) for magnetic characterisation techniques. As a result, only three methods have been proven to be applicable for characterising certain aspects of the magnetic information:
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50

Mao, Ou. "Formation and stability of Sm2Fe17 carbides." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42089.

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Phase formation and transformation in mechanically alloyed iron-rich Sm-Fe-C is the principal subject of this thesis. Ternary Sm-Fe-C is a complicated system. The strategy was therefore to start with a binary system. A series of mechanically alloyed R$ sb2$Fe$ sb{17}$ powders were investigated for a better understanding of both the Sm-Fe alloy system in general and the Sm$ sb2$Fe$ sb{17}$ compound in particular. The objective was to learn (1) what is the steady-state in the mechanically alloyed R$ sb2$Fe$ sb{17},$ and (2) how the 2-17 structure is formed from the mechanically alloyed precursor
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