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Dissertations / Theses on the topic 'Magnetické vortexy'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Flajšman, Lukáš. "Vektorová Kerrova magnetometrie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232044.

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Increased complexity of novel magnetic materials in the last decade has placed high demands on the manufacturing process as well as on the characterization. One of the possibilities for characterization of magnetic samples is to exploit the magneto-optical effects. The presented work uses the magneto-optical Kerr effect as a major characterization technique to probe the magnetic properties of samples. We have developed a mathematical model describing the effect of the magnetization on the polarized light and present an apparatus capable of measuring the response given by the light-matter inter

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2

Balajka, Jan. "Přepínání chirality vortexů v magnetostaticky svázaných permalloyových nanodiscích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230609.

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The diploma thesis is concerned with switching of vortex circulation in magnetic nanodisks. The results of micromagnetic simulations of hysteresis loops of individual disks with different degrees of asymmetry are presented. The influence of geometric asymmetry of the disk on the shape of the hysteresis loop is discussed as well as switching of vortex circulation in asymmetric nanodisks by external in-plane magnetic field. Simulations of pairs of magnetostatically coupled nanodisks were carried out for different interdisk distances and degrees of asymmetry. By analysing the results of the simul

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3

Hladík, Lukáš. "Přepínání spinových vortexů v magnetických nanodiscích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230257.

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The diploma thesis deals with the switching of spin vortices in magnetic nanodisks. First, the basic concepts of (micro)magnetism are defined and existing theoretical and experimental achievements in the field of switching of the two basic characteristics (chirality and polarity) of magnetic vortex are summarized. Then the principle of dynamic switching of magnetic vortex chirality using in-plane magnetic field pulse with a well defined amplitude and duration is presented. There is no need to use a certain shape of nanodisks or asymmetry in magnetic field distribution. Nanostructures were prep

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4

Pigeau, Benjamin. "Magnetic vortex dynamics nanostructures." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00779597.

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This thesis is aimed at studying experimentally the magnetisationdynamics of discs in the sub-micron range made of low dampingferromagnetic materials. For this purpose, an extremely sensitivetechnique has been used: the ferromagnetic resonance force microscopy. A firstpart is devoted to the measurement of the eigenmodes of NiMnSb discstaken in their remanent state: a vortex. The influence of aperpendicular magnetic field on the spin wave modes in the vortex state willbe detailled. Then, the coupling mechanism between the vortex core andthese spin wave, eventually leading to its dynamical rever

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5

Li, Zhengnan. "Vortex magnetic separation (VMS)." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292447.

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6

Vaňatka, Marek. "Studium vortexových stavů v magnetostaticky svázaných magnetických nanodiscích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231770.

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Magnetic vortices in ferromagnetic disks are curling magnetization structures characterized by the sense of the spin circulation in the plane of the disk and by the direction of the magnetization in the vortex core. Concepts of memory devices using the magnetic vortices as multibit memory cells have been presented, which brought the high demand for their research in many physical aspects. This work investigates the magnetostatic coupling in pairs of ferromagnetic disks to clarify the influence of nearby disks or other magnetic structures to the vortex nucleation mechanism. To ensure that the v

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7

Staňo, Michal. "Charakterizace magnetických nanostruktur pomocí mikroskopie magnetických sil." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231312.

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The thesis deals with magnetic force microscopy of soft magnetic nanostructures, mainly NiFe nanowires and thin-film elements such as discs. The thesis covers almost all aspects related to this technique - i.e. from preparation of magnetic probes and magnetic nanowires, through the measurement itself to micromagnetic simulations of the investigated samples. We observed the cores of magnetic vortices, tiny objects, both with commercial and our home-coated probes. Even domain walls in nanowires 50 nm in diameter were captured with this technique. We prepared functional probes with various magnet

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8

Doupal, Antonín. "Studium vlastností kovových tenkých vrstev a nanostruktur pomocí rastrovací sondové mikroskopie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229111.

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This diploma thesis is focused on investigation of metallic thin films and nanostructures using scanning probe microscopy. Magnetic properties of these objects are studied by magnetic force microscopy, which is modification of scanning probe microscopy. In the theoretical part basic principles of scanning probe microscopy and magnetic force microscopy are summarized, and also principle of creation of magnetic domains and some special properties of ferromagnetic and antiferromagnetic materials. Further, two techniques of fabricating nanostructures are described. Experimental part is focused on

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9

Dhankhar, Meena. "Paměťová buňka založená na magnetických vortexech." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2021. http://www.nusl.cz/ntk/nusl-442336.

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Magnetické vortexy jsou charakterizovány směrem stáčení magnetizace a polarizací vortexového jádra, přičemž každá z těchto veličin nabývá dvojice stavů. Ve výsledku jsou tak k dispozici čtyři možné stabilní konfigurace, čehož může být využito v multibitových paměťových zařízeních. Tato dizertační práce se zabývá selektivním zápisem stavů magnetického vortexu v magnetickém disku pulzem elektrického proudu stejně jako jejich následným elektrickým čtením. Před samotnou realizací elektrických měření byla provedena statická měření přepínání stavů vortexu pomocí různých proudových pulzů v kombinaci

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10

Dapore-Schwartz, Samuel. "An atomic beam magnetic resonance study of a superconductor's magnetic vortex lattice /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487856906257537.

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11

Bespalov, Anton. "Vortex statics and dynamics in anisotropic and/or magnetic superconductors." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0239/document.

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Récemment, les études des propriétés de vortex Abrikosov dans des systèmes fortement anisotropes et magnétiques ont été stimulées par la découverte des supraconducteurs à base de fer et des supraconducteurs ferromagnétiques.Dans cette thèse nous étudions la statique et la dynamique de vortex dans ces systèmes. D’abord, le problème de l'interaction de vortex avec un petit défaut a été examiné dans le cadre de la théorie de Ginzburg-Landau. Le potentiel de pinning pour une cavité cylindrique elliptique a été calculé. D'autre part, la conductivité d'un supraconducteur anisotrope à l'état mixte a

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12

Ciuciulkaite, Agne. "Micromagnetic simulations for the investigation of magnetic vortex array dynamics." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280767.

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In this work the dynamics of permalloy circular magnetic islands of 225 nm radius and 10 nm thickness arranged into square lattices was investigated employing micromagnetic simulations.The simulations of the vortex magnetization loops and the ferromagnetic resonance (FMR) spectra were carried out using a free micromagnetics simulation software Mumax3. The obtained data was analyzed using Matlab. The simulations were carried out on a single vortex island as well as on two different lattices. The first lattice is comprised of interacting islands, while the second lattice - of non-interacting isl

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13

Pereira, de Oliveira Luis Filipe. "Glassy aspects of magnetic creep in vortex matter : a numerical approach." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428663.

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14

Recchia, Charles H. "Nuclear magnetic resonance studies of vortex dynamics in high temperature superconductors /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487940308432115.

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15

Wurft, Tobias [Verfasser]. "Investigation of the Magnetic Vortex State for Spin-Valve Sensors / Tobias Wurft." Bielefeld : Universitätsbibliothek Bielefeld, 2018. http://d-nb.info/1169057802/34.

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16

Badea, Robert. "MANIPULATION OF MAGNETIC VORTEX DYNAMICS REVEALED BY OPTICAL AND SINGLE-SPIN MICROSCOPY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544017306999889.

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17

Pinfold, Steven. "The magnetic phase diagram of high quality superconducting YBaâ†2Cuâ†3Oâ†7â†#delta# single crystals." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242788.

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18

Dias, Carlos Sato Baraldi 1983. "Estudo de vórtice magnético em nanopartículas para aplicações em hipertermia magnética." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276980.

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Orientadores: Flávio Garcia, Kleber Roberto Pirota<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-24T22:02:36Z (GMT). No. of bitstreams: 1 Dias_CarlosSatoBaraldi_D.pdf: 19717682 bytes, checksum: 212154446eec9e3ee26eee15692adfec (MD5) Previous issue date: 2014<br>Resumo: Durante este trabalho, estudamos a viabilidade de uma nova classe de partículas magnéticas otimizadas para a hipertermia magnética e que denominamos VIP (Vortex Iron oxide Particle). Estas partículas são compostas de óxidos de ferro (magnetita

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19

Sonier, Jeffrey E. "The magnetic penetration depth and the vortex core radius in type-II superconductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0016/NQ27252.pdf.

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20

Hauglin, Harald. "Vortex lattice structure in single crystal YBCO studied with atomic beam magnetic resonance /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487943341526625.

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21

Nakaharai, Shu. "Vortex States under Magnetic Fields Nearly Parallel to the Plane of Layered Superconductors." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150378.

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22

Heron, David Owen Goudie. "A study of superconductivity in single crystals and thin films using muon-spin rotation and neutron scattering." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/742.

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23

Weindler, Tobias [Verfasser], and Christian [Akademischer Betreuer] Back. "Field Driven Vortex Domain Wall Motion in Magnetic Nanostructures / Tobias Weindler ; Betreuer: Christian Back." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1203875347/34.

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24

Smith, Kevin Daniel. "Suppressible pinning of Abrikosov vortices effects of magnetic vortex arrays on thin superconducting films /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p1457405.

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Thesis (M.S.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed February 6, 2009). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 25-27).

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25

Iss, Cécile. "Elaboration de micro/nanopinces magnétiques pour applications biotechnologiques." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY018/document.

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Cette thèse propose de réaliser des micro/nano-pinces magnétiques articulées dont l'actionnement à distance est obtenu par l'application d'un champ magnétique. Cette idée innovante consiste à relier par l'un de leurs côtés deux microparticules magnétiques parallélépipédiques à l'aide d'une nano-charnière en or flexible. Destinées à des applications biotechnologiques et médicales, ces pinces ont pour finalité de capturer des micro/nano-objets ciblés biochimiquement pour y appliquer et mesurer des forces. Le défi de ce projet était de mener, à partir d'une idée simple, un ensemble d'études à la

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26

Gyawali, Parshu Ram. "Study of Doping Dependence of the Vortex Regime and Magnetic Response in an Underdoped High Temperature Superconductors." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1259609327.

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27

Beharrell, Paul Anthony. "A new industrial application of magnetic separation." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327333.

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28

Gangwar, Ajay [Verfasser], and Christian H. [Akademischer Betreuer] Back. "Electrical determination of vortex state in submicron magnetic elements / Ajay Gangwar. Betreuer: Christian H. Back." Regensburg : Universitätsbibliothek Regensburg, 2015. http://d-nb.info/1074285964/34.

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29

Burgos, Parra Erick Omar. "Time resolved and time average imaging of magnetic nano-structures." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34251.

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The ability of a ferromagnet to maintain its magnetic state in the absence of an external magnetic field has made ferromagnetic materials an important subject of study in physics since the end of the 19th century. Moreover, ferromagnetic materials are the cornerstone for data storage systems such as magnetic tapes, magnetic disk drives and magnetic random access memory. The discovery of the Giant Magneto Resistance (GMR) in 1988 suggested that, since the magnetic state of the electrical conductor has an important effect upon the current flow, there may also be an inverse influence of the curre

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30

Bäckström, Nils, Jonathan Löfgren, and Vilhelm Rydén. "Study of Magnetic Nanostructures using Micromagnetic Simulations and Monte Carlo Methods." Thesis, Uppsala universitet, Materialfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227804.

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We perform micromagnetic simulations in MuMax3 on various magneticnanostructures to study their magnetic state and response to external fields. Theinteraction and ordering of nanomagnetic arrays is investigated by calculating themagnetostatic energies for various configurations. These energies are then used inMonte Carlo simulation to study the thermal behaviour of systems of nanomagneticarrays. We find that the magnetic state of the nanostructures are related to theirshape and size and furthermore affect the emergent properties of the system, givingrise to temperature dependent ordering among

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31

Cuadra-Solís, Pedro-de-Jesús. "Vortex Dynamics in Superconducting Thin Films under Microwave Fields." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/348552.

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In this thesis we have studied the vortex dynamics in type-2 superconducting thin films made of La1.82Sr0.18CuO4, patterned Pb and MgB2, by means of the combination of microwave, dc and ac measurements. In particular, we explore first the magnetic moment response in real time under continuous and pulsed microwave mode, and second commensurability effects both in presence of microwave fields under ac susceptibility mode and using microwave reflection spectrometry. To carry out these measurements, we have designed and developed a low-temperature microwave setup to be used inside of an rf-SQU

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32

Locatelli, Nicolas. "Dynamique par transfert de spin et synchronisation d’oscillateurs couplés à base de vortex magnétiques." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112322/document.

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Le sujet de cette thèse concerne la dynamique auto-entretenue excitée par transfert de spin de vortex couplés, dans des structures de type nano-piliers vannes de spin (Py/Cu/Py). Un premier objectif a été de comprendre les processus de transport polarisé en spin et de transfert de spin associés à des configurations d’aimantation fortement non-homogènes. Cette étude a permis d‘identifier et ainsi de précisément contrôler les configurations magnétiques à base de vortex, et en particulier d’observer l’influence du transfert de spin sur les mécanismes de renversement du cœur de vortex. En combinan

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33

Claisse, J. R. "Vortex density motion in a cylindrical type II superconductor subject to a transverse applied magnetic field." Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341540.

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34

Grimaldi, Eva. "Étude des propriétés non-linéaires et de l’origine du bruit d’oscillateurs à transfert de spin à base de vortex : vers le développement de nano-dispositifs radiofréquences spintroniques." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112082/document.

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L’objectif principal de cette thèse vise la compréhension et la maitrise des mécanismes physiques menant à l’excitation du mode gyrotropique de vortex magnétique par transfert de spin, et en particulier l’origine des sources de bruit affectant sa dynamique. Ce travail est effectué dans la perspective de parvenir à l’amélioration des propriétés radiofréquences de ces dispositifs appelés Spin Transfer Oscillator.En effet, ces oscillateurs ont l’avantage d’être de taille submicronique (quelques dizaines à quelques centaines de nm), d’être compatibles avec les technologies CMOS et d’être résistant

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35

Rondin, Loïc. "Réalisation d'un magnétomètre à centre coloré NV du diamant." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00824468.

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L'imagerie de champs magnétiques de faible amplitude avec une résolution spatiale à l'échelle nanométrique est un enjeu important dans de nombreux domaines de la physique et pour de multiples applications, que ce soit par exemple en science des matériaux pour le stockage magnétique de l'information, ou bien en optique quantique afin de pouvoir contrôler un spin individuel utilisé comme bit quantique, ou encore en biophysique pour l'étude structurelle de protéines par résonance magnétique. Dans ce contexte, cette thèse décrit la réalisation d'un magnétomètre à balayage fondé sur la réponse magn

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36

Kusumi, Koji. "Study on thermal mixing enhancement of liquid metal filn-f1ow under magnetic fields by using ｓubmerged vortex generators". Kyoto University, 2019. http://hdl.handle.net/2433/242502.

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37

Edström, Alexander. "Theoretical and Computational Studies on the Physics of Applied Magnetism : Magnetocrystalline Anisotropy of Transition Metal Magnets and Magnetic Effects in Elastic Electron Scattering." Doctoral thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304666.

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In this thesis, two selected topics in magnetism are studied using theoretical modelling and computational methods. The first of these is the magnetocrystalline anisotropy energy (MAE) of transition metal based magnets. In particular, ways of finding 3d transition metal based materials with large MAE are considered. This is motivated by the need for new permanent magnet materials, not containing rare-earth elements, but is also of interest for other technological applications, where the MAE is a key quantity. The mechanisms of the MAE in the relevant materials are reviewed and approaches to in

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38

Jíra, Roman. "Generování náhodných čísel pomocí magnetických nanostruktur." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232088.

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Random number generation can be based on physical events with probabilistic character, or on algorithms that use complex or one-way functions, alternatively on both of these approaches. A magnetic vortex is a basic state of magnetization that forms in magnetic micro- and nanostructures of an appropriate shape, dimensions and material. Quantities of the magnetic vortex form randomly if ambient conditions are chosen eligibly. A concept of a true random number generator using a random switching of states of the magnetic vortex is presented in this thesis. This concept is realized and random numbe

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39

Heldt, Georg. "Arrays of magnetic nanostructures : a dynamical and structural study by means of X-ray experiments." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/arrays-of-magneticnanostructuresa-dynamical-and-structuralstudy-by-means-of-xrayexperiments(99302e83-f625-4c43-99c1-02b2576f0175).html.

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The work in this PhD thesis covers two strands of x-ray experiments: firstly, the characterisation of large arrays of dense structures by means of x-ray scattering, and, secondly, the investigation of hybrid anisotropy square structures with x-ray microscopy. The ability to accurately characterise large arrays of nanoscale magnetic structures is a key requirement for both scientific understanding and technological advance such as bit patterned recording media (BPM). In this work small angle x-ray scattering (SAXS) was investigated as a characterisation technique for large arrays of patterned s

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40

Létang, Jérémy. "États chaotiques et effets de modulation dans des oscillateurs à vortex." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS125.

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Les nano-oscillateurs à vortex sont des systèmes spintroniques dans lequel des courants électriques entrainent la giration par couple de transfert de spin d’une structure magnétique que l’on appelle vortex. Il s’agit d’un type de nano-oscillateur à transfert de spin permettant des applications dans les communications radiofréquences, la génération de champ magnétique et le calcul neuro-inspiré. Une propriété spécifique des systèmes à base de vortex est le renversement de la polarité du cœur de vortex, qui peut mener à des effets non-linéaires tels que le chaos. Comprendre comment de tels états

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41

Elias, Ricardo. "Solitons magnétiques et transitions topologiques." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4712/document.

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Dans cette thèse nous étudions théoriquement et numériquement les solitons magnétiques et leurs transitions topologiques. Dans une première partie, nous trouvons une solution en 3 dimensions appelée Point de Bloch qui vient de la minimisation de l'énergie d'échange, de l'énergie de Landau et de l'énergie dipolaire. Les oscillations autour du point de Bloch sont trouvées et quantifiées pour étudier le rôle des fluctuations quantiques dans sa stabilité.Dans une deuxième partie, nous regardons l'évolution d'un système ferromagnétique avec des textures de topologie non-triviale, couplé à des élect

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42

Klironomos, Alexios. "Structural transitions of the vortex lattice in anisotropic superconductors and fingering instability of electron droplets in an inhomogeneous magnetic field." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000723.

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43

Shapoval, Tetyana. "Local imaging of magnetic flux in superconducting thin films." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27206.

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Local studies of magnetic flux line (vortex) distribution in superconducting thin films and their pinning by natural and artificial defects have been performed using low-temperature magnetic force microscopy (LT-MFM). Taken a 100 nm thin NbN film as an example, the depinning of vortices from natural defects under the influence of the force that the MFM tip exerts on the individual vortex was visualized and the local pinning force was estimated. The good agreement of these results with global transport measurements demonstrates that MFM is a powerful and reliable method to probe the loca

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44

Hernandez, Sarah Christine. "IInvestigation of Magnetostatics of Exchange-Coupled Nano-dots using the Magneto-optic Kerr Effect Technique." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1249430747.

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45

Martin, Sylvain Yoann. "Etude de la dynamique des oscillateurs à vortex par synchronisation et modulation de fréquence." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY073/document.

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Depuis 2004, les composants radiofréquence (RF) suscitent un intérêt croissant au sein de la communauté spintronique, tant du point de vue de la physique fondamentale que des applications potentielles. Ces composants ont émergé suite à la découverte du couple de transfert de spin (STT) qui permet d'exciter l'aimantation grâce à un courant électrique. Dans ce contexte, j'ai étudié des oscillateurs à vortex basés sur des jonctions tunnel magnétiques à très faible résistance dans lesquelles un vortex magnétique suit un mouvement périodique dû au STT.On observe des oscillations de ce vortex lorsqu

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Shapoval, Tetyana. "Local imaging of magnetic flux in superconducting thin films." Doctoral thesis, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 2009. https://tud.qucosa.de/id/qucosa%3A25239.

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Local studies of magnetic flux line (vortex) distribution in superconducting thin films and their pinning by natural and artificial defects have been performed using low-temperature magnetic force microscopy (LT-MFM). Taken a 100 nm thin NbN film as an example, the depinning of vortices from natural defects under the influence of the force that the MFM tip exerts on the individual vortex was visualized and the local pinning force was estimated. The good agreement of these results with global transport measurements demonstrates that MFM is a powerful and reliable method to probe the local varia

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De, Marneffe Jean-François. "Experimental study of the magnetic phase diagram and the vortex dynamics in epitaxial thin films of the Bi2Sr2CaCu2O8 + x High Tc superconductors." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211570.

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Hernandez, Sarah Christine. "Investigation of magnetostatics of exchange-coupled nano-dots using the magneto-optic Kerr effect technique." Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1249430747.

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Medvedyeva, Kateryna. "Characteristic properties of two-dimensional superconductors close to the phase transition in zero magnetic field." Doctoral thesis, Umeå : Univ, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-102.

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Hamadeh, Abbass. "Synchronization of spin trasnsfer nano-oscillators." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112262/document.

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Les nano-Oscillateurs à transfert de spin (STNOs) sont des dispositifs capables d'émettre une onde hyperfréquence lorsqu'ils sont pompés par un courant polarisé grâce au couple de transfert de spin. Bien qu'ils offrent de nombreux avantages (agilité spectrale, intégrabilité, etc.) pour les applications, leur puissance d'émission et leur pureté spectrale sont en général faibles. Une stratégie pour améliorer ces propriétés est de synchroniser plusieurs oscillateurs entre eux. Une première étape est de comprendre la synchronisation d'un STNO unique à une source externe. Pour cela, nous avons étud

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