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Dissertations / Theses on the topic 'Magneto-optical Kerr effect (MOKE)'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Tibaldi, Pier Silvio TIbaldi. "Flexible Time-Resolved Magneto-Optical Measurements." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304296.

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We present a time-resolved Kerr microscope, capable of measuring the magnetization dynamics of samples grown on transparent, double-side-polished substrates.The magnetization is excited by a current pulse, using a coplanar waveguide placed beneath the samples. The Kerr rotation is detected with the stroboscopic pump-probe technique, using a probing laser, synchronized with the current pulse.We report benchmark measurements of the time-resolved Kerr instrument for magnetization dynamics in thin permalloy and FePd films. The experimental results for ferromagnetic resonance peaks have been compar

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2

Tanaka, Hiroki. "Development of MOKE Spectrometer for Magneto-optical Studies of Novel Magnetic Materials and Quantum Structures." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226965026.

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3

Persson, Måns, and Filip Lindh. "Optimisation of measuring magneticproperties of micro-structuresusing the magneto-optic Kerr effect." Thesis, Uppsala universitet, Materialfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306118.

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Magnetic storage means storage of data using magnetised medium and is widespreadover the world today, especially in hard disk drives. Using this kind of storagerequires knowledge about these materials. A way to study thin magnetic materials isto use MOKE(magneto optical Kerr effect). A Moke-system is a setup to measure thinmagnetic films by shooting a laser and analyze the reflected beam.The purpose of this report is to document and if possible improve a MOKE-system,named HOMER. This includes temperature regulation, filters, amplifiers, opticalchopper, Helmholtz coils and a laser. HOMER was do

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4

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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5

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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6

Tanaka, Hiroki. "Zeeman Splitting Caused by Localized sp-d Exchange Interaction in Ferromagnetic GaMnAs Observed by Magneto-Optical Characterization." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1441982108.

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7

Bsawmaii, Laure. "Exaltation des différents effets magnéto-optiques à l’aide de réseaux résonants diélectriques basés sur un nano-composite magnétique obtenu par voie sol-gel." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES028.

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Les dispositifs photoniques magnéto-optiques (MO) sont l’objet d’une attention particulière pour leur capacité à améliorer la sensibilité des biocapteurs ou leur sensibilité au champ magnétique. Les effets MO, pouvant se manifester par une rotation de polarisation ou une modification d'intensité de la lumière sous champ magnétique, sont cependant plutôt faibles lors d’interactions simples (réflexion ou transmission) avec les films magnétiques classiques. Le dispositif proposé dans le cadre de ce travail permet d’exalter les effets MO. C’est une structure diélectrique planaire simple formée par

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8

Ball, David Klaus. "From 2D CoCrPt:SiO2 films with perpendicular magnetic anisotropy to 3D nanocones — A step towards bit patterned media —." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113029.

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Due to the ever-increasing worldwide consumption of memory for digital information, new technologies for higher capacity and faster data storage systems have been the focus of research and development. A step towards achieving higher data storage densities or magnetic recording media is the concept of bit patterned media, where the magnetic recording layer is divided up into magnetically isolated bit units. This approach is one of the most promising technologies for increasing data storage densities and could be implemented by nanostructuring the wafer. Therefore, the fabrication of the approp

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Ball, David Klaus. "From 2D CoCrPt:SiO2 films with perpendicular magnetic anisotropy to 3D nanocones — A step towards bit patterned media —." Doctoral thesis, Helmholtz-Zentrum Dresden-Rossendorf, 2012. https://tud.qucosa.de/id/qucosa%3A26882.

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Due to the ever-increasing worldwide consumption of memory for digital information, new technologies for higher capacity and faster data storage systems have been the focus of research and development. A step towards achieving higher data storage densities or magnetic recording media is the concept of bit patterned media, where the magnetic recording layer is divided up into magnetically isolated bit units. This approach is one of the most promising technologies for increasing data storage densities and could be implemented by nanostructuring the wafer. Therefore, the fabrication of the approp

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10

Markó, 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.

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In the present work, the implications of ion irradiation on the magnetostatic and dynamic properties of soft magnetic Py/Ta (Py = Permalloy: Ni80Fe20) single and multilayer films have been investigated with the main objective of finding a way to determine their saturation magnetization. Both polar magneto-optical Kerr effect (MOKE) and vector network analyzer ferromagnetic resonance (VNA-FMR) measurements have proven to be suitable methods to determine µ0MS, circumventing the problem of the unknown effective magnetic volume that causes conventional techniques such as SQUID or VSM to fail. Prov

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11

Pincelli, T. "PROBING ELECTRON CORRELATION DYNAMICS: A MULTI-TECHNIQUE STUDY APPLIED TO THE HALF-METALLIC OXIDE LA1-XSRXMNO3." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/543731.

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This thesis completes my work as doctoral student of the Scuola di Dottorato in Fisica, Astrofisica e Fisica Applicata at the Università degli Studi di Milano that has been carried out, starting in November 2014, mostly at the Laboratorio TASC of IOM-CNR in the premises of the Elettra - Sincrotrone Trieste and FERMI@Elettra infrastructures, in the framework of the NFFA and APE-beamline facilites, as well as by accessing international large scale infrastructures and laboratories. The activity has addressed the development of experimental methodologies and novel instrumentation oriented to the

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12

Besbas, Jean. "Influence de la densité de trous sur la dynamique des charges et de l'aimantation du (Ga, Mn)As en couche." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00798208.

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Ce travail étudie le rôle de la densité de trous à l'équilibre sur la dynamique des charges et de la norme de l'aimantation de (Ga,Mn)As pour des densités de manganèse et d'impuretés fixées indépendamment. Des expériences " pompe-sonde " mettent en relation les dynamiques de réflectivité et d'angle de rotation Kerr. Deux relaxations sont mises en évidence. La première traduit un échauffement variable du gaz de trous entre 1ps et 100ps. La seconde traduit une diffusion-recombinaison des charges entre 100ps et 1500ps et évolue en fonction du rapport entre extension spatiale d'états d'impuretés,

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13

Yuan, Hanming. "Magneto Optical Kerr Effect measurement of double exchange spring system." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527351.

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<p> Magnetic property of the symmetric Double Exchange Spring System, soft(S)/hard(H)/soft(S) ferromagnetic layers NiFe (Py)/SmFe/NiFe (Py), was investigated using Magneto Optical Kerr Effect (MOKE) measurement. Exchange spring magnet, H/S bilayer, shows a unique magnetic hysteresis curve due to the non-collinear magnetization developed by magnetic coupling of the two layers. In order to produce a symmetric non-collinearity in magnetization, the thicknesses of the two soft layers are controlled to be the same during the deposition. Due to the finite skin depth of MOKE measurement magnetic hyst

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14

Li, Wen. "Magneto-optical Kerr Effect Spectroscopy Study of Ferromagnetic Metal/Organic Heterostructures." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-64103.

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Diese Dissertation stellt die erste Anwendung des magneto-optischen Kerr Effektes (MOKE) auf ferromagnetische Metall/Organische Heterostrukturen zur Aufklärung der optischen und chemischen Eigenschaften dar. Die MOKE-Untersuchungen wurden spektroskopisch in einem Energiebereich von 1.7 eV bis 5.5 eV durchgeführt. Heterostrukturen, wie sie hier untersucht werden, sind relevant für Anwendungen in der organischen Spintronik. Die Auswertung der Experimentellen Daten wird unterstützt durch numerische Simulationen eines Schichtmodells und ergänzende Untersuchung der strukturellen und magnetischen Ei

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15

Kuszewski, Piotr. "Optical detection of magneto-acoustic dynamics." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS353.

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Ce travail se situe dans le contexte de l’utilisation des ondes de spin comme vecteur d’information. Il explore la possibilité d’exciter l’aimantation dans de fines couches ferromagnétiques grâce au couplage magnéto-élastique. Cela permettrait un adressage non-inductif, efficace, et distant des ondes de spin. Dans un premier volet, nous avons développé un dispositif expérimental générant des ondes acoustiques de surface (ODS) électriquement, verrouillées en phase à des impulsions de laser sonde. La dynamique d’aimantation est détectée grâce aux effets magnéto-optiques (Kerr et Voigt). Nous étu

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16

Eggers, Tatiana Marie. "Magneto-optical Kerr Eect Study of Magnetic Anisotropy in Soft Ferromagnets." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5471.

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The continued progress of modern information technology relies on understanding the influence of magnetic anisotropy on magnetic thin films. In this work, two sources of magnetic anisotropy are examined in two different soft ferromagnets: a uniaxial anisotropy induced during the fabrication of Ni80Fe20 and exchange anisotropy, or exchange bias, which occurs at the interface of Ni77Fe14Cu5Mo4/Fe50Mn50 bilayer. A home-built Magneto-optical Kerr effect magnetometer is used to measure the magnetic response of the soft ferromagnetic films and details of its construction are also discussed. A simple

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17

Ngo, Kevin. "Magneto optical Kerr effect study of close packed array of cobalt nanostructures." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10254554.

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<p> Magnetic nanostructures have been subject of intense research as a result of their unique magnetic properties such as superparamagnetism, enhanced magnetic moment, and high magnetic density storage due to shape anisotropy. A highly reproducible and affordable method to fabricate cobalt nanostructures on silicon substrates was devised in this thesis using nanosphere lithography. The surface morphology and magnetic properties of the nanopatterned cobalt thin film were characterized using an optical microscope, scanning electron microscope, atomic force microscope, and a magneto optical Kerr

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18

Watarai, H. "Magneto-Optical Characterization of Binding Ability of Magnetic Nanoparticles in Solution." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42805.

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The magnetization profile of iron oxide magnetic nanoparticles (MNPs) and the binding ability of MNPs with metal ions in aqueous solutions were investigated by means of the magnetic linear dichroism (MLD) and the magneto-optical Kerr effect (MOKE) measurements. The ultra-visible MLD spectra of the non-modified and surface modified MNPs with -COOH showed a typical magnetization curve for a superparamagnetic particles. Also, the MLD spectra were changed drastically by the addition of dysprosium(III) ion and showed that MLD spectra can be used for the evaluation of metal-MNPs binding ability. Fu

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19

Wijngaard, Jan Hendrik. "Magnetic and magneto-optical properties of some transition metal compounds." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 1990. http://irs.ub.rug.nl/ppn/297971859.

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20

Pahirathan, Selvarajah. "Magneto-optical properties of multilayered systems and enhancement of the polar Kerr effect." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318781.

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21

Deeter, Merritt Norton. "Applications of the magneto-optical Kerr effect to studies of stratified magnetic media." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184557.

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Three applications of Smith's model of magneto-optical effects in stratified magnetic media are presented. Each application involves the incident-angle dependence of magneto-optical effects which Smith's model treats explicitly. In addition. the three applications address current issues in magnetic and magneto-optical recording. The first problem considered is that of nonmagnetic surface layers which form on magnetic recording heads. The second is a theoretical treatment of effects which arise in magneto-optical recording when high numerical-aperture optical systems are combined with media exh

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22

Goryo, Jun. "Impurity-induced polar Kerr effect in a chiral p-wave superconductor." American Physical Society, 2008. http://hdl.handle.net/2237/11263.

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23

Ciuciulkaite, Agne. "Investigation of articial spin ice structures employingmagneto-optical Kerr effect for susceptibility measurements." Thesis, Uppsala universitet, Materialfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-265171.

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Articial spin ice structures are two-dimensional systems of lithographically fabricated lattices ofelongated ferromagnetic islands, which interact via dipolar interaction. These systems have beenshown to be a suitable playground to study the magnetic, monopole-like, excitations, similar tothose in three-dimensional rare-earth pyrochlores. Therefore, such articial structures can be potentialmaterials for investigations of magnetricity [1]. The investigations of these articial spin icestructures stretches from the direct imaging of the magnetic congurations among the islands to indirectinvestiga

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24

Christiansen, David A. "Investigation of magnetic proximity effect in ferromagnet/superconductor thin films by low temperature Magneto Optical Kerr Effect measurement." California State University, Long Beach, 2013.

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25

Tveten, Erlend Grytli. "Optical coatings for enhancement of the longitudinal Magneto-optic Kerr Effect from magnetic ultra-thin films." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13266.

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The effect of optical coatings on the longitudinal magneto-optic Kerr effect response from 10 nm thin films of permalloy (Ni84Fe16) has been studied. Enhancement of the magneto-optic Kerr effect signal contrast of a factor 1.76 has been observed for P- polarized incident light on a trilayer configuration of aluminium, magnesium fluoride, and permalloy. A quadrilayer structure where the trilayer is overcoated with zinc sulphide enhances the signal contrast by a factor 4.05 for P-polarized light. The enhancement is also observed for S-polarized light, and is shown to be reproducible using nickel

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26

Jimenez, Nicholas M. "Implementation of Magneto Optical Kerr Effect Microscopy for the Observation of Magnetic Domain Structure in Thin Films." Thesis, California State University, Long Beach, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13425872.

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<p> The home built Magneto-Optical Kerr Effect (MOKE) microscope was implemented to probe the magnetic domain patterns of thin film samples. A CCD camera is introduced to the existing MOKE rotation measurement setup. The images captured by the camera are used to analyze the change in the magnetic domain patterns by the Kerr effect. Using 6.5× zoom lens and 1.33× extension tube attached to the CCD camera, the size of the sample down to a 1.02mm by 0.75 mm area can be viewed in the image capture. Magnetic hysteresis loop is first measured to investigate the magnetic switching behavio

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27

Balakireva, Irina. "Nonlinear dynamics of Kerr optical frequency combs." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2043.

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La présente thèse est consacrée à l’étude des peignes optiques de Kerr dans les résonateurs àmodes de galerie, au sein desquels la lumière peut être excitée par pompage externe. L’effet Kerrexistant dans ces résonateurs engendre des modes latéraux équidistants (dans le domaine spectral)de part et d’autre du mode excité, c’est à dire un peigne de fréquence. Cette thèse est diviséeen trois chapitres. Le premier est dédié à l’introduction de la génération de ces peignes et leurapplications. Le deuxième chapitre présente l’analyse de l’équation de Lugiato-Lefever, décrivantde manière analytique le

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Montgomery, Patrick D. "MAGNETO-OPTICAL PROPERTIES OF THIN PERMALLOY FILMS: A STUDY OF THE MAGNETO-OPTICAL GENERATION OF LIGHT CARRYING ANGULAR MOMENTUM." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/126.

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Magneto-optical materials such as permalloy can be used to create artificial spin- ice (ASI) lattices with antiferromagnetic ordering. Magneto-optical materials used to create diffraction lattices are known to exhibit magnetic scattering at the half- order Bragg peak while in the ground state. The significant drawbacks of studying the magneto-optical generation of OAM using x-rays are cost, time, and access to proper equipment. In this work, it is shown that the possibility of studying OAM and magneto-optical materials in the spectrum of visible light at or around 2 eV is viable. Using spectro

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29

Fumagalli, Paul. "Magneto-optical Kerr effect study on the high field superconductors Eu₁-xPbxMo₆S₈ and Eu₁-xSnxMo₆S₈-ySey /." Zürich, 1990. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9082.

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30

Zahradník, Martin. "Dynamic control of magnetization for spintronic applications studied by magneto-optical methods." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS155/document.

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Deux mécanismes importants reliant la préparation des couches ultraminces d’oxydes magnétiques à leurs propriétés physiques ont été étudiés dans ce travail. En premier lieu, l’influence de la contrainte épitaxiale sur les propriétés magnéto-optiques de la manganite La₂/₃Sr₁/₃MnO₃ (LSMO) a été étudiée. Les couches ultraminces ont été déposées par ablation laser pulsé sur quatre substrats différents, ce qui a fourni différentes valeurs statiques de la contrainte épitaxiale. Les propriétés magnétiques ont été révélées comme se détériorant avec l’augmentation de la contrainte, ce qui était prévisi

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31

Faulkner, Colm Charles. "Ga⁺ focused ion beam irradiated Ni₈₁Fe₁₉ thin films and planar nanostructures investigated by the magneto-optical Kerr effect." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3055/.

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Patterned magnetic films are of interest for storing and sensing information, and possible logic applications, and find commercial applications in consumer goods such as personal computers. This thesis addresses the fast magnetic patterning of capped ultrathin Ni(_81)Fe(_19) films in Chapter 5, and the patterning and controlled magnetic switching of planar nanowires in Chapter 4. Controlled domain wall switching of complex wire geometries with comer structures, artificial trapping sites, 3-terminal junctions and more complex wire circuits is described in Chapters 6-7.The magnetic switching of

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32

Conlon, Jay S. "Upgrading the Magneto-optical Kerr Effect Apparatus to Determine Polar Component of Magnetization in Py/SmCo/Si Thin Films." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10786227.

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<p> In this study, magneto-optical Kerr effect (MOKE) is measured on magnetic thin-film samples composed of permalloy (Py) and samarium-cobalt (SmCo) on a silicon substrate with 102 A of Py, but varying thicknesses of SmCo (344 to 1146 A ). This is done to see the effects of SmCo layer thickness on the magnetic switching of top Py layer. A new optical element, a photoelastic modulator (PEM), is introduced to the existing MOKE system and allows for the measurement of the Kerr ellipticity of the samples. Longitudinal and polar components of magnetization were analyzed from Kerr ellipticity hyste

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Проценко, Сергій Іванович, Сергей Иванович Проценко, Serhii Ivanovych Protsenko, et al. "Magneto-optical Properties of Spin-Valve Systems on the Basis of Au/Fe/Au/Co/Si." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35104.

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This paper presents the results of investigation of magneto-optical Kerr effect in pseudo spin-valve systems on the basis of Fe, Co and Au. The significant dependence of coercetivity on such parameters as relative position of ferromagnetic layers, their thicknesses and surface morphology was shown. The investigation was carried out with AFM and TEM methods. Coercitivity value is greater for Au(3)/Fe(3)/Au(6)/Co(20)/SiO2/Si system. This is explained with different transitional metals growth mechanisms on the substrate and on non-magnetic layer and with more varied surface morphology of fil

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Phelps, Gretchen. "MAGNETO-OPTICAL EFFECTS AND PRECISION MEASUREMENT PHYSICS: ACCESSING THE MAGNETIC FARADAY EFFECT OF POLARIZED ³HE WITH A TRIPLE MODULATION TECHNIQUE." UKnowledge, 2014. http://uknowledge.uky.edu/physastron_etds/15.

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This work is comprised of the study of two magneto-optical phenomena: the Kerr effect and the Faraday effect. Neutron physics experiments often utilize polarized neutrons, and one method to generate or guide polarized neutrons involves the use of a system of magnetic super-mirrors. Experience shows that the magnetization of the super-mirror may decay with time; therefore, we implemented the surface magneto-optical Kerr effect (SMOKE) to study the temporal behavior of the magnetization of a magnetized remnant super-mirror sample, where a sensitivity of 0.1 mrad was obtained. Unique to our set-u

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Silva, Edimilson F?lix da. "Efeito Kerr magneto-?ptico; Resson?ncia ferromagn?tica; Acoplamento bilinear; Acoplamento biquadr?tico." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16605.

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Made available in DSpace on 2014-12-17T15:14:57Z (GMT). No. of bitstreams: 1 EdimilsonFS_DISSERT.pdf: 2546760 bytes, checksum: 08525df56e96d75f8d221757342883b4 (MD5) Previous issue date: 2012-02-17<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>In this work, we investigated the magnetic properties of a monocrystalline Fe thin film and of Fe(80 ?)/Cr(t)/Fe(80 ?) tri-layers, with the nonmagnetic metallic Cr spacer layer thickness varying between 9 ? < t < 40 ?. The samples were deposited by the DC Sputtering on Magnesium Oxide (MgO) substrates, with (100) crystal orientation

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Gon?alves, Charlie Salvador. "Montagem e constru??o de um magnet?metro a efeito Kerr magneto-?ptico." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16624.

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Made available in DSpace on 2014-12-17T15:15:00Z (GMT). No. of bitstreams: 1 CharlieSG.pdf: 1382454 bytes, checksum: 2b54a2a0dcd81f1ca374af1328ff8c73 (MD5) Previous issue date: 2006-03-15<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>n this master s dissertation a Kerr Magneto Optic s magnetometer effect was set up to do characterization of samples type films fine and ultra thin, these samples will be grown after the implementation of the sputtering technique at the magnetism laboratory of of this department. In this work a cooled electromagnet was also built the wat

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Kang, Kyongha. "Crystalline structure, and magnetic and magneto-optical properties of MnSbBi thin films." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365438.

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Tufaile, Adriana Pedrosa Biscaia. "Efeito Kerr magneto-óptico espectral e sperimagnetismo de filmes amorfos de terra rara-Co." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-05072012-171055/.

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Observamos o comportamento espectral do efeito Kerr transversal, para filmes amorfos de terra rara - cobalto na região do espectro visível e ultravioleta próximo (comprimento de onda, , entre 325 nm e 670 nm), onde o sinal magnetoóptico apresentou um máximo na região azul do espectro. Concluímos que, para esta região espectral, a variação relativa de refletividade é proporcional à magnetização do cobalto e a constante de proporcionalidade depende da composição da liga e do comprimento de onda da luz. Desenvolvemos uma técnica de modulação de fase, própria para medir o efeito Kerr transversal

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Wu, Jing. "Optical pump-probe studies of spin dynamics in ferromagnetic materials." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364427.

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Terschlüsen, Joachim A. "Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281298.

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This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy reso

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Frazier, Matthew Allen. "Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28935.

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The goal of this project was to study some unexplored optical and magneto-optical properties of the newest member of III-V ferromagnetic structures, InMnSb, as well as InSb films and InSb/AlInSb quantum wells. The emphasis was on dynamical aspects such as charge and spin dynamics in order to address several important issues of the spin-related phenomena. The objectives in this project were to: 1) understand charge/spin dynamics in NGS with different confinement potentials, 2) study phenomena such as interband photo-galvanic effects, in order to generate spin polarized current, 3) probe the eff

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Henn, Tobias [Verfasser], and Wolfgang [Gutachter] Ossau. "Hot spin carriers in cold semiconductors : Time and spatially resolved magneto-optical Kerr effect spectroscopy of optically induced electron spin dynamics in semiconductor heterostructures / Tobias Henn. Gutachter: Wolfgang Ossau." Würzburg : Universität Würzburg, 2015. http://d-nb.info/1102829730/34.

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Nontapot, Kanokwan. "Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28712.

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In recent years, spin relaxation, injection, and manipulation in semiconductors have attracted considerable interest because of several potential applications in "spintronic" devices and the necessity to understand and control spin-based phenomena. In light of the growing interest in spin-related phenomena and devices, there is now renewed interest in the science and engineering of narrow gap semiconductors (NGS). NGS based heterostructures are particularly interesting for spintronic applications due to their large spin-orbit coupling, which leads to considerable zero-field spin splitting. NG

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Fronk, Michael. "Charakterisierung von dia-, para- und ferromagnetischen dünnen Schichten mittels magnetooptischer Kerr-Effekt-Spektroskopie." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-61755.

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Die polare magnetooptische Kerr-Effekt-Spektroskopie (MOKE) wird in dieser Arbeit zum ersten Mal zur Charakterisierung paramagnetischer Schichten eingesetzt. Die Schichten bestehen aus Phthalocyanin-Molekülen (H2Pc, VOPc, MnPc, CoPc und CuPc), die sich als Modellsystem zur Untersuchung des Einflusses des Molekülzentrums auf die elektronischen Zustände eignen. Die optischen Konstanten und die Dicken der Schichten werden mittels Ellipsometrie bestimmt. Mithilfe eines optischen Schichtmodells wird aus den Ellipsometrie- und MOKE-Daten die Voigt-Konstante, ein magnetooptischer Materialparameter, b

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Halagacka, Lukas. "Theoretical and experimental study of novel integrated magnetoplasmonic nanostructures." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112279/document.

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Ce travail porte sur l’exaltation de l’effet magnéto-optique (MO) Kerr transverse induite par des «résonances extraordinaires» dans un réseau d’or périodique 1D déposé sur un oxyde de grenat magnéto-optique. La structure complète incluant le réseau métallique 1D a été conçue, simulée numériquement, dimensionnée, fabriquée puis caractérisée. Un algorithme de type RCWA (Rigorous Coupled Wave Algorithm) adapté au calcul parallèle a été développé et utilisé d’une part pour l’étude théorique des modes résonants dans les réseaux magnétoplasmoniques et d’autre part pour l’analyse des données de mesur

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Jung, Young Woo. "Optical studies and biological applications of spins in semiconductors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306523724.

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Plšek, Radek. "Měření vlastností tenkých vrstev metodami zobrazovací reflektometrie a Kerrova jevu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227912.

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This thesis is divided into three main sections that deal with optical and magnetic thin films properties and their measurements techniques. Principles of the spectroscopic reflectometry and measurements of optical properties are described in the first part. Results of imaging reflectometry are most important. This technique is based on in situ monitoring of optical properties of SiO2 thin films during etching over the area cca 10 × 13 mm2. In next section magnetic properties of thin films and new apparatus built on the Institute of Physical Engineering of BUT are shown. Magnetic properties we

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Schoenmaker, Jeroen. "Desenvolvimento de um microscópio óptico e magnetoóptico de varredura em campo-próximo." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26052009-102436/.

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Para o desenvolvimento da nanociência atual há forte demanda por equipamentos capazes de caracterizar sistemas em escalas da ordem nanométrica. Este contexto impulsionou o desenvolvimento de microscópios ópticos de varredura em campopróximo (Scanning Near-field Optical Microscope SNOM). Diferentemente da microscopia óptica tradicional, os SNOMs detectam a radiação eletromagnética evanescente e, conseqüentemente, a resolução não é limitada pelo critério de Rayleigh. No Laboratório de Materiais Magnéticos IFUSP desenvolvemos um SNOM sensível a efeitos Kerr magnetoópticos (MO-SNOM). Dessa mane

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Федченко, Олена Вікторівна, Елена Викторовна Федченко та Olena Viktorivna Fedchenko. "Структурно-фазовий стан і магнітооптичні властивості плівкових систем на основі Fe, Co, Cr та благородних металів". Thesis, СумДУ, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33736.

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Дисертацію присвячено комплексному дослідженню структурно-фазового стану, магніторезистивних і магнітооптичних властивостей плівкових систем та спін-вентильних структур на основі Fe, Co, Cr та Ag або Au. У роботі визначені оптимальні умови формування плівкових систем та досліджені процеси фазоутворення в них при відпалюванні. Визначені оптимальні загальні концентрації компонент у двошарових системах Fe/Cr (cCr = до 20 ат. %) та Fe/Co (cCo = до 22 ат. %), які забезпечують термічно стабільні, ізотропні та максимальні за величиною магнітні характеристики. Проведені розрахунки коефіцієнтів дифуз

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Демиденко, Максим Геннадійович, Максим Геннадьевич Демиденко та Maksym Hennadiiovych Demydenko. "Магніторезистивні та оптичні властивості спін-вентильних систем на основі Со, Fe, Cr і Cu та наночастинок оксидів Fe". Thesis, Вид-во СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/29099.

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Дисертація на здобуття наукового ступеня кандидата фізико-математичних наук за спеціальністю 01.04.01 – фізика приладів, елементів і систем.– Сумський державний університет, Суми, 2012. Дисертацію присвячено комплексному дослідженню магніторезистивних і оптичних властивостей спін-вентильних та наноструктурованих приладових систем на основі плівок Co, Fe, Cr і Cu (Au) та наночастинок оксидів Fe. У роботі вивчено фазові перетворення та умови формування дво- та тривимірних ансамблів наночастинок, встановлено взаємозв’язок між особливостями структурно-фазового стану та магніторезистивними і оптич

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