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Dissertations / Theses on the topic 'Magnetization dynamics of the nanoparticle'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Kesserwan, Hassan. "Ultrafast magnetization dynamics of magnetic nanostructures." Strasbourg, 2011. http://www.theses.fr/2011STRA6034.

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Divisé en deux parties, cette thèse décrit la dynamique d'aimantation de nanoparticules magnétiques. Dans la première partie, nous avons décrit une étude expérimentale détaillée de la dynamique d'aimantation dans des nanoparticules de CoPt sous forme de coeur/coquille. Pour cela, nous avons effectué des mesures d’effet Kerr magnéto-optique résolues en temps utilisant une pompe de 150 fs à 400 nm et une sonde de 150 fs à 800 nm. Nous avons étudié les différents processus qui ont lieu sur des échelles de temps bref : comme la démagnétisation ultrarapide et la précession du vecteur d’aimantation.

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2

Денисов, Станіслав Іванович, Станислав Иванович Денисов, Stanislav Ivanovych Denysov, et al. "Effective Landau-Lifshitz-Gilbert Equation for a Conducting Nanoparticle." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35362.

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We study the role of conductivity in the magnetization dynamics of single-domain ferromagnetic particles. Our approach is based on the coupled system of Maxwell’s and Landau-Lifshitz-Gilbert (LLG) equations that describes both the induced electromagnetic field and the magnetization dynamics. We show that the effective LLG equation for a conducting particle contains two additional terms compared to the ordinary LLG equation. One of these terms accounts for the magnetic field of eddy currents induced by an external magnetic field, and the other is magnetization dependent and is responsible

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3

Lu, Jie. "Field-driven magnetization dynamics of nanoparticles and nanowires /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202009%20LUJ.

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4

Yamamoto, Yoh. "Metastability of Magnetic Nanoparticles in Magnetization Relaxation with Different Dynamics and Distributions of Magnetic Anisotropy." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50969.

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We study the metastability of magnetic nanoparticles with size distributions. We simulate an array of magnetic nanoparticles with a spin S = 1 ferromagnetic Blume-Capel model on a square lattice. Studying decays of the metastable state in the Blume-Capel model at low temperatures requires an extremely long computational time in kinetic Monte Carlo simulations. Therefore, we use an advanced algorithm adapted from the Monte Carlo with absorbing Markov chain algorithm for the Ising model in order to study the Blume-Capel model with size distributions. We modeled the particle size distributions as

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5

Morales, Marienette B. "Magnetization Dynamics and Interparticle Interactions in Ferrofluids and Nanostructures." Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/3913.

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Nanoparticle assemblies are of current interest as they are used in a wide variety of industrial and biomedical applications. This work presents two studies aimed at understanding the magnetization dynamics and interparticle interactions in nanoparticle assemblies and various types of ferrofluids. First, we studied the influence of varying strengths of dipolar interaction on the static and dynamic magnetic properties of surfactant-coated monodispersed manganese-zinc ferrite nanoparticles using reversible transverse susceptibility. We tracked the evolution of the anisotropy peaks with varying m

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6

Liutyi, Taras Volodymyrovych, Тарас Владимирович Лютый, Тарас Володимирович Лютий, Oleksandr Yuriiovych Poliakov, Александр Юрьевич Поляков та Олександр Юрійович Поляков. "Стохастическая динамика намагниченности наночастицы во вращающемся магнитном поле". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/4223.

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7

Piquerel, Raoul. "Retournement de l'aimantation assisté par un champ micro-onde d'une nanoparticule individuelle." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00767410.

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Un magnétomètre microSQUID basse température couplé à une antenne micro-onde a été utilisé pour sonder la dynamique du retournement assisté de l'aimantation d'une nanoparticule ferromagnétique. Grâce au développement d'une technique de mesure originale, basée notamment sur le contrôle de l'amplitude et de la phase du champ micro-onde, nous avons pu mettre en évidence les bassins d'attraction liés aux modes de précession présents dans la dynamique de l'aimantation. Il devient possible de contrôler le retournement de l'aimantation selon que l'amplitude et la phase du champ AC sont judicieusement

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8

Lendínez, Escudero Sergi. "Magnetization dynamics at the nanoscale in nanoparticles and thin films: single-molecule magnets, magnetic vortices, and magnetic droplet solutions." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/395194.

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Research in magnetic materials leads to new devices and technologies. As the technology progresses, the devices become smaller and this miniaturization allows more storage capacity and lower costs in the production of new technologies. As new and smaller materials are fabricated, new phenomena appear and thus new physics is needed to describe them. Nanomaterials meet characteristics of both the microscopic quantum world and the macroscopic classic world. This intermediate length scale is known as mesoscale. Nanomaterials can be obtained in a variety of forms, being nanoparticles and magnetic u

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9

Sorea, Stanescu Dana Elena. "Magnetization dynamics in magnetic nanostructures." Phd thesis, Université Joseph Fourier (Grenoble), 2003. http://tel.archives-ouvertes.fr/tel-00006021.

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En utilisant la technique pompe-sonde résolue en temps, nous avons étudié la dynamique de l'aimantation dans des couches minces magnétiques avec une résolution temporelle de 20ps. La pompe est constituée par les champs magnétiques de hautes fréquences induits par des impulsions de tension appliquées sur une ligne coplanaire. Comme sonde, nous avons utilisé l'effet Kerr magnéto-optique et l'effet magnéto-résistif. Nous présentons la préparation des échantillons en utilisant le dépôt de couches minces par pulvérisation cathodique, la lithographie UV, ainsi que différentes techniques de gravure.

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10

Xu, Lei. "Magnetization Dynamics at Elevated Temperatures." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311342.

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The area of ultrafast (sub-nanosecond) magnetization dynamics of ferromagnetic elements and thin films, usually driven by a strong femtosecond laser pulse, has experienced intense research interest. In this dissertation, laser-induced demagnetization is theoretically studied by taking into account interactions among electrons, spins, and lattice. We propose a microscopic approach under the three temperature framework and derive the equations that govern the demagnetization at arbitrary temperatures.To address the question of magnetization reversal at high temperatures, the conventional Landau-

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11

Rantaharju, J. (Jyrki). "Magnetization dynamics in paramagnetic systems." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526221205.

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Abstract This thesis reports simulations of direct observables in electron and nuclear spin relaxation experiments in an example paramagnetic system, as well as polarization transfer occurring in a spin-exchange optical pumping (SEOP) experiment. Studies of paramagnetic relaxation are important, e.g., in the development of agents used for enhanced contrast in magnetic resonance imaging. SEOP is used to produce hyperpolarized noble gases, which are then used to, e.g., enhance sensitivity in structural studies of matter with nuclear magnetic resonance. Presently the theory, available software a

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12

Méndez, Édgar. "Effective Visualization of Magnetization Dynamics." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-372080.

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Simulations on magnetization dynamics are of great interest on current research. Unlike computational fluid dynamics, magnetization dynamics has not received much attention from the visualization community. In this work a design and preliminary implementation of a visualization tool for magnetization dynamics simulations is introduced, based on methods used in the literature of the field. Although immature, the introduced design and implementation provide some advantages over some tools in use, and further development could lead to a unified and complete visualization utility.

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13

Neudecker, Ingo. "Magnetization dynamics of confined ferromagnetic systems." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980172160.

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14

Wang, Suqin. "Magnetization dynamics of single domain nanomagnets /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2007. http://uclibs.org/PID/11984.

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15

Rumberger, Evan Michael Wong. "Magnetization dynamics in single-molecule magnets /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3153694.

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16

Uhlíř, Vojtěch. "Current Induced Magnetization Dynamics in Nanostructures." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233903.

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Předkládaná dizertační práce pojednává o problematice pohybu doménových stěn (DS) vyvolaného spinově polarizovaným proudem v magnetických nanodrátech na bázi spinového ventilu NiFe/Cu/Co. Jedná se o tzv. efekt přenosu spinového momentu. Multivrstevnatý systém NiFe/Cu/Co, kde se doménová stěna pohybuje ve vrstvě NiFe, vykazuje velmi vysokou účinnost přenosu spinového momentu, což bylo v literatuře potvrzeno na základě magnetotransportních měření. Tato práce má za cíl pozorovat stav DS během jejich pohybu, pomocí fotoelektronové mikroskopie kombinované s kruhovým magnetickým dichroismem. Tato te

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17

Kneip, Martin K. "Magnetization dynamics in diluted magnetic semiconductor heterostructures." kostenfrei, 2008. http://hdl.handle.net/2003/25822.

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18

Mondal, Ritwik. "Relativistic theory of laser-induced magnetization dynamics." Doctoral thesis, Uppsala universitet, Materialteori, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-315247.

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Ultrafast dynamical processes in magnetic systems have become the subject of intense research during the last two decades, initiated by the pioneering discovery of femtosecond laser-induced demagnetization in nickel. In this thesis, we develop theory for fast and ultrafast magnetization dynamics. In particular, we build relativistic theory to explain the magnetization dynamics observed at short timescales in pump-probe magneto-optical experiments and compute from first-principles the coherent laser-induced magnetization. In the developed relativistic theory, we start from the fundamental Dirac

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19

Chandra, Sayan. "Magnetization Dynamics and Related Phenomena in Nanostructures." Thesis, University of South Florida, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3604829.

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<p> Collective magnetic behavior in nanostructures is a phenomenon commonly observed in various magnetic systems. It arises due to competing inter/intra&ndashparticle; interactions and size distribution and can manifest in phenomena like magnetic freezing, magnetic aging, and exchange bias (EB) effect. In order to probe these rather complex phenomena, conventional DC and AC magnetic measurements have been performed along with radio&ndashfrequency; transverse susceptibility (TS) measurements. We also demonstrate the magnetic entropy change as a parameter sensitive to subtle changes in the magne

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20

Chandra, Sayan. "Magnetization Dynamics and Related Phenomena in Nanostructures." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4877.

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Collective magnetic behavior in nanostructures is a phenomenon commonly observed in various magnetic systems. It arises due to competing inter/intra–particle interactions and size distribution and can manifest in phenomena like magnetic freezing, magnetic aging, and exchange bias (EB) effect. In order to probe these rather complex phenomena, conventional DC and AC magnetic measurements have been performed along with radio–frequency transverse susceptibility (TS) measurements. We also demonstrate the magnetic entropy change as a parameter sensitive to subtle changes in the magnetization dynamic

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21

Wittmann, Andreas. "Magnetoresistance and magnetization dynamics in hybrid structures." München Verl. Dr. Hut, 2008. http://d-nb.info/991285271/04.

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22

Adams, Daniel J. "Magnetization Dynamics in Coupled Thin Film Systems." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2578.

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A study is presented detailing experimental investigations of magnetization dynamics in nanostructured systems which are coupled magnetically. This work seeks to characterize the anisotropy of such systems through experimental techniques which probe microwave resonant absorption in the materials. A custom-built experimental setup, designed and assembled in our labs, is explained in detail. This setup allows for angular-dependent ferromagnetic resonance (FMR) measurements in the sample plane through vector network analyzer spectroscopy and is adaptable to two different types of coplanar wavegui

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23

Coglitore, D. "Nanoparticle dynamics in simple fluids." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3007090/.

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The Stokes-Einstein relation is considered a benchmark in the transport of small particles in fluids, predicting an increase in diffusion with decreasing particle size. However, there is doubt about its validity at the nano-scale where some theoretical studies have predicted deviations from it. Experimental data from single nanoparticle tracking are presented in this thesis, collected using a recently-developed technique based on the optical phenomenon of caustics to detect the particle in a conventional inverted optical microscope. Experiments were performed on gold and polystyrene nanopartic

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24

Chimata, Raghuveer. "Magnetization dynamics of complex magnetic materials by atomistic spin dynamics simulations." Doctoral thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308329.

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In recent years, there has been an intense interest in understanding the microscopic mechanism of laser induced ultrafast magnetization dynamics in picosecond time scales. Magnetization switching on such a time scale has potential to be a significant boost for the data storage industry. It is expected that the writing process will become ~1000 times faster by this technology, compared to existing techniques. Understanding the microscopic mechanisms and controlling the magnetization in such a time scale is of paramount importance at present. In this thesis, laser induced ultrafast magnetization

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25

Borlenghi, Simone. "Electronic transport and magnetization dynamics in magnetic systems." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00590363.

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L'objectif de ce travail de thèse est de comprendre l'influence mutuelle entre le transport électronique et la dynamique de l'aimantation dans des nanostructures hybrides magnétiques métalliques. Dans une première partie on a développé un modèle théorique, basé sur la théorie des matrices aléatories, pour décrire au niveau microscopique le transport dépendent du spin dans une nanostructure hétérogène. Ce modèle, appélé CRMT (pour Continuous Random Matrix Theory) a ensuite été traduit dans un code de simulation qui permet de calculer les proprietés locales (couple de transfert de spin, accumula

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26

Alekhin, Alexandr [Verfasser]. "Ultrafast hot carrier driven magnetization dynamics / Alexandr Alekhin." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1088402275/34.

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27

Binder, Michael. "Magnetization dynamics of rare earth doped magnetic films." Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917185&prov=M&dok_var=1&dok_ext=htm.

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28

Binder, Michael. "Magnetization dynamics of rare-earth doped magnetic films /." Berlin : Logos-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917185&prov=M&dok_var=1&dok_ext=htm.

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29

Borlenghi, Garoia Simone. "Electronic transport and magnetization dynamics in magnetic systems." Paris 6, 2011. http://www.theses.fr/2011PA066009.

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L'objectif de ce travail de thèse est de comprendre l'influence mutuelle entre transport électronique et dynamique de l'aimantation dans des nanostructures hybrides magnétiques métalliques. Dans une première partie on a développé un modèle théorique, basé sur la théorie des matrices aléatories, pour décrire à niveau microscopique le transport dépendent du spin dans une nanostructure hétérogène. Ce modèle, appélé CRMT (Continuous Random Matrix Theory) a ensuite été traduit dans un code de simulation qui permet de calculer les proprietés locales (couple de transfert de spin, accumulation de spin

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30

Chico, Carpio Jonathan Philippe. "Magnetization dynamics on the nanoscale : From first principles to atomistic spin dynamics." Doctoral thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-287415.

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In this thesis first-principles methods, based on density functional theory, have been used to characterize a wide range of magnetic materials. Special emphasis has been put on pairwise magnetic interactions, such as Heisenberg exchange and Dzyaloshinskii-Moriya interactions, and also on in the Gilbert damping parameter. These parameters play a crucial role in determining the magnetization dynamics of the considered materials. Magnetic interaction parameters, has been calculated for several materials based on Co/Ni/Co heterostructures deposited on non-magnetic heavy metals where. The aim was t

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31

Stone, Tonya Williams. "MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS." MSSTATE, 2006. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/.

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Molecular dynamics simulations using the Embedded Atom Method were performed to describe the interparticle behavior of two single crystal spherical nickel nanoparticles during compaction based on applied strain rate, particle size, contact angle, and crystal orientation. The evolution of the contact surfaces was analyzed during the molecular dynamics simulation and an investigation of friction effects was conducted at the contact surfaces. The results from the current study were validated by comparing them to previous nanocrystalline research on bulk particle deformation and to previous studie

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32

Meier, Florian. "Coherent spin dynamics and magnetization transport in nanoscale magnetism /." [S.l.] : [s.n.], 2003. http://edoc.unibas.ch/diss/DissB_6468.

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33

Bocklage, Lars [Verfasser]. "Current-Induced Magnetization Dynamics of Ferromagnetic Nanostructures / Lars Bocklage." München : Verlag Dr. Hut, 2011. http://d-nb.info/1016531605/34.

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34

Cywiński, Łukasz. "Magnetization dynamics and spin diffusion in semiconductors and metals." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3259622.

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Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed June 21, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 175-186).

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35

Kneip, Martin [Verfasser]. "Magnetization Dynamics in Diluted Magnetic Semiconductor Heterostructures / Martin Kneip." München : GRIN Verlag, 2009. http://d-nb.info/1187730718/34.

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36

Zhang, Shulei. "Spin Transport and Magnetization Dynamics in Various Magnetic Systems." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/333352.

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The general theme of the thesis is the interplay between magnetization dynamics and spin transport. The main presentation is divided into three parts. The first part is devoted to deepening our understanding on magnetic damping of ferromagnetic metals, which is one of the long-standing issues in conventional spintronics that has not been completely understood. For a nonuniformly-magnetized ferromagnetic metal, we find that the damping is nonlocal and is enhanced as compared to that in the uniform case. It is therefore necessary to generalize the conventional Landau-Lifshitz-Gilbert equation to

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37

Kudo, Kiwamu. "Nonlinear Dynamics in Spin-Torque-Induced Magnetization Oscillation Phenomena." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/179374.

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38

SOARES, GABRIEL. "Magnetization dynamics and spintronics of soft magnetic thin films." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2841180.

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39

Niemann, Björn. "Population dynamics of nanoparticle precipitation in microemulsions." Magdeburg Docupoint-Verl, 2009. http://d-nb.info/998665185/04.

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40

Eschenlohr, Andrea. "Element-resolved ultrafast magnetization dynamics in ferromagnetic alloys and multilayers." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6284/.

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The microscopic origin of ultrafast demagnetization, i.e. the quenching of the magnetization of a ferromagnetic metal on a sub-picosecond timescale after laser excitation, is still only incompletely understood, despite a large body of experimental and theoretical work performed since the discovery of the effect more than 15 years ago. Time- and element-resolved x-ray magnetic circular dichroism measurements can provide insight into the microscopic processes behind ultrafast demagnetization as well as its dependence on materials properties. Using the BESSY II Femtoslicing facility, a storage r

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41

Vogel, Andreas [Verfasser]. "Magnetization dynamics in coupled ferromagnetic micro- and nanostructures / Andreas Vogel." München : Verlag Dr. Hut, 2012. http://d-nb.info/1021719501/34.

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42

De, Lucia Andrea [Verfasser]. "A multiscale approach to magnetization dynamics simulations / Andrea De Lucia." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1136752013/34.

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Sultan, Muhammad [Verfasser]. "Ultrafast magnetization dynamics of lanthanide metals and alloys / Muhammad Sultan." Berlin : Freie Universität Berlin, 2012. http://d-nb.info/102715171X/34.

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Dunst, Thomas [Verfasser], and Andreas [Akademischer Betreuer] Prohl. "Stochastic Control of Magnetization Dynamics / Thomas Dunst ; Betreuer: Andreas Prohl." Tübingen : Universitätsbibliothek Tübingen, 2016. http://d-nb.info/1164170384/34.

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Schellnegger, Christian [Verfasser], and Andreas [Akademischer Betreuer] Prohl. "Adaptivity for Stochastic Magnetization Dynamics / Christian Schellnegger ; Betreuer: Andreas Prohl." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1168729203/34.

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46

Ciuciulkaite, Agne. "Micromagnetic simulations of magnetization dynamics in iron-palladium nanostructure arrays." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-302889.

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Previous investigations of FePd circular island arrays have shown the hysteresis-free switching from vortex to collinear magnetic state at high temperatures [1]. This raises interest in the exploration of the temperature and inter-island interaction effect on the magnetization dynamics in this kind of structures. Ferromagnetic resonance (FMR) measurements allow for the investigation of the magnetization response to time-dependent magnetic field excitations. In this work, the dynamics of a square lattice of circular Fe20Pd80 alloy islands were investigated. The micromagnetic simulations of FMR

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47

Watzman, Sarah June. "Thermal Energy Conversion Utilizing Magnetization Dynamics and Two-Carrier Effects." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523621461827864.

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48

Liu, Xuan. "Investigation of the early time period of ultrafast magnetization dynamics." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS146.

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Le but de mes recherches est d'étudier les premiers instants de la désaimantation ultrarapide dans divers matériaux ferromagnétiques (Co, Ni et Fe ...) en utilisant différentes méthodes expérimentales, pour obtenir un nouvel aperçu des mécanismes physiques sous-jacents. Plus précisément, les questions particulières qui m'ont motivé étaient: 1. Dans les alliages ferromagnétiques Fe et Ni, les deux éléments sont fortement couplés par l’interaction d'échange. Ce couplage influence-t-il le temps de désaimantation après excitation avec un laser femtoseconde? 2. Le transport de spin superdiffusif po

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49

Sandler, Gene Michael. "Computational analyses of magnetization dynamics in thin film write heads /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9906468.

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50

Bobowski, Kamil Nick [Verfasser]. "Magnetization Dynamics in the Lanthanide Metal Gadolinium / Kamil Nick Bobowski." Berlin : Freie Universität Berlin, 2020. http://d-nb.info/1217657274/34.

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