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Tesis sobre el tema "Phase ferromagnetic"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 9 de febrero de 2022

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1

Marcham, Max Ken. "Phase-resolved ferromagnetic resonance studies of thin film ferromagnets." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3882.

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Precessional dynamics are exploited in the operation of high frequency magnetic devices such as magnetic disk drives, non reciprocal microwave devices and spin transfer oscillators. The trajectory of the precession and its damping are of crucial importance. This thesis presents the characterisation of a variety of magnetic thin film structures performed with a range of phase sensitive techniques. It is possible to obtain new insight by utilising the chemical and site specificity of X-ray Magnetic Circular Dichroism (XMCD) to isolate the precession in different chemical species or at distinct s

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2

Oukouiss, Abdelkarim. "Phase transitions in ferromagnetic fluids." Doctoral thesis, Universite Libre de Bruxelles, 1999. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211920.

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3

Diener, Jacobus Petrus Willem. "Ferromagnetic phase transitions in neutron stars." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71982.

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Thesis (PhD)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: We consider the ferromagnetic phase in pure neutron matter as well as charge neutral, betaequilibrated nuclear matter. We employ Quantum Hadrodynamics, a relativistic field theory description of nuclear matter with meson degrees of freedom, and include couplings between the baryon (proton and neutron) magnetic dipole moment as well as between their charge and the magnetic field in the Lagrangian density describing such a system. We vary the strength of the baryon magnetic dipole moment till a non-zero value of the magnetic

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4

Kayali, Mohammad Amin. "Spontaneous vortex phase and pinning in ferromagnetic-superconducting systems." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/409.

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Heterogeneous ferromagnetic-superconducting systems such as a regular array of ferromagnetic nano dots deposited on the top of a superconducting thin film have attracted many research teams both experimental and theoretical. The interest in these systems does not only stem from being good candidates for technological applications, but also because they represent a new class of physical systems where two competing order parameters can coexist. This work focuses on the theoretica laspects of these systems by studying the static and dynamics of few model systems. In the first part, the static pr

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5

Karahasanovic, Una. "Fluctuation-driven phase reconstruction at itinerant ferromagnetic quantum critical points." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3188.

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The formation of new phases close to itinerant electron quantum critical points has been observed experimentally in many compounds. We present a unified analytical model that explains the emergence of new types of phases around itinerant ferromagnetic quantum critical points. The central idea of our analysis is that certain deformations of the Fermi surface enhance the phase-space available for low-energy quantum fluctuations and so self-consistently lower the free energy. Using this quantum order-by-disorder mechanism, we find instabilities towards the formation of a spiral ferromagnet and sp

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6

Marsh, Richard. "Superconducting phase coherent electron transport in nano-engineered ferromagnetic vortices." Thesis, Royal Holloway, University of London, 2013. http://repository.royalholloway.ac.uk/items/66b15a59-0b9f-4e68-b0aa-47e93f77349a/6/.

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This thesis presents an experimental study of the superconducting proximity effect in sub-micrometer sized ferromagnetic discs. Such discs belong to a class of mesoscopic ferromagnets intermediate between microscopic magnets with dimensions below about 10nm that behave as single giant spins and macroscopic structures that are larger than approximately 1 micrometer where domains are formed to minimise stray fields. The magnetic structure of mesoscopic magnets is strongly dependent on their geometric shape, allowing for purposeful engineering of magnetic structures using modern lithographic tech

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7

Liu, Xiya. "Mesoscopic effects in ferromagnetic materials." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24669.

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Thesis (Ph.D.)--Physics, Georgia Institute of Technology, 2008.<br>Committee Chair: Davidovic, Dragomir; Committee Member: Citrin, David; Committee Member: Kindermann, Markus; Committee Member: Marchenkov, Alexei; Committee Member: Riedo, Elisa

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8

Gaucher, Samuel. "Growth of lattice-matched hybrid semiconductor-ferromagnetic trilayers using solid-phase epitaxy." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22599.

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Diese Arbeit befasst sich mit dem Wachstum von Dünnschichtstrukturen, die zur Herstellung eines Spin-selektiven Schottky-Barrier-Tunneltransistors (SS-SBTT) erforderlich sind. Das Bauelement basiert auf dem Transport von Ladungsträgern durch eine dünne halbleitende (SC) Schicht, die zwei ferromagnetische (FM) Kontakte trennt. Daher müssen hochqualitative und gitterangepasste vertikale FM/SC/FM-Trilayer gezüchtet werden, was aufgrund der inkompatiblen Kristallisationsenergien zwischen SC und Metallen eine experimentelle Herausforderung darstellt. Das Problem wurde mit einem Festphasenepitaxie-A

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9

Scully, Noelle Catherine. "Semiclassical phase-integral solutions of a Fokker-Planck equation for a ferromagnetic particle." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333834.

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10

Bargawi, Ahmad Yousef. "A study of the martensitic phase transition in the shape memory alloy Ni₂MnGa." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/32824.

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A study of the martensitic phase transition in the shape memory alloy Ni2MnGa has been carried out. Ni2MnGa is one of the group of "shape memory effect" alloys which are currently exciting considerable interest. The origin of this effect in the compound is in the phase change which takes place on cooling through T = 200 K from the cubic L21 Heusler structure to a tetragonal phase. Recently the results of band structure calculations have been used to conclude that in Ni2MnGa the structural phase transition is driven by a band Jahn-Teller distortion.

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11

Weber, Tobias [Verfasser]. "Dynamics at the Orbital Ordering Phase Transition in MgV2O4 and at the Ferromagnetic Phase Transition in MnSi / Tobias Weber." München : Verlag Dr. Hut, 2017. http://d-nb.info/1135596522/34.

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12

Cinnirella, Alessandro. "Dynamics of the Heisenberg XXZ model across the ferromagnetic transition." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9341/.

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In questa tesi viene presentata un'analisi numerica dell'evoluzione dinamica del modello di Heisenberg XXZ, la cui simulazione è stata effettuata utilizzando l'algoritmo che va sotto il nome di DMRG. La transizione di fase presa in esame è quella dalla fase paramagnetica alla ferromagnetica: essa viene simulata in una catena di 12 siti per vari tempi di quench. In questo modo si sono potuti esplorare diversi regimi di transizione, da quello istantaneo al quasi-adiabatico. Come osservabili sono stati scelti l'entropia di entanglement, la magnetizzazione di mezza catena e lo spettro dell'entangl

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13

Gaucher, Samuel [Verfasser]. "Growth of lattice-matched hybrid semiconductor-ferromagnetic trilayers using solid-phase epitaxy. / Samuel Gaucher." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1231275162/34.

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14

Kim, Dongkyun. "Specific heat and magnetization measurements on the ferromagnetic phase transition of manganites and ruthenates /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3044768.

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15

Kepa, Michal Wawrzyniec. "Probing the phase diagram of the ferromagnetic superconductor UGe2 using high pressure ultrasonic techniques." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/15955.

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The main goal of the project was to develop new experimental techniques to further investigate the phase diagram of the ferromagnetic superconductor UGe2 at high pressures. Of particular interest is the metamagnetic transition (FM1-FM2) which is thought to play the key role in the unconventional superconductivity in UGe2. The project attempted to detect experimentally the critical ferromagnetic fluctuations associated with the FM1-FM2 transition. The development of the experimental equipment constitutes a substantial part of the project and includes: (1) a 2-axis Rotation Stage for High Pressu

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16

Hurst, Jerome. "Ultrafast spin dynamics in ferromagnetic thin films." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE004/document.

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Dans cette thèse, on s’intéresse à l'étude théorique et à la simulation numérique de la dynamique de charges et de spins dans des nano-structures métalliques. Ces dernières années la physique des nano-structures métalliques à connu un intérêt croissant, aussi bien d'un point de vue de la physique fondamental que d'un point de vue des applications technologiques. Il est donc essentiel d'avoir des modèles théoriques nous permettant de décrire correctement ce type d'objets. Cette thèse comporte deux études distinctes. Dans un premier temps on utilise un modèle semi-classique dans l'espace des pha

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17

Khan, Mahmud. "Magnetic entropy changes and exchange bias effects associated with phase transitions in ferromagnetic Heusler alloys /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1456294961&sid=5&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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18

Gebretsadik, Adane Samuel Gebretsadik. "INTERPLAY BETWEEN CHEMICAL AND MAGNETIC DISORDER IN SELECTED ALLOYS CLOSE TO A FERROMAGNETIC QUANTUM PHASE TRANSITION." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1527609152939816.

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19

Cong, Daoyong. "Crystallographic study on Ni-Mn-Ga ferromagnetic shape memory alloys." Thesis, Metz, 2008. http://www.theses.fr/2008METZ045S/document.

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Les alliages ferromagnétiques à mémoire de forme (FSMAs : Ferromagnetic shape memory alloys) avec des compositions proches de Ni2MnGa ont attiré beaucoup d'attention en raison de leur effet de mémoire de forme gigantesque et de leur réponse rapide et dynamique. Dans ce travail, la structure cristalline, la cristallographie de transformation marténitique, la texture et l’effet de l'addition de Co à l'alliage Ni-Mn-Ga sont examinés systématiquement. Les mesures de diffraction aux neutrons montrent que la structure de Ni53Mn25Ga22 est caractérisée par un réseau tétragonal du groupe I4/mmm de 20K

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20

Cao, Hu. "Phase transformations in highly electrostrictive and magnetostrictive crystals: structural heterogeneity and history dependent phase stability." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28549.

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Ferroelectric and ferromagnetic materials have been extensively studied for potential applications in sensors, actuators and transducers. Highly electrostrictive (1-x)Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)-xPbTiO₃ (PMN-xPT) and highly magnetostrictive Fe-xat.%Ga are two such novel materials. Both materials systems have chemical disorders and structural inhomogeneity on a microscale, giving rise to an interesting diversity of crystal structures and novel macroscopic physical properties, which are dependent on thermal and electrical histories of the crystals. In this thesis, I have to investigated

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21

Heil, Todd M. "An Investigation of the Structural and Magnetic Transitions in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/30231.

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The martensite and magnetic transformations in Ni-Fe-Ga ferromagnetic shape memory alloys are very sensitive to both alloy chemistry and thermal history. A series of Ni-Fe-Ga alloys near the prototype Heusler composition (X2YZ) were fabricated and homogenized at 1423 °K, and a Ni₅₃Fe₁₉Ga₂₈ alloy was subsequently annealed at various temperatures below and above the B2/L21 ordering temperature. Calorimetry and magnetometry were employed to measure the martensite transformation temperatures and Curie temperatures. Compositional variations of only a few atomic percent result in martensite start te

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22

Zhang, Shaobin. "High frequency magnetic field-induced strain of ferromagnetic shape memory alloys." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLY011.

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Les alliages à mémoire de forme ferromagnétique (FSMAs) possèdent la capacité d’accommoder une large déformation réversible à haute fréquence à l’aide d'une réorientation de la martensite induite par un champ magnétique. Cependant, cette réorientation à haute fréquence induit un frottement au niveau des interfaces entre les variantes de martensite provoquant une dissipation et par suite une élévation significative de la température dans le matériau, ce qui pose des problèmes d'instabilité nuisant à la performance du comportement dynamique des FSMAs. En particulier, l'amplitude de la déformatio

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23

Mennerich, Christian [Verfasser]. "Phase-field modeling of multi-domain evolution in ferromagnetic shape memory alloys and of polycrystalline thin film growth / Christian Mennerich." Karlsruhe : KIT Scientific Publishing, 2013. http://www.ksp.kit.edu.

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24

Xu, Nan. "Study on phase stability, structural and magnetic properties of Ni-Mn-Ga ferromagnetic shape memory alloys by ab initio calculations." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0106.

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Les alliages ferromagnétiques à mémoire de forme (FSMAs: Ferromagnetic shape memory alloys) avec des compositions proches de Ni2MnGa ont attiré beaucoup d’attention en raison de leur effet de mémoire de forme gigantesque et de leur réponse rapide et dynamique. Dans ce travail, une investigation de ces matériaux via des calculs ab initio est effectuée en utilisant la théorie de la fonctionnelle de la densité (DFT) à l’aide du logiciel VASP. Pour la composition stoechiométrique de Ni2MnGa, alliage ferromagnétique à mémoire de forme, l'oscillation du moment magnétique de Ni qui dépend du réarrang

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25

Adawi, Hind. "Surface Effect Of Ferromagnetic Nanoparticles On Transition Between Single- And Multi-Domain Structure Or Between Single-Domain Structure And Superparamagnetic Phase." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1484061850635516.

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26

Yan, Li. "Two phase magnetoelectric epitaxial composite thin films." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/30130.

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Magnetoelectricity (ME) is a physical property that results from an exchange between polar (electric dipole) and spin (magnetic dipole) subsystem: i.e., a change in polarization (P) with application of magnetic field (H), or a change in magnetization (M) with applied electric field (E). Magnetoelectricity can be found both in single phase and composite materials. Compared with single phase multiferroic materials, composite multiferroics have higher ME effects. Through a strictive interaction between the piezoelectricity of the ferroelectric phase and the magnetostriction of the ferromagnetic p

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27

Karaca, Haluk Ersin. "Magnetic field-induced phase transformation and variant reorientation in Ni2MnGa and NiMnCoIn magnetic shape memory alloys." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1562.

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28

Mennerich, Christian [Verfasser], and B. [Akademischer Betreuer] Nestler. "Phase-field modeling of multi-domain evolution in ferromagnetic shape memory alloys and of polycrystalline thin film growth / Christian Mennerich. Betreuer: B. Nestler." Karlsruhe : KIT-Bibliothek, 2013. http://d-nb.info/1031709215/34.

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29

Lund, Ross G. "Problems from the mathematical analysis of complex materials : dynamics of domain walls in ferromagnetic nanowires & phase transitions in biaxial nematic liquid crystals." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658635.

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This thesis concerns two distinct problems from the mathematical analysis of complex materials. One of the central themes is variational principles, which are widely used to understand physical phenomena, and one of the central aims of this type of work is to provide rigorous mathematical support to known results from physical literature. The first problem studied originates from micromagnetic theory (continuum theory for magnetism) and is that of domain wall motion in ferromagnetic nanowires. The magnetization dynamics is governed by a partial differential equation known as the Landau-Lifshit

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30

Sang, Yan. "Phases and Phase Transitions in Quantum Ferromagnets." Thesis, University of Oregon, 2015. http://hdl.handle.net/1794/18716.

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In this dissertation we study the phases and phase transition properties of quantum ferromagnets and related magnetic materials. We first investigate the effects of an external magnetic field on the Goldstone mode of a helical magnet, such as MnSi. The field introduces a qualitatively new term into the dispersion relation of the Goldstone mode, which in turn changes the temperature dependences of the contributions of the Goldstone mode to thermodynamic and transport properties. We then study how the phase transition properties of quantum ferromagnets evolve with increasing quenched disorder

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31

Kockrick, Emanuel. "Magnetisch und katalytisch funktionalisierte mesoporöse Materialien." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23716.

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In der vorliegenden Arbeit wurden mesoporöse Materialien erfolgreich mit magnetischen bzw. katalytisch aktiven Nanopartikeln funktionalisiert, wobei zwei unterschiedliche Synthesestrategien verfolgt wurden. Zum einen erfolgte eine direkte Integration der katalytisch aktiven CeO2-Nanopartikel in poröse, thermisch stabile SiC-Matrizes mithilfe der inversen Mikroemulsionsmethode. Die Größe dieses wässrigen, cersalzhaltigen Nanoreaktors konnte über den RW-Wert (molares Wasser-Tensid-Verhältnis) im Bereich von 2,0-9,9 nm mit einer engen Größenverteilung variiert werden. Für katalytische Untersuchun

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32

Wang, Ruizhe. "Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091.

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33

Schmakat, Philipp [Verfasser], PETER [Akademischer Betreuer] [Gutachter] BOENI, and Winfried [Gutachter] Petry. "Neutron Depolarisation Measurements of Ferromagnetic Quantum Phase Transitions : Wavelength-Frame Multiplication Chopper System for the Imaging Instrument ODIN at the ESS / Philipp Schmakat ; Gutachter: Peter Böni, Winfried Petry ; Betreuer: Peter Böni." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1115332848/34.

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34

Silva, Jos? Eves Mendes da. "S?ntese an?lise das propriedades magn?ticas da ferrita de NiMg e caracter?sticas de absor??o de radia??o." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17600.

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Made available in DSpace on 2014-12-17T15:41:43Z (GMT). No. of bitstreams: 1 JoseEMS.pdf: 2230919 bytes, checksum: f0f4e57c89f3eae4282c6daae0fe0aba (MD5) Previous issue date: 2008-04-18<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>It was synthesized different Ni1-xMgxFe2O4 (0,2 ≤ x ≤ 0,7) compositions by use of citrate precursor method. Initially, the precursory citrates of iron, nickel and magnesium were mixed and homogenized. The stoichiometric compositions were calcined from 350?C to 1200?C at ambient atmosphere or in argon atmosphere. The calcined powders

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35

Moura, Alysson Elson Galv?o de. "S?ntese, sinteriza??o e caracteriza??o de ferritas ? base de Ni-Zn." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17599.

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Made available in DSpace on 2014-12-17T15:41:43Z (GMT). No. of bitstreams: 1 AlyssonEGM.pdf: 4274696 bytes, checksum: 0f940193275b15ce59b4b1f45e3dc11c (MD5) Previous issue date: 2008-09-24<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Were synthesized different ferrites NixZn1-xFe2O4 (0,4 ≤ x ≤ 0,6) compositions by using citrate precursor method. Initially, the precursors citrates of iron, nickel and zinc were mixed and homogenized. The stoichiometric compositions were calcined at 350?C without atmosphere control and the calcined powders were pressed in pell

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36

Montiel, Xavier. "Influence du spectre électronique et de l'effet paramagnétique sur les propriétés des hétérostructures supraconductrices." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00660954.

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Les hétérostructures de taille nanométrique comprenant des matériaux supraconducteurs (S) en contact avec des matériaux métalliques (N) ou ferromagnétiques (F) présentent des propriétés surprenantes. L'effet de proximité dans les structures F/S/F se manifeste par l'effet vanne de spin. Dans les jonctions S/F/S, on voit l'apparition d'une transition de phase 0-p. Ces propriétés dépendent des paramètres internes du ferromagnétiques. Dans la première partie, nous étudions l'influence d'un décalage énergétique et d'une différence de masse effective pour expliquer l'effet de vanne de spin inverse q

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37

Höglin, Viktor. "Structure-Magnetic Relationships in the Fe-Mn-P-Si System for Energy Applications." Doctoral thesis, Uppsala universitet, Oorganisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-234516.

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Demands for new, energy-efficient appliances have greatly increased in response to our growing need for a more environmentally friendly society. Magnetic refrigeration is a technique that utilizes the magnetocaloric effect, with possible energy savings of up to 30% compared to commercial gas compression refrigerators. A material appropriate for commercial magnetocaloric devices should be both cheap and non-toxic; it should also exhibit a first-order magnetic transitions close to room temperature. The magnetic properties of Fe2P-related materials can be relevant in this context, since their mag

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38

Bouchenoire, Laurence. "X-ray phase-plate studies of ferromagnets." Thesis, University of Warwick, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397283.

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39

Ubaid, Kassis Sara. "Magnetization and Transport Study of Disordered Weak Itinerant Ferromagnets." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1247865424.

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40

Chen, Xue. "Magneto-mechanical behaviors of ferromagnetic shape memory alloys." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/docs/00/84/86/30/PDF/Thesis_xue-Chen_ENSTA.pdf.

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Ferromagnetic Shape Memory Alloys (FSMA) are promising candidates for sensors and actuators for their high-frequency response and large reversible strain. The aim of this dissertation is the analysis of the magneto-mechanical behaviors of FSMA. In this aim, we study, both experimentally and theoretically, the martensite reorientation in FSMA. Firstly, a 2D/3D magneto-mechanical energy analysis is proposed and incorporated into phase diagrams for a graphic study of path-dependent martensite reorientation in FSMA under 3D loadings. Criteria and material requirements for obtaining reversible stra

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41

Crook, M. R. "Spin fluctuations and itinerant magnetism in the hexagonal Laves phase NbFe2 and related compounds." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284187.

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42

Cho, Hsiuchi. "Superconducting phase coherent electron transport in proximity conical ferromagnets." Thesis, Royal Holloway, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504806.

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The,purpose of the thesis is to report the inve?tigation of superconducting phase-periodic conductance oscillations in ferromagnetic wires with interfaces to conventional superconductors. The ferromagnetic wires were made of Holmium(Ho), a conical ferromagnet, and Aluminium(AI) is used as superconductor. The distance between the interfaces was much larger than the singlet superconducting penetration depth. The observed oscillations is explained as due to the long-range penetration of an unusual helical triplet component of the order parameter that is generated at the superconductor/ferromagnet

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43

Henriques, Eduardo Fontes. "Um Estudo do Método de Monte Carlo de Campo Médio." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-13052015-152807/.

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Utilizamos o método de Monte-Carlo de campo médio, proposto por Netz e Berker, para estudar o comportamento termodinâmico dos modelos de Ising e de Blume-Capel numa rede quadrada. Esse método mistura conceitos de amostragem aleatória (Monte Carlo) com equações de campo médio usual. Seus autores afirmam que o método pode permitir representações de diagramas de fase com amostragens muito menores do que as usadas nas simulações de Monte Carlo convencionais e com a eliminação de certas consequências indesejáveis da aplicação das equações de consistência de campo médio. Entretanto, não observamos,

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44

Haury, Axel. "Hétérostructures à puits quantique Cd(Mn)Te/CdMgZnTe dopées pgaz de trous et phase ferromagnétique." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10205.

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Nous presentons la premiere mise en evidence d'une phase ferromagnetique dans des heterostructures a puits quantique semimagnetique cdmnte/cdmgznte dopees p par modulation (azote) dans les barrieres. Dans de tels echantillons, le transfert de trous des barrieres dans le puits cree un gaz de trous quasi-bidimensionnel dans la couche de cdmnte. Pour optimiser les conditions de dopage, une etude preliminaire a ete menee sur une serie d'echantillons a puits quantiques non magnetiques cdte/cdmgznte montrant que, dans des puits de 80 a, le gaz de trous devient metallique pour des densites superieure

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45

Höppel, Lutz W. "Phase transitions in single layer and bilayer quantum Hall ferromagnets." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11380453.

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46

Thomas, Kennedy Jessica 1975. "Antiferromagnetism, ferromagnetism and magnetic phase separation in Bi₂Sr₂O₆â[delta]." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29312.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.<br>In title on t.p. "[delta]" appears subscript as the lower-case Greek letter.<br>Includes bibliographical references (p. 154-157).<br>Neutron scattering, magnetization and transport measurements were performed on single crystals of Bi2Sr2CoO6+[delta] to study the evolution of the magnetic properties as a function of the oxygen content . The oxygen content was varied by annealing single crystals in either a reducing or oxidizing environment to obtain an experimental range of 0.25 =/< [delta] =/< 0.5 and a correspo

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47

Křižáková, Viola. "Excitace a šíření spinových vln v magnonických krystalech připravených přímým zápisem fokusovaným iontovým svazkem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382268.

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Paramagnetické niklem stabilizované tenké vrstvy plošně centrovaného kubického Fe, epitaxně narostené na monokrystalickém substrátu Cu(100) jsou známy svou schopností strukturní a magnetické fázové přeměny při ozáření iontovým svazkem, a to do prostorově centrované kubické struktury charakteristické feromagnetickými vlastnostmi. Monokrystalický Cu(100) substrát je možné také nahradit Si(100) s mezivrstvou Cu(100). Pomocí fokusovaného iontového svazku lze dále snadno lokálně modifikovat magnetické vlastnosti ozařované vrstvy. Tato metoda přímého zápisu magnetických struktur je alternativou k bě

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Nguyen, Van Tang. "Nanostructured soft-hard magnetic materials with controlled architecture." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1007.

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Parmi les aimants sans terres raresactuellement étudiés, τ-MnAl ferromagnétique est uncandidat à haut potentiel, car il possède despropriétés magnétiques intrinsèques prometteuses.Dans cette thèse, Mn(Fe)AlC a été synthétisé parbroyage mécanique. Les effets du carbone sur lamicrostructure et les propriétés magnétiques ont étéétudiés. Les résultats montrent qu’une pureté élevéede τ-MnAl(C) pouvait être obtenue avec un dopage à2% en atomes de carbone, montrant clairement l’effetstabilisant du carbone. L’alliage Mn54.2Al43.8C2possède les meilleures propriétés magnétiques :aimantation à 2T M2T = 4

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Saxena, Siddharth Shanker. "Magnetic and superconducting phases of heavy fermion compounds." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323011.

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Fernandes, Rafael Monteiro. "Propriedades físicas de sistemas com interações competitivas." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277908.

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Orientadores: Harry Westfahl Junior, Amir Ordacgi Caldeira<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-10T23:02:41Z (GMT). No. of bitstreams: 1 Fernandes_RafaelMonteiro_D.pdf: 6829160 bytes, checksum: 4dfae2ffd4b06c5c3c1f89f399700913 (MD5) Previous issue date: 2008<br>Resumo: Um dos objetivos centrais das Ciências Naturais é relacionar as estruturas dos mais diversos sistemas com as funções particulares que os caracterizam. Por exemplo, no que se refere a materiais, sejam eles sintéticos ou biológicos, a ci

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