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Rozprawy doktorskie na temat „Ferromagnetism”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 25 lipca 2025

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1

Soares, Gabriel 1988. "Competição entre anisotropias perpendiculares em bicamadas de CoCrPt/Ni resolvida por ressonância ferromagnética." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276925.

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Orientadora: Fanny Béron<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-28T23:44:04Z (GMT). No. of bitstreams: 1 Soares_Gabriel_M.pdf: 11563028 bytes, checksum: 679e40dbf51a0c4198966c4f0eee8e20 (MD5) Previous issue date: 2015<br>Resumo: Desde a descoberta dos filmes finos magnéticos com anisotropia perpendicular, ou PMAs (Perpendicular Magentic Anisotropy, em inglês), se tornou possível aumentar drasticamente a densidade de dados em discos rígidos. Uma maneira de continuar a incrementar a densidade final
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2

Villuendas, Pellicero Diego. "Magnetic deflagration in Mn₁₂-ac and Nd₅Ge₃ : new techniques and phenomena." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/396118.

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The goal of this work is to investigate the magnetic deflagration phenomena in two very different magnetic systems, using two very different experimental techniques. In the first chapter of this dissertation I introduce the concept of magnetic deflagra-tion, together with a description of the state of the art of the field. In the second chapter of this thesis I present the study of magnetic deflagration in single crystals of the prototypical single molecule magnet Mn12—ac, using the magneto-optical imaging method; never done before. In the chapter the reader will find out that, effective
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3

Fácio, Thais Josiani Silva. "Transporte eletrônico em estruturas híbridas : uma aproximação usando funções de green de não-equílibrio /." Ilha Solteira, 2016. http://hdl.handle.net/11449/136339.

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Orientador: Ezequiel Costa Siqueira<br>Banca: Victor Ciro Solano Reynoso<br>Banca: Rodrigo Yoshikawa Oeiras<br>Resumo: Neste trabalho é proposto a investigação teórica de uma junção formada por metal supercondutor e um metal ferromagnético acoplados através de dois canais. O primeiro canal consiste de um acoplamento direto entre os metais, enquanto que o segundo canal é formado através um ponto quântico composto por um nível discreto. Para isso utilizamos como ferramenta as funções de Green de não-equilíbrio, por meio das quais obtemos o cálculo e as curvas para a corrente elétrica, números de
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4

Coy, Emerson. "Growth and characterization of new multiferroic materials." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/395177.

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Multiferroic materials, in which two or more ferroic ordering take place in the same phase, have driven major interest in the last few years, not only due to the possibility of exploring novel physical properties in those materials, but also the implications that such properties show in novel technological applications. From those materials, the especially interesting are those in which the ferromagnetic (FM) and ferroelectric (FE) ordering take place, due to their direct application in magnetodielectric devices. In the field of multiferroic materials such materials could play an important rol
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5

Boerner, Eric D. "Simulation of thermal decay and dynamic relaxation in ferromagnetic materials /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9956455.

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Paula, Fagner Muruci de 1983. "Coerência quântica macroscópica em sistemas ferromagnéticos." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277293.

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Orientador: Amir Ordacgi Caldeira<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-19T09:51:01Z (GMT). No. of bitstreams: 1 Paula_FagnerMurucide_D.pdf: 4858080 bytes, checksum: a43c455fc79aac38fc3e9bd9d81abe32 (MD5) Previous issue date: 2011<br>Resumo: Por muitas décadas, fenômenos quânticos foram observados com partículas microscópicas, tais como átomos, elétrons e fótons. No entanto, avanços na fabricação e controle de sistemas físicos com dimensões extremamente reduzidas vêm permitindo a manifestação de event
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7

Wang, Yutian. "Defect-induced ferromagnetism in SiC." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-164623.

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Defect-induced ferromagnetism is attracting intensive research interest. It not only challenges the traditional opinions about ferromagnetism, but also has some potential applications in spin-electronics. SiC is a new candidate for the investigation of defect-induced ferromagnetism after graphitic materials and oxides due to its high material purity and crystalline quality. In this thesis, we made a comprehensive investigation on the structural and magnetic properties of ion implanted and neutron irradiated SiC sample. In combination with X-ray absorption spectroscopy and first-principles cal
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8

Statuto, Nahuel. "Magnetic Excitations Induced by Surface Acoustic Waves and Spin-Polarized Currents." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667710.

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The goal of this thesis is to explore and control the magnetization dynamics on magnetic multilayered thin films through two different techniques: the application of strain and spin- polarized currents, which represent lower-power consumption approaches to the control of magnetization dynamics compared with conventional techniques. The ferromagnetic materials with nanometric thickness used in this thesis are magnetic materials widely used in research. Aside the purely scientific interest, these materials are potentially applicable in telecommunications or technologies for storing and transm
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9

Pereira, Estéfani Marchiori. "Interação entre ferromagnetos e supercondutores em nanoestruturas fabricadas por ablação a laser e litografia por feixe de elétrons." Niterói, 2017. https://app.uff.br/riuff/handle/1/3949.

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Submitted by Biblioteca do Instituto de Física (bif@ndc.uff.br) on 2017-07-04T18:17:13Z No. of bitstreams: 1 Estéfani M Pereira (Mestrado).pdf: 29753105 bytes, checksum: 975117286ae941fc4c80d8fb96a32de5 (MD5)<br>Made available in DSpace on 2017-07-04T18:17:13Z (GMT). No. of bitstreams: 1 Estéfani M Pereira (Mestrado).pdf: 29753105 bytes, checksum: 975117286ae941fc4c80d8fb96a32de5 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro<br>Dois fenômenos de
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10

Yin, Shuangye. "Ferroelectric and Ferromagnetic Alloy Clusters in Molecular Beams." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11463.

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Ferroelectric and ferromagnetic alloy clusters are produced and studied in molecular beams. Nb clusters doped with 1-3 impurity atoms are ferroelectric with low transition temperatures. The alloy clusters with an even number of valence electrons have larger dipole moments than those with odd number of valence electrons. The ferroelectricity is suppressed by magnetic impurities or thermal excitations, and is enhanced by Au and Al doping. The observations strongly suggest that electron-pairing interactions exist in Nb clusters, which indicates Cooper pairing in clusters. The magnetic moments of
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11

Ramos, Rudnei de Oliveira. "Paredes de domínios em ferromagnetismo." Universidade de São Paulo, 1989. http://www.teses.usp.br/teses/disponiveis/43/43132/tde-01072015-153458/.

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Determinamos a tensão superficial de um defeito do tipo parede de domínio, utilizando a aproximação semiclássica no contexto da teoria de campos à temperatura finita para o modelo ? (?2)2 com interação invariante por simetria O(N), obtendo em seguida a temperatura crítica Tc de transição de fase e cálculo dos expoentes críticos ? e ?, aplicando então os resultados obtidos para a descrição de um modelo fenomenológico descrevendo o ferromagnetismo.<br>We determine the surface tension of a domain wall defect by using the semi classical approach in the context of field theory at finite temperature
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12

Lussier, Alexandre Francois. "Ferromagnetism in cobalt-doped titanium dioxide." Diss., Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/lussier/LussierA1205.pdf.

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13

Brydon, Philip M. R. "Coexistence of superconductivity and excitonic ferromagnetism." View electronic text, 2002. http://eprints.anu.edu.au/documents/disk0/00/00/07/63/index.html.

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Thesis (BSc. (Hons))--Australian National University, 2002.<br>Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 27, 2003). "A thesis submitted for the degree of Honours in theoretical physics at the Department of Physics and Theoretical Physics, The Faculty of Science, The Australian National University" "Honours thesis submitted November 2002" Includes bibliographical references.
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14

Knothe, Angelika Hildegard [Verfasser], and Andreas [Akademischer Betreuer] Buchleitner. "Quantum hall ferromagnetism in multicomponent systems." Freiburg : Universität, 2017. http://d-nb.info/1142738698/34.

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15

Knothe, Angelika Hildegard. "Quantum Hall Ferromagnetism in Multicomponent Systems." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS595/document.

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Cette thèse traite des systèmes de Hall quantiques en deux dimensions, dans lesquels les électrons peuvent porter plusieurs degrés de liberté discrets différents. Le ferromagnétisme de Hall quantique fournit une manière de traiter ces degrés de liberté électroniques comme des spins et isospins effectifs des électrons. Les différentes phases du système correspondent alors à différents ordres de spin ou d'isospin. En exploitant cette analogie, nous explorons différents aspects des systèmes bi-dimensionnels dans le régime de Hall quantique en étudiant la structure correspondante des spins et isos
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16

Igarashi, Ricardo Noboru. "Estudo teórico de nanoestruturas magnéticas em superfícies metálicas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26032013-144125/.

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Neste trabalho, utilizamos o método de primeiros princípios RS-LMTOASA (Real Space - Linear Muffin-Tin Orbital - Atomic Sphere Approximation), baseado na Teoria do Funcional da Densidade (DFT Density Functional Theory) e implementado para o cálculo de estruturas magnéticas não colineares, para investigar as propriedades magnéticas de nanoestruturas adsorvidas em superfícies metálicas. Primeiramente, devido ao aparecimento de estruturas magnéticas complexas, foram estudadas nanoestruturas magnéticas depositadas em substratos ferromagnéticos. Foram consideradas nanoestruturas de Mn tais como na
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17

Labarta, Amílcar. "Estudio de las propiedades magnéticas de ftalocianinas y sistemas ferromagnéticos diluidos." Doctoral thesis, Universitat de Barcelona, 1985. http://hdl.handle.net/10803/665977.

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Los trabajos de esta memoria persiguen un doble objetivo. Por un lado se ha pretendido ahondar en modelos de campo cristalino para cationes 3d(n) y su correlación con los datos experimentales, de sustancias de interés catalítico y básico. En segundo lugar, se trataba de iniciar un estudio amplio y ambicioso sobre sistemas desordenados. En esta Tesis hemos estudiado sistemas ferromagnéticos diluídos y se han utilizado modelos de campo medio y de simulación Monte Carlo para determinar diferentes magnitudes macroscópicas, a la vez que contestar a ciertas preguntas fundamentales, referidas al comp
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18

Menéndez, Dalmau Enric. "Generation of ferromagnetism on non-magnetic materials." Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/3417.

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En els darrers anys, el desenvolupament de nous mètodes per a la fabricació de xarxes ordenades de nanoestructures magnètiques (litografia magnètica) ha esdevingut un camp de recerca de gran interès. Això es deu tant per l'ampli ventall d'aplicacions tecnològiques que se'n deriven de les estructures magnètiques de grandària submicromètrica (biomedicina, gravació magnètica, ...), com per raons de caire més fonamental, ja que sovint el comportament magnètic d'aquests materials a escala nanomètrica és diferent del corresponent als materials massissos. <br/>Els aliatges de Fe60Al40 (percentatge at
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19

Saubi, Benjamin Haubiih. "Studies in ferromagnetism using electron polarization analysis." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249391.

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20

Talut, Georg. "Ferromagnetismus in mit Fe implantierten GaN und TiO2." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27497.

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In the present study it was tried to create a diluted magnetic semiconductor on the basis of GaN and TiO2 by means of ion beam implantation. In most cases, by characterization of structural and magnetic properties, it was possible to prove that the ferromagnetic state is related to either spinodal decomposition or secondary phase formation. In case of Fe implanted GaN spinodal decomposition, epitaxially oriented alpha-Fe or epsilon-Fe3N nanocrystals were found to be responsible for the ferromagnetic behavior. In addition, the formation of gamma-Fe clusters was observed. Similarly, in TiO2 the
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21

Cunha, Anderson Magno Chaves. "Correspondência entre ondas de spin de um ferromagneto em uma rede favo de mel e a banda de energia do grafeno." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/8968.

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CUNHA, Anderson Magno Chaves. Correspondência entre ondas de spin de um ferromagneto em uma rede favo de mel e a banda de energia do grafeno. 2014. 88 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2014.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2014-08-29T18:55:19Z No. of bitstreams: 1 2014_tese_amccunha.pdf: 4561415 bytes, checksum: 8c98814cdc7a5600944fbf5d0bfb400f (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2014-08-29T18:56:
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Iakovlev, Ilia. "Internal Field NMR of Cobalt nanoparticles in catalysts : size effects and particle-support interaction." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS079.

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Les propriétés chimiques de nanoparticules de Co supportées dépendent de leur taille, de leur morphologie, de leur structure cristalline et de la force de l'interaction avec le support. Ces caractéristiques se reflètent dans les propriétés magnétiques des nanoparticules, notamment dans la distribution du champ magnétique hyperfin à travers la particule et donc dans leur ferromagnétisme et dans la fréquence de résonance des noyaux de 59Co dans une expérience de RMN à champ interne (IF NMR). Cette technique de RMN non conventionnelle est un outil puissant pour étudier la structure cristalline et
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23

Law, Sarah Ann. "Magnetic excitations in ZrZn←2." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279921.

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Lo, Chi Kuen. "Construction of a surface magneto-optical Kerr polarimeter and the study of ultra thin Fe films on Si(111)." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239543.

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Broom, Darren Paul. "A structural study of a commercial metal hydride battery electrode material." Thesis, University of Salford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272622.

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Jordan, Simon Mark. "The MOKE characterisation of magnetic multilayers." Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284135.

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Kennewell, Kimberly. "Surface and interface anisotropies measured using inductive magnetometry." University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0243.

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In this thesis, an inductive ferromagnetic resonance (FMR) technique is developed to measure the magnetisation dynamics in thin films across a wide range of frequencies and fields. In particular, this project concentrates on measuring higher order exchange dominated modes to observe surface and interface effects in bilayer films. The experimental technique was first developed as a time domain technique, utilising a fast rise time (~50 ps) step pulse to disturb the equilibrium position of the magnetisation. The subsequent precessional damped decay was measured at different applied fields to obs
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28

Richard, Caroline. "Interplay of ferromagnetism and superconductivity : (in hybrid structures)." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY066/document.

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Ferromagnétisme et supraconductivité conventionnelle sont deux phases antagonistes dont la compétition peut facilement être étudiée dans les structures hybrides S/F. En particulier, une supraconductivité triplet odd-frequency peut être induite dans une couche ferromagnétique en régime diffusif.Dans une première partie, on étudie les courants qui circulent à l'équilibre dans de telles jonctions hybrides S/F. On prédit l'existence d'un courant triplet longue portée dans une bicouche ferromagnétique d'aimantation non homogène. La relation courant phase a la particularité d'être superharmonique. C
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Murakami, Regina Keiko. ""Novos materiais magnéticos para imãs de alta performance"." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-14022006-182556/.

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O objetivo do presente trabalho foi desenvolver novos materiais magnéticos para ímãs de alta performance. Duas classes de materiais foram estudadas: materiais a base de (Nd,Sm)5(Fe,MT)17, onde MT é um metal de transição, e materiais nanocristalinos a base de (Nd,Pr)FeB com adições de TiC. As ligas (Nd,Sm)5(Fe,MT)17 foram preparadas por fusão em forno de arco e posteriormente foram tratadas termicamente por longos períodos (no mínimo 30 dias). Tentamos melhorar as propriedades magnéticas por meio de substituições químicas (Ti, Co, Mn, etc.) e/ou por introdução intersticial de deutério ou nit
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30

Thompson, Guy Russell. "Mössbauer spectroscopic studies of the ferrimagnets Na₂M²⁺FeF₇(M=Ni, Mn and Co) and nanophase barium ferrite". Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240809.

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He, Jiexuan. "Effects of spin current in ferromagnets." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/6060.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 4, 2009) Vita. Includes bibliographical references.
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Soltan, Soltan. "Interaction of superconductivity and ferromagnetism in YBCO-LCMO heterostructures." Göttingen Cuvillier, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=97407683X.

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Chan, Jennifer Ann. "High temperature ferromagnetism in polymerised fullerene and graphitic systems." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428595.

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Ahilan, K. "Superconductivity on the border of itinerant ferromagnetism in UGe2." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595374.

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In this dissertation I have reported and discussed the results that suggest that superconductivity arises out of itinerant electron ferromagnetism in UGe<SUB>2</SUB>. Superconductivity is observed in the milli-Kelvin temperature range and close to but below the critical pressure where the Curie temperature collapses to absolute zero. This appears to be first example of this type of phenomena in Nature. A realistic model for the mechanism for pairing has not yet been developed for UGe<SUB>2</SUB>. We note, however, that a satisfactory description would have to explain not only the occurrence of
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35

Rodríguez, González Agustín. "The helical antiferromagnetism and ferromagnetism in GD-Y alloys." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399394.

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Majidi, Muhammad Aziz. "Computational Studies of Ferromagnetism in Strongly Correlated Electronic Systems." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148320220.

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Thapa, Sunil. "Defects and Ferromagnetism in Transition Metal Doped Zinc Oxide." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467319340.

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38

Kienert, Jochen. "Ferromagnetism and interlayer exchange coupling in then metallic films." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15834.

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Die vorliegende Arbeit befasst sich mit dem ferromagnetischen Kondo-Gitter-Modell (s-d-, s-f-Modell) für Filmstrukturen. Die Spin-Fermion-Wechselwirkung des Modells kommt in Materialien vor, in denen lokalisierte Spins mit beweglichen Ladungsträgern wechselwirken, wie etwa in (verdünnten) magnetischen Halbleitern, Manganaten, oder Seltene-Erd-Verbindungen. Die durch die Ladungsträger vermittelte, indirekte Wechselwirkung zwischen den lokalisierten Spins reicht von der langreichweitigen, oszillierenden RKKY-Austauschwechselwirkung im Falle schwacher Kopplung bis zur kurzreichweitigen D
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Júnior, Gerson Ferreira. "Ferromagnetismo no regime Hall quântico inteiro via teoria do funcional de densidade." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-31082011-100156/.

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O efeito Hall quântico surge em gases de elétrons bidimensionais (2DEG) na presença de altos campos magnéticos B. O campo magnético quantiza o movimento planar dos elétrons em órbitas ciclotrônicas caracterizadas pelos níveis de Landau. Neste regime a resistividade transversal (ou Hall) &rho;xy em função de B exibe platôs em submúltiplos inteiros de e2/h, i.e., &rho;xy = &nu;-1 e2/h, sendo &nu; o fator de preenchimento dos níveis de Landau. Por sua vez, a resistividade longitudinal &rho;xx apresenta picos nas transições entre platôs de &rho;xy. Em primeira instância, &rho;xx é uma medida indir
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Iwamoto, Wellington Akira 1979. "Estudos das propriedades magnéticas dos filmes finos de GaAs dopado com Mn e de Zn1-xCoxO." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278526.

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Orientador: Pascoal J. G. Pagliuso<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-10T11:33:54Z (GMT). No. of bitstreams: 1 Iwamoto_WellingtonAkira_M.pdf: 1834376 bytes, checksum: f57724e8570a2064285943632257620b (MD5) Previous issue date: 2007<br>Resumo: Semicondutores ferromagnéticos (FM) são compostos de grande interesse tecnológico devido à possibilidade de combinar suas cargas e o grau de liberdade de spin para produzir dispositivos eletrônicos. Em particular, filmes finos semicondutores dopados com
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Santos, Antonio Domingues dos. "Anisotropias induzidas em ligas ferromagnéticas amorfas." Universidade de São Paulo, 1991. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-17072012-113147/.

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Apresentaremos uma série de estudos realizados sobre o tema anisotropias magnéticas induzidas (Kind) em 1igas amorfas. Foram usados vários tipos de tratamentos térmico, com o objetivo de obtermos uma visão amp1a do assunto. A análise teórica dos dados de Kind e de \"after-effect\" magnético (MAE) foi feita com um modelo baseado em sistemas de dois níveis (TLS). A partir da análise dos dados experimentais obtém-se um largo espectro de energias de ativação. Estas energias estão relacionadas aos tempos de re1axação, através da equação de Arrhenius: = 0 exp (E/kT), onde o pré-fator 0 é da ord
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Yang, Chunlei. "Studies of the spintronic systems of ferromagnetic GaMnAs and non-magnetic InGaAs/InAlAs two dimensional electron gas /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20YANG.

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Kang, Hun. "A Study of the Nucleation and Formation of Multi-functional Nanostructures using GaN-Based Materials for Device Applications." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14094.

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Self-organized GaN nanostructures have been accomplished with lattice-(mis)matched using MOCVD. A lattice mismatched system (i.e. GaN nanostructure/ AlN) was utilized with S-K mode mechanism, whereas, metallic droplet method (i.e. Vapor-Liquid-Solid method) was employed in the lattice matched system (i.e. GaN nanostructure / AlGaN). The nanostructure size is adjustable by changing growth parameters (height: 2 ~ 15nm and diameter: 10 ~ 100nm). It has been found that the photon emission energy is tunable relative to the nanostructure size, and smaller nanostructures have larger photon energy. H
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Mishra, Subodha. "Theory of photo-induced ferro-magnetism in dilute magnetic semiconductors." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4413.

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Thesis (Ph. D.) University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 6, 2007) Includes bibliographical references.
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Gester, Matthias. "Structural and magnetic properties of epitaxial Fe and Co films on GaAs substrates." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338052.

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Gillies, Murray Fulton. "An investigation of the magnetic properties of spin-valves using transmission electron microscopy." Thesis, University of Glasgow, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294195.

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Vavekis, Konstantinos. "Structural, magnetic and superconducting properties of fulleride salts." Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362276.

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Roberts, Hywel Gwynedd. "Magnetism and transport in nanostructured domain wall systems." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486849.

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The precise control of ferromagnetic domain wall formation opens up exciting avenues of research and potential application in spintronics ? the manipulation of charge carriers via their spin properties. Recent experiments on Cobalt-Platinum multilayers containing artificially created domains provide the motivation for this work. In this thesis the electronic structure of CoPt multilayers are calculated by an ab initio multiple scattering method, and attempts are made at replicating the systems used in experiments, including lattice relaxations and the effects of substitutional alloying. The ma
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Zhang, Yi. "Fermi Liquid Study of Exotic Modes in Magnetically Ordered Systems." Thesis, Boston College, 2014. http://hdl.handle.net/2345/bc-ir:103563.

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Thesis advisor: Kevin S. Bedell<br>The Landau Fermi liquid theory is a very successful theory in condensed matter physics. It provides a phenomenological framework for describing thermodynamics, transport and collective modes of itinerant fermionic systems. In 1957, Silin described the spin waves in polarized Fermi liquids based on Landau Fermi liquid theory, which are related to series of components of the spherical harmonic expansion of the fermi surface. It has been proved by Pomeranchuck that for the Fermi surface to be stable, the Landau parameters should satisfy the relation: $F_l^{s,a}&
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Sibley, Lara Ann. "Measurements on the itinerant ferromagnet ZrZn₂ under hydrostatic pressure." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609915.

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