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Dissertations / Theses on the topic 'Magneto-optical garnet'

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Published: 17 September 2022
Last updated: 31 July 2025

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1

Kahl, Sören. "Bismuth iron garnet films for magneto-optical photonic crystals." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3711.

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<p>The thesis explores preparation and properties of bismuthiron garnet (BIG) films and the incorporation of BIG films intoone-dimensional magneto-optical photonic crystals (MOPCs).</p><p>Films were prepared by pulsed laser deposition. Weinvestigated or measured crystallinity, morphology,film-substrate interface, cracks, roughness, composition,magnetic coercivity, refractive index and extinctioncoefficient, and magneto-optical Faraday rotation (FR) andellipticity. The investigations were partly performed onselected samples, and partly on two series of films ondifferent substrates and of differ
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2

Sanches, Piaia Monica. "Femtosecond magneto-optical four-wave mixing in Garnet films." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE024/document.

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Un des objectifs du Femtomagnetisme est de contrôler l’aimantation des matériaux avec des impulsions laser femtoseconde. Il a été démontré qu’une réponse magnéto-optique (MO) cohérente a lieu avant la thermalisation des populations de spins dans une configuration pompe-sonde MOKE. Elle résulte du couplage cohérent spin-photon dû à l’interaction spin-orbite. Une description simplifiée de cet effet a été faite en tenant compte d’un système à huit niveaux couplés au champ laser. La cohérence MO est définie par le temps de déphasage dépendent du champ T2MO. Dans ce travail, il est montré que la ré
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3

Yao, Situ. "Preparation and Magneto-optical Effect of Ferrite-based Composites and Thin Films." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215554.

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4

Tomita, Satoshi, Takeshi Kato, Shigeru Tsunashima, Satoshi Iwata, Minoru Fujii, and Shinji Hayashi. "Magneto-Optical Kerr Effects of Yttrium-Iron Garnet Thin Films Incorporating Gold Nanoparticles." American Physical Society, 2006. http://hdl.handle.net/2237/8878.

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5

Teggart, Brian Joseph. "Fabrication, characterisation and magneto-optical enhancement of thin film BiGa : Dy iron garnet." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287432.

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6

DiBiccari, Anders Owen. "Sol-gel processing of RxY3-xAlyFe5-yO12 magneto-optical films." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/36458.

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The goal of this research was the fabrication of thin films with magneto-optic (MO) properties. Accomplishment of this task was achieved via sol-gel processing of rare-earth and aluminum substituted yttrium-iron garnet (RxY3-xAlyFe5-yO12, R,Al:YIG), where R= Bi, Gd, Er, Ho. Detailed are the processing conditions, parameters and results leading to R,Al:YIG films with MO response. Success was attained with a 0.25M Gd,Al:YIG solution spin coated for 120 seconds at 3500rpm onto a (111) gadolinium gallium garnet (GGG) substrate and calcinated at 900°C for 4 hours. Samples were characterized via
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7

Sohlström, Hans. "Fibre Optic Magnetic Field Sensors Utilizing Iron Garnet Materials." Doctoral thesis, KTH, Signaler, sensorer och system, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48332.

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This thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. Such materials exhibit a large Faraday rotation which make them advantageous for application in compact mag­netic field sensors. After an introduction, in which fibre optic sensors and optical methods to measure electric current are reviewed, the original research work is summarized. A system for the measurement of the magneto-optic properties of trans­parent materials is described. Measurement results, showing the influence of temperature, magnetic field direction and sample treatment on
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8

Alam, Mohammad. "High performance magneto-optic garnet materials for integrated optics and photonics." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/528.

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This work explores the preparation, characteristics and properties of highly bismuth (Bi) substituted, metal doped, iron garnet compounds and investigates their potential for various emerging applications in the visible and near infrared spectral regions. Bi-substituted iron garnet and garnet-oxide nanocomposite films of generic composition type (Bi, Dy/Lu)3(Fe, Ga/Al)5O12 are prepared by using a radio frequency (RF) magnetron sputtering technique. The physical properties (crystallinity, film morphology, optical absorption spectra across the visible spectral range and the elemental composition
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9

Dzibrou, Dzmitry. "Complex Oxide Photonic Crystals." Licentiate thesis, KTH, Microelectronics and Applied Physics, MAP, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11068.

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<p>Microphotonics has been offering a body of ideas to prospective applicationsin optics. Among those, the concept of photonic integrated circuits (PIC’s) has recently spurred a substantial excitement into the scientific community. Relisation of the PIC’s becomes feasible as the size shrinkage of the optical elements is accomplished. The elements based on photonic crystals (PCs) represent promising candidacy for manufacture of PIC’s. This thesis is devoted to tailoring of optical properties and advanced modelling of two types of photonic crystals: (Bi<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>/Sm
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10

Ibrahim, Noor Baa'yah. "Properties of yttrium iron garnet thin films grown by pulsed laser ablation deposition." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343112.

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11

Soumah, Lucile. "Pulsed Laser Deposition of Substituted thin Garnet Films for Magnonic Applications." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS042/document.

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Ce travail de doctorat porte sur la croissance par ablation laser pulsée de films ultrafins de Grenat de Fer et d’Yttrium dopés au Bismuth (BiYIG). Ces films d’épaisseur nanométriques sont caractérisés puis utilisés pour des applications magnon-spintroniques. Cette thèse englobe deux thématiques différentes de la physique : la science des matériaux et les applications magnon-spintroniques.La motivation de cette thèse repose sur le besoin, venant de la communauté magnon-spintronique, d’un nouveau matériau magnétique ultrafin à anisotropie ajustable. En effet, au court des dernières années, une
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12

Nadinov, Issatay. "Fonctionnalisation de fibres optiques par des grenats pour les applications magnéto-optiques." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE051.

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Mon projet de thèse est consacré à la fonctionnalisation d'une fibre optique par un grenat d'yttrium / fer substitué bismuth (Bi: YIG) pour les applications à la détection magnéto optique (MO) utilisant l’effet Faraday. Au cours de ce travail, j'ai développé une méthode originale pour réaliser la synthèse de grenats directement à l’extrémité d’une fibre optique, préparés par la méthode de décomposition métallo organique (MOD). J'ai étudié les propriétés MO et les propriétés structurelles (DRX, SEM, AFM) du matériau en fonction des conditions de préparation. Les résultats ont montré une forte d
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13

Joudrier, Anne-Laure. "Hybridation fonctionnelle par transfert de films magnéto-optiques sur guide." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0139.

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Cette étude cherche à réaliser une nouvelle structure intégrée, dite « hybride », ayant un rôle d'isolateur optique. Cette structure est composée d'un substrat de verre contenant un guide d'onde passif créé par échange d'ions, et sur lequel est reporté un film de grenat magnéto-optique, matériau choisi du fait de son fort effet Faraday. Cependant de fortes contraintes technologiques imposent de réaliser les différentes étapes de façon indépendante. La croissance de la couche de grenat est effectuée par épitaxie en phase liquide en dehors de la contrainte thermique liée au guide. Le grenat est
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14

Beran, Lukáš. "Studie optických a magnetooptických vlastností ferrimagnetických granátů pro fotonické a spintronické aplikace." Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-436352.

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Title: Optical and magneto-optical studies of ferrimagnetic garnets for photonic and spintronic applications Author: RNDr. Lukáš Beran Department: Intitute of Physics of Charles University Supervisor: RNDr. Martin Veis, PhD., Institute of Physics of Charles University Abstract: This doctoral thesis is devoted to fabrication and systematic char- acterization of physical properties of thin films of iron garnets with potential applications in photonic and spintronic devices. Investigated samples were pre- pared by metallo-organic decomposition and pulsed laser deposition. The study was focused on
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15

Šetina, Jan. "Optická a magnetooptická spektroskopie ultratenkých vestev ferimagnetických granátů." Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-447950.

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The aim of this master thesis is to prepare and systematically characterize two groups of ultra-thin films of iron garnets with different compositions and deposition conditions. The first set consists of approximately 10 nm thick samples of gallium-doped yttrium-iron garnet on gadolinium gallium garnet (Gd3Ga5O12) (GGG) substrates with different crys- tallographic orientations and different annealing temperatures. The second group con- tains gallium-bismuth-doped neodymium-iron garnet on GGG substrates. These samples have different thicknesses, the concentration of individual elements and diff
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