Rozprawy doktorskie na temat „Ferromagnetic resonance”
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Marcham, Max Ken. "Phase-resolved ferromagnetic resonance studies of thin film ferromagnets". Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3882.
Pełny tekst źródłaKim, Jongjoo. "Localized Ferromagnetic Resonance using Magnetic Resonance Force Microscopy". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222191966.
Pełny tekst źródłaLee, Inhee. "Nanoscale Ferromagnetic Resonance Imaging using Magnetic Resonance Force Microscopy". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281111992.
Pełny tekst źródłaInkoom, Godfred. "Ferromagnetic Resonance of LSMO Thin Film". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12933.
Pełny tekst źródłaBataiev, Yurri N. "Ferromagnetic Resonance Study of Spintronics Materials". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236192587.
Pełny tekst źródłaDenysenkov, Vasyl. "Broadband Ferromagnetic Resonance Spectrometer : Instrument and Applications". Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3602.
Pełny tekst źródłaThis thesis compiles results of research in two mutuallydependent parts: 1) development of ferromagnetic resonance(FMR) spectrometer to study microwave properties offerromagnetic materials, and 2) characterization of new irongarnets: pulsed laser deposited Y3Fe5O12and Bi3Fe5O12films and Ce:Y3Fe5O12single crystal.
First part describes a novelBroadbandFMRSpectrometerdesigned to characterize thin ferromagneticfilms. The spectrometer uses two probeheads: one is the X-bandmicrowave reflection cavity for room temperature measurementsand the in-cryostat microstrip line probe to perform FMRexperiments in the frequency range from 50 MHz to 40 GHz. Veryuniform and stable magnetic field up to 2.4 T, temperatures 4 Kto 420 K, and continuous frequency scan performed byHP8722Dvector network analyzer provide various modes ofoperation. Both probeheads are equipped with two-circlegoniometers to ensure accurate study of magneticanisotropy.
The spectrometer was used to make express-analysis ofquality thus to optimize processing parameters of epitaxialiron garnet films grown by pulsed laser deposition (PLD).Comprehensive study of uniaxial and cubic magnetocrystallineanisotropy has been performed for Ce:Y3Fe5O12bulk crystal as well as for Y3Fe5O12and Bi3Fe5O12films grown on different substrates by PLD andreactive ion beam sputtering techniques. BroadbandFMR-spectroscopy revealed difference in spectra of domain wallresonances: instead ofsoftspin modes in filmsgrown by liquid phase epitaxy, PLD-made films showdiffusetransformation of domains near thesaturation field. This effect indicates non-uniformity ofsaturation magnetization and field of uniaxial anisotropy inPLD-iron garnets. Spin wave resonances in comparison withuniform FMR have been studied to evaluatelocalqualityof ferromagnetic films. The resonance field andFMR linewidth behavior were studied at various crystallographicdirections determined by X-ray diffraction.
FMR was used to choose PLD-made YIG films with low losses atmicrowave frequencies and to build magnetostatic surface wavesmicrowave bandpass filter. The filter was designed as a planarfilm structure with a microstrip line for transducers. It is afirst demonstration of feasibility to introduce PLD processingtechnique to magnetostatic wave technology.
Magneto-optical study of Ce:Y3Fe5O12single crystal complements results ofFMR-spectroscopy of new garnets.
Keywords:ferrites, thin films, ferromagnetic resonance,microwaves, FMR spectrometer, magnetic anisotropy,magnetostatic waves.
Adams, Daniel J. "Ferromagnetic Resonance Studies of Coupled Magnetic Systems". ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2121.
Pełny tekst źródłaKhazen, Khashayar. "Ferromagnetic resonance investigation of GaMnAs nanometric layers". Paris 6, 2008. https://tel.archives-ouvertes.fr/tel-00329331v2.
Pełny tekst źródłaThis thesis is dedicated to the study of the magnetic properties of GaMnAs nanometric layers by the ferromagnetic resonance (FMR) technique. Three series of samples have been studied to investigate independently the influence of the strain, the hole concentration and the Mn concentration on the magnetic properties of GaMnAs. In the first series, the Ga1-xMnxAs samples with x=0. 07, grown on GaAs (compressive strain) and GaInAs (tensile strain) substrates are studied. The results of magnetization, resistivity and Hall effect measurements are presented. From the FMR measurements the easy axes of magnetization and the type of magnetic anisotropy are determined. The angular variations of the FMR spectra are studied in detail and the g-factor, Curie temperature and the magnetocrystalline anisotropy constants are determined as function of temperature. Spin wave resonance were equally observed and interpreted. The observations are compared to the proposed phenomenological models and the spin stiffness and the exchange integral between the Mn ions are deducedThe second study concerns a series of GaMnAs samples with the same Mn doping level of 7% atomic concentration in which the hole concentrations was varied via a hydrogen passivation technique. The hole concentrations are deduced from Hall effect measurements in high fields and low temperatures. The measured hole concentrations correspond to different conductivity regimes from insulating to impurity band and metallic regimes. The samples are characterized by SQUID magnetometry and resistivity measurements. The magnetization as a function of hole concentration is compared to the predictions of the RKKY model. ERDA measurements are performed to determine the concentration of hydrogen in the ferromagnetic sample with the lowest hole concentration. The domain structure of this samples is investigated by magneto-optical Kerr effect microscopy. The FMR spectra are analyzed in details and the hole concentration corresponding to the onset of ferromagnetism is estimated to 1019cm-3. The g-factors depend on the hole concentration and temperature. The relation between the g-factors and the theoretically calculated hole polarization of the samples is presented. The anisotropy studies of the samples have provided the investigation of the magnetocrystalline anisotropy constants as a function of the hole concentration and the temperature. Their variations are compared to the theoretical models. The energy surfaces deduced from the measured magnetocrytalline anisotropy constants are calculated as a function of magnetization and applied field orientations and magnitudes. The influence of increasing the doping level from 7% to 21% atomic concentration is studied in the third series of samples. Contrary to the theoretical predictions, the critical temperature is not increased above 180K. The FMR parameters are compared to those of standard GaMnAs sample doped with 7%atomic concentration of Mn. The reason for no further increase in TC is attributed to high level of magnetic compensation. The measurements are also compared to the theoretical predictions based on the mean field approximations. The relaxation of the magnetization is studied as a function of strain, hole concentration, Mn concentration as well as temperature. The damping constants were found to be anisotropic. This anisotropy however depends strongly on the process whose contribution is dominant for a specific configuration of the system
Kennewell, Kimberly. "Surface and interface anisotropies measured using inductive magnetometry". University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0243.
Pełny tekst źródłaManuilov, Sergey. "Ferromagnetic resonance in films with growth induced anisotropy". Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48248.
Pełny tekst źródłaQC 20111122
Unwin, Marion Elizabeth. "Broadband ferromagnetic resonance studies of magnetic recording media". Thesis, Keele University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414759.
Pełny tekst źródłaWhite, Shane Paul White. "Study of Heavy Metal/Ferromagnetic Films Using Electrical Detection and Local Ferromagnetic Resonance Force Microscopy". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524172007784423.
Pełny tekst źródłaFang, Dong. "Current-induced torque driven ferromagnetic resonance in magnetic microstructures". Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/241302.
Pełny tekst źródłaKörner, Michael. "Morphology-Induced Magnetic Phenomena Studied by Broadband Ferromagnetic Resonance". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-127005.
Pełny tekst źródłaIn Rahmen dieser Arbeit wurde der Einfluss der Morphologie eines dünnen ferromagnetischen Films auf dessen statische und dynamische Eigenschaften mittels breitbandiger ferromag- netischer Resonanz (FMR) untersucht. Durch Ionenstrahl-Erosion wurde die Oberfläche des verwendeten Substrats periodisch moduliert (Ripple), wobei die Wellenlänge der Modulation durch die Ionenenergie bestimmt ist. Dies ermöglicht die kontrollierte Herstellung rauer Oberflächen mit Wellenlängen zwischen wenigen zehn bis zu einigen hundert Nanometern. Werden auf diesen Oberflächen Filme abgeschieden, übernehmen diese die Modulation. Somit ergibt sich eine einfache und schnelle Untersuchungsmöglichkeit der magnetischen Filmeigenschaften in Hinblick auf die Morphologie. Das Ziel dieser Arbeit ist die Untersuchung von Morphologieeinflüssen auf die magnetische Anisotropie sowie FMR-Linienbreite. Im Vorfeld der magnetischer Untersuchungen wurde der bestehende FMR-Aufbau um einen Messmodus erweitert, sodass Messungen bei fester Mikrowellenfrequenz und gleichzeitigem Durchfahren eines externen magnetischen Feldes möglich wurden. Weiterhin wurde ein Softwarepaket für die Datenauswertung entwickelt. Beginnend mit dem Morphologieeinfluss auf die magnetische Anisotropie wurden 10 nm dünne Fe, Co und Ni81Fe19 (Permalloy ≡ Py) Filme auf periodisch moduliertem Si abgeschieden. Durch Versetzungen während der Ionenstrahl-Erosion und Bildung einer natürlichen Oxidschicht bildet sich bei den verwendeten Substraten eine amorphe Oberfläche, was zu polykristallinem Schichtwachstum führt. Dadurch wird die magneto-kristalline Anisotropie unterdrückt und morphologie-induzierte Beiträge bestimmen die Anisotropie. Beobachtet wurde eine induzierte uniaxiale magnetische Anisotropie (UMA), deren leichte Richtung sich entlang der Ripple-Wellenzüge ausrichtet. Mittels schichtdickenabhängigen Messungen wurden zwei charakteristische Regionen mit konkurrierender uniaxialer Volumen- und Oberflächenanisotropie ermittelt. Dabei ist die Volumenkomponente im Bereich dünner Schichten vorherrschend und die magnetischen Momente richten sich entlang der Oberflächenmodulation aus. Für dickere Schichten ist die UMA dahingegen durch dipolare Streufelder bestimmt. Die experimentellen Funde werden in beiden Bereichen durch mikromagnetische Simulationen untermauert. Im Gegensatz zu erodiertem Si behält MgO seine Kristallstruktur, was epitaktisch gewachsene, einkristalline Fe-Schichten von 10 nm Dicke ermöglicht. Folglich wurde eine Überlagerung aus induzierter und kristalliner Anisotropie beobachtet. Dadurch, dass die Richtung der Ripple durch die Richtung des Ionenstrahls während der Erosion vorgegeben wird, lässt sich die UMA frei gegen die kristalline Anisotropie drehen, was wiederum Möglichkeiten zur gezielten Beeinflussung der Anisotropie bietet. Im Hinblick auf die dynamischen magnetischen Eigenschaften führen Ripple zu einer Verringerung der intrinsischen und extrinsischen Relaxationsbeiträge. Für den letzten Teil der Arbeit wurde 30 nm dünnes Py auf Si-Ripple gewachsen, wobei ein Wellenlängenbereich von λ = 27 nm bis 432 nm abgedeckt wurde. Mit Hilfe von magnetischer Kraftmikroskopie und Holographie wurden die dipolaren Streufelder über und in den Filmen untersucht. Ab λ ≥ 222 nm ermöglichen diese dipolaren Felder eine Streuung von Spinwellen, sodass Zwei-Magnonen-Streuung (TMS) auftritt. Dies führt zu einer scheinbaren Linienverbreiterung und äußert sich durch einzelne Peaks in der frequenzabhängigen Linienbreite. Letztere lassen sich in ihrer Frequenzposition durch die Wellenlänge des Substrates beeinflussen und können mittels einer kürzlich in der Literatur veröffentlichten Störungstheorie für Spinwellen in periodisch gestörten Filmen erklärt werden. Weiterhin wurde in der winkelabhängigen Linienbreite eine zweifache Symmetrie beobachtet, welche durch die TMS hervorgerufen wird und folglich nicht bei kleinen Wellenlängen zu beobachten ist
Peterman, Derrick W. "Control of chaos in thin films at ferromagnetic resonance /". The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu148793458997678.
Pełny tekst źródłaWheeler, May Catherine. "Manipulation of fullerene C60 spintronic devices via ferromagnetic resonance". Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/8258/.
Pełny tekst źródłaMcCullian, Brendan Andrew. "Detection of Ferromagnetic Dynamics Using NV Centers in Diamond". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1585664864822124.
Pełny tekst źródłaMa, Changlin. "Ferromagnetic resonance studies of DC magnetron sputtered CO-CR films". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26444.
Pełny tekst źródłaScience, Faculty of
Physics and Astronomy, Department of
Graduate
Sherratt, Sarah L. "Characterisation of iron oxide corrosion products using impulse ferromagnetic resonance". Thesis, Keele University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518314.
Pełny tekst źródłaBurgei, Wesley Alan. "Ferromagnetic Resonance Study of Square-Array Antidot Permalloy Thin Films". Miami University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=miami1059192138.
Pełny tekst źródłaDu, Chunhui. "Probing Spin Dynamics and Transport using Ferromagnetic Resonance based Techniques". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437066082.
Pełny tekst źródłaO'Dell, Ryan Andrew. "Resonant Ferromagnetic Absorption and Magnetic Characterization of Spintronic Materials". University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533043360679487.
Pełny tekst źródłaBraybrook, Julian Hugh. "Effects of paramagnetic and ferromagnetic particles on magnetic resonance (MR) imaging". Thesis, University of Cambridge, 1989. https://www.repository.cam.ac.uk/handle/1810/250949.
Pełny tekst źródłaOfstad, Johannes. "Ferromagnetic Resonance Spectroscopy Studies of Permalloy/Copper/Chromium/Copper thin films". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24417.
Pełny tekst źródłaHussain, A. A. "Spin wave and ferromagnetic resonance studies on single crystal nickel films". Thesis, University of York, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354383.
Pełny tekst źródłaGueye, Mouhamadou. "Magnetic thin films on flexible substrates : magnetomechanical study by ferromagnetic resonance". Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD007/document.
Pełny tekst źródłaThin films deposited on flexible substrates have been widely studied in the last decades due to the numerous applications in flexible electronics. Recently, flexible electronics have been extended to magnetic materials leading to the so-called emerging feld of flexible magnetoelectronics which is actually at the cutting-edge of spintronics research topics.This thesis is devoted to the study magnetomechanical properties of magnetic thin films (Ni, NiFe, Co2FeAl, CoFeB, FeCuNbSi) on flexible substrates. Structural analysis have 130 Abstracts hown that the Ni and CFA films are found to be polycrystalline with no strong preferred orientations ; the CFB film is amorphous. Consequently, the elastic and magnetoelastic properties are isotropic. For the study of the magnetomechanical properties, a set-up based on a jointly use of deformation test (bending or piezoactuation), ferromagnetic resonance (FMR) and digital image correlation (DIC) have been developped. Thanks to this method, it is possible to follow the evolution of the inescapable residual anisotropy encountered in magnetic thin films on flexible substrates under deformation and to determine the effective coefficient of magnetostriction of the films (sometimes unknown).This residual anisotropy is ascribed to contrasted mechanical strength when a sti thin film is deposited on a compliant substrate. The effect of the annealing temperature on the elastic and magnetoelastic have been studied carefully in CFB validating then theinterest on such alloys for spintronics applications. Finally, we have employed FMR inits sweep frequency mode to study the effective evolution of magnetization direction as function of the voltage-induced strains. A 90-degree magnetization rotation in Co2FeAl thin film on Kapton® polyimide substrate is observed
Zhang, Zhenyong. "Ferromagnetic resonance study in exchange coupled magnetic/"non-magnetic" multilayer structures /". The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487856076413539.
Pełny tekst źródłaBhat, Vinayak S. "A Study of Periodic and Aperiodic Ferromagnetic Antidot Lattices". UKnowledge, 2014. http://uknowledge.uky.edu/physastron_etds/25.
Pełny tekst źródłaSoares, Gabriel 1988. "Competição entre anisotropias perpendiculares em bicamadas de CoCrPt/Ni resolvida por ressonância ferromagnética". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276925.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Desde a descoberta dos filmes finos magnéticos com anisotropia perpendicular, ou PMAs (Perpendicular Magentic Anisotropy, em inglês), se tornou possível aumentar drasticamente a densidade de dados em discos rígidos. Uma maneira de continuar a incrementar a densidade final de dados seria desalinhar o eixo de anisotropia uniaxial e o campo magnético de escrita. Para isso, necessita-se de materiais com anisotropia magnética intermediária, i.e, na qual o seu eixo fácil está entre a longitudinal ao plano e a sua perpendicular. A situação ótima seria com o eixo fácil a 450, teoricamente dobrando a densidade final. No entanto, fabricar grãos ou filmes com esta propriedade não é viável do ponto de vista industrial. Todavia, bicamadas podem ser utilizadas para imitar este comportamento, onde um filme com anisotropia longitudinal é depositado sobre um PMA. Além do mais, esta abordagem apresenta a possibilidade de maior velocidade de escrita. Bicamadas de CoCrPt/Ni podem ser utilizadas para este propósito, com a camada de CoCrPt como PMA e a de Ni com anisotropia longitudinal. O experimento de ressonância ferromagnética permite, a priori, resolver as contribuições de anisotropia de cada camada no sistema de bicamadas, juntamente com os mecanismos de amortecimento magnético. O objetivo principal desta dissertação de mestrado é introduzir os conceitos de experimentação e teoria desta técnica, e aplicá-los nas bicamadas de CoCrPt/Ni. Neste trabalho foram utilizados filmes já depositados por sputtering com 10 nm de Co66Cr22Pt12, seguidos de 5 a 40 nm de Ni, para investigar o efeito da camada com anisotropia longitudinal sobre o PMA. Um outro conjunto de amostras contém um espaçador de Ti entre as camadas magnéticas, a fim de se estudar a interação na interface entre elas. Os experimentos de ressonância foram realizados em varredura de frequência num analisador de rede vetorial com campos magnéticos aplicados longitudinais ou perpendiculares e numa cavidade de banda X (9,54GHZ) em função da orientação do campo aplicado. Foi verificado qualitativamente o decréscimo da energia de anisotropia longitudinal com menores espessuras de Ni nas bicamadas. No entanto, não foi possível observar a linha de absorção da camada de CoCrPt, e consequentemente, encontrar unequivocamente as constantes de anisotropia do sistema, muito menos confirmar o comportamento multiaxial encontrado. Não obstante, foi confirmado a natureza de curto alcance da interação entre as camadas. Nova experimentação em outras bandas de frequência é necessária, afim de identificar a absorção do CoCrPt. Uma perspectiva futura interessante é o estudo da largura de linha e o amortecimento magnético do sistema devido a interação envolvida
Abstract: Since the advent of perpendicular magnetic anisotropy media, or PMAs, it was possible to greatly enhance the data density of hard drives. A method to push forward the data density increase is to misalign the anisotropy and applied field axes. This can be achieved by tilted media, i.e., in which the anisotropy axis lays somewhere between in-plane (IP) and out-of-plane (OOP). The optimal condition is with the axis tilted by 45\textsuperscript{0}. However, produce this kind of material is not practible at industrial scale. Thus, composite media can be used to mimic this behavior, where an in-plane anisotropy media is deposited on top of a PMA. Nonetheless, this approach allows to reach faster switching rates. CoCrPt/Ni bilayers may be used for this purpose, with the CoCrPt serving as the PMA and the Ni as the IP anisotropy layer. The ferromagnetic resonance experiment (FMR) can be used to obtain information about the magnetic anisotropy, being able to characterize its constant for each layer in the bilayer system, together with the damping mechanisms. Therefore, the main goal of this master thesis is to introduce the FMR theory and experimentation and apply them in this system. The used films were already deposited by sputtering with 10 nm of Co.66Cr.24Pt.12 under a 5 to 40 nm Ni layer. Another set of samples with a Ti layer between the magnetic layers provides information of the interface coupling. The FMR experiments were partly performed in a broadband vector network analyzer (VNA) with applied magnetic fields IP or OOP, and in a X-band (9,54 GHz) cavity as function of the orientation of the applied magnetic field. It was qualitatively verified a decrease of the longitudinal magnetic anisotropy energy as a function of the Ni thickness in the bilayer system. However, the CoCrPt single layer absorption could not be observed, making it impossible to unequivocally identify each anistropy constant. Nonetheless, the short-range nature of the coupling was confirmed. Further experimentation in higher frequencies is needed in order to find the CoCrPt absorption. Also, promising effects in the damping mechanism due to the coupling are expected
Mestrado
Física
Mestre em Física
2013/1186360
CAPES
Adur, Rohan. "Magnetic Coupling and Relaxation at Interfaces Measured by Ferromagnetic Resonance Spectroscopy and Force Microscopy". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406120604.
Pełny tekst źródłaLawson, Graham Richard. "Swept frequency absorption in particulate magnetic materials". Thesis, Manchester Metropolitan University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296486.
Pełny tekst źródłaHiebert, Wayne Kevin. "Ferromagnetic resonance in a permalloy microstructure using time resolved scanning Kerr effect microscopy". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0006/MQ28942.pdf.
Pełny tekst źródłaRodan, Steven. "Nuclear magnetic resonance and specific heat studies of half-metallic ferromagnetic Heusler compounds". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-198412.
Pełny tekst źródłaOgrin, Feoder. "Ferromagnetic resonance studies of cobalt films and cobalt based multilayers produced by MOCVD". Thesis, Keele University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362165.
Pełny tekst źródłaLiutyi, Taras Volodymyrovych, Тарас Володимирович Лютий, Тарас Владимирович Лютый i O. M. Hryshko. "Magnetic and Mechanical Resonance of a Single Ferromagnetic Nanoparticle in a Viscous Fluid". Thesis, Sumy State University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/64155.
Pełny tekst źródłaKarube, Kosuke. "Ferromagnetic critical behavior and critical universality in itinerant-electron metamagnet UCoAl". 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199086.
Pełny tekst źródłaHattori, Taisuke. "Spin-Triplet Superconductivity Induced by Ferromagnetic Fluctuations in UCoGe". 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188471.
Pełny tekst źródłaJohansson, August. "Interlayer exchange coupling in Co/Pd-NiFe films studied by Vector Network Analyser Ferromagnetic Resonance". Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/interlayer-exchange-coupling-in-copdnife-films-studied-by-vector-network-analyser-ferromagnetic-resonance(cdb5170e-aa10-43ef-86c7-f61cf8a187f9).html.
Pełny tekst źródłaTrindade, Gonçalves Francisco José. "Engineering of demagnetisation fields in exchange biased antidots studied using ferromagnetic resonance and Lorentz microscopy". Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6875/.
Pełny tekst źródłaBack, Markus. "Out-of-plane Ferromagnetic Resonance (FMR) measurements on magnetic nanoparticle dispersions for biomedical sensor applications". Thesis, Uppsala universitet, Fasta tillståndets fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-410179.
Pełny tekst źródłaWei, Yajun. "Ferromagnetic Resonance as a Probe of Magnetization Dynamics : A Study of FeCo Thin Films and Trilayers". Doctoral thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-247238.
Pełny tekst źródłaElster, Lars. "Magnetic resonance in superconducting junctions". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY042/document.
Pełny tekst źródłaIn this thesis we investigate the possibility to change the charge current in superconducting junctions by manipulating the spin properties using magnetic resonance. We consider two different junctions: First, an unconventional Josephson junction between a conventional s-wave superconductor and an unconventional px-wave superconductor and second a half-metal/conventional superconductor junction. The spx junctions hosts two spin-polarized Andreev bound states, which are 2pi-periodic, giving rise to a spontaneous magnetization in equilibrium. This opens the possibility to manipulate the occupations of the Andreev levels using a time-dependent magnetic field. We show that the field induces coherent Rabi oscillations between different spin states of the junction that appear as resonances in the current-phase relation. For a cicularly polarized magnetic field, we find a spin selection rule, giving Rabi oscillations only in a certain range of superconducting phase differences, which provides a spin detection scheme. In contrary, for a linear polarization, there is no spin constraint on the Rabi oscillations. The field also induces non-coherent transitions including continuum states that act as refill and ionization processes for the Andreev levels. For a circularly polarized field, these field-induced processes do not provide a decay mechanism for Rabi oscillations, due to spin and energy constraints. For a linear polarization, the width of the Rabi resonances in the current-phase relation is determined by the field-induced ionization processes. In the half-metal/conventional superconductor junction no Andreev current may flow for a static magnetization direction, since the perfect spin polarization of the half-metal forbids Andreev reflection processes at the interface. We show that an Andreev current flows, if the half-metal is subject to ferromagnetic resonance. The precessing magnetization direction in the half-metal provides the necessary spin-flip mechanism. The current is driven by the precession of the magnetization direction that creates a non-equilibrium situation for the charge carriers. We also show for a point contact geometry that in a ferromagnet with non-zero minority carrier concentration the current is reduced and vanishes at equal minority and majority carrier concentrations. Additionally, we consider a more realistic, extended interface geometry. For a ballistic junction, the current is enhanced compared to a point contact geometry due to the larger number of transport channels. Furthermore, we show that disorder is most important in the ferromagnet. The Andreev current through the disordered junction is much larger than the current through a ballistic junction in the same geometry
Wittmann, Angela Dorothea Anshi. "Spin currents in organic semiconductors". Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/290148.
Pełny tekst źródłaKaster, Brian C. "Magnetic Properties of Co1-xFexS2". Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1311874514.
Pełny tekst źródłaKhanal, Shankar. "Study of Static and Dynamic Properties of Magnetic Nanostructures". ScholarWorks@UNO, 2017. http://scholarworks.uno.edu/td/2382.
Pełny tekst źródłaManago, Masahiro. "Enhancement of Spin-Triplet Superconductivity by Pressure-Induced Critical Ferromagnetic Fluctuations in UCoGe". Kyoto University, 2019. http://hdl.handle.net/2433/242592.
Pełny tekst źródłaMarkó, Daniel. "Magnetostatics and Dynamics of Ion Irradiated NiFe/Ta Multilayer Films Studied by Vector Network Analyzer Ferromagnetic Resonance". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-64289.
Pełny tekst źródłaIn dieser Dissertation ist der Einfluss von Ionenbestrahlung auf die magnetostatischen und dynamischen Eigenschaften von weichmagnetischen Py/Ta-Einzel- und Multilagen (Py = Permalloy: Ni80Fe20) untersucht worden, wobei das Hauptziel gewesen ist, eine Methode zur Bestimmung der Sättigungsmagnetisierung zu finden. Sowohl polare magneto-optische Kerr-Effektmessungen (MOKE) als auch ferromagnetische Resonanzmessungen mittels eines Vektornetzwerkanalysators (VNA-FMR) haben sich als geeignet erwiesen, um µ0MS zu bestimmen, wobei das Problem des unbekannten effektiven magnetischen Volumens umgangen wird, welches bei der Verwendung von Techniken wie SQUID oder VSM auftreten würde. Unter der Voraussetzung, dass die Proben keinen senkrechten magnetischen Anisotropiebeitrag besitzen, kann die Sättigungsmagnetisierung selbst im Fall starker Grenzflächendurchmischung infolge einer großen Anzahl an Py/Ta-Grenzflächen und/oder Ionenbestrahlung mit hohen Fluenzen bestimmt werden. Ein weiterer wesentlicher Bestandteil dieser Arbeit ist die Konstruktion eines VNA-FMR-Spektrometers gewesen, welches vollautomatisiert ist, polare und azimutale Winkelabhängigkeiten messen kann und einen Magneten besitzt, der Proben, die Eisen beinhalten, sättigen kann. Von Grund auf beginnend umfasste dies zahlreiche Schritte wie z. B. die Entwicklung eines geeigneten koplanaren Wellenleiterdesigns sowie das Schreiben von Steuerungs-, Auswertungs- und Fitprogrammen. Mit steigender Fluenz und Zahl an Py/Ta-Grenzflächen ist eine Abnahme der Sättigungsmagnetisierung beobachtet worden. Im Fall der 10×Py-Proben findet diese bereits bei kleinen Fluenzen statt. Im Gegensatz dazu bleibt µ0MS der 1×Py- und 5×Py-Proben bis zu einer bestimmten Fluenz konstant, bevor sie sich dann umso schneller verringert. Die Bestrahlung mit Ne-Ionen verursacht eine Durchmischung und Verbreiterung der Grenzflächen. Infolgedessen erfahren die Py/Ta-Proben bei einer kritischen Fluenz, die von der Zahl der Grenzflächen abhängig ist, einen Phasenübergang von polykristallin zu amorph. Die Sättigungsmagnetisierung verschwindet ab einer Ta-Konzentration von etwa 10–15 Atom-% in den Py-Schichten. Die Proben besitzen eine kleine uniaxiale Anisotropie, die praktisch unbeeinflusst von der Fluenz ist, sich jedoch mit steigender Zahl an Py/Ta-Grenzflächen leicht verringert. Neben den statischen sind auch die dynamischen magnetischen Eigenschaften der Proben untersucht worden. Der Gilbert-Dämpfungsparameter α erhöht sich sowohl mit steigender Zahl an Py/Ta-Grenzflächen als auch mit höheren Fluenzen, wobei Erstere einen größeren Einfluss hat. Die inhomogene Linienverbreiterung ΔB0 nimmt ebenfalls mit steigender Zahl an Py/Ta-Grenzflächen zu, verringert sich jedoch bei größeren Fluenzen leicht
Ruane, William Terrence. "Controllable Spin Wave Generation with Spatially Dependent Magnetic Fields and Their Detection Using Ferromagnetic Resonance Force Microscopy". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524171463673634.
Pełny tekst źródłaBechtel, Kyle A. "MAGNETIC RESONANCE IN THE PROXIMITY OF AN INSTABILITY: PERPENDICULAR RESONANCE IN PERMALLOY NEAR THE CRITICAL FIELD". Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1250281122.
Pełny tekst źródłaCiuciulkaite, 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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