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Rozprawy doktorskie na temat „Layer magnetic oxide”

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Data publikacji: 6 września 2023

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1

Ol’khovik, L. P., Z. I. Sizova, E. V. Shurinova, K. A. Mozul', and A. S. Kamzin. "Influence of the BaFe12O19 Crystal Surface on the Interparticle Magnetic Interaction." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35188.

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The influence of the physicochemical state of the particle surface on the interparticle magnetic interaction in a closepacked system of singledomain microcrystals of highly anisotropic hexaferrite BaFe12O19 has been studied. The efficiency of the used technique of treatment of the particle surface with acid and alkali solutions has been determined from the data on the Fe3+ ion concentration in the solution and on the change in the elemental composition in the nearsurface layer. It has been shown that, when the etched layer thickness is 2.5c (c is the lattice parameter of ferrite), the par
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Bonholzer, Michael. "Magnetic Tunnel Junctions based on spinel ZnxFe3-xO4." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-212756.

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Die vorliegende Arbeit befasst sich mit magnetischen Tunnelkontakten (magnetic tunnel junctions, MTJs) auf Basis des Oxids Zinkferrit (ZnxFe3-xO4). Dabei soll das Potential dieses Materials durch die Demonstration des Tunnelmagnetowiderstandes (tunnel magnetoresistance, TMR) in zinkferritbasierten Tunnelkontakten gezeigt werden. Dazu wurde ein Probendesign für MTJs auf Basis der „pseudo spin valve“-Geometrie entwickelt. Die Basis für dieseStrukturen ist ein Dünnfilmstapel aus MgO (Substrat) / TiN / ZnxFe3-xO4 / MgO / Co. Dieser ist mittels gepulster Laserabscheidung (pulsed laser deposition, P
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Leung, Gong Wai. "Magnetic semiconducting oxide thin films and heterostructures by pulsed laser deposition." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609286.

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Hong, Yuanjia. "Magnetic and Transport Properties of Oxide Thin Films." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/615.

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My dissertation research focuses on the investigation of the transport and magnetic properties of transition metal and rare earth doped oxides, particularly SnO2 and HfO2 thin films. Cr- and Fe-doped SnO2 films were deposited on Al2O3 substrates by pulsed-laser deposition. Xray- diffraction patterns (XRD) show that the films have rutile structure and grow epitaxially along the (101) plane. The diffraction peaks of Cr-doped samples exhibit a systematic shift toward higher angles with increasing Cr concentration. This indicates that Cr dissolves in SnO2. On the other hand, there is no obvi
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Sena, S. P. "An investigation of some magnetic oxides grown by pulsed laser deposition." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287655.

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Pugh, Peter Rupert Thomas. "Brillouin Light Scattering studies of magnetic thin films and multilayers." Thesis, University of Salford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365952.

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Dhaka, Anita [Verfasser], Jürgen [Akademischer Betreuer] Kirschner, Wolf [Akademischer Betreuer] Widdra, and Andreas [Akademischer Betreuer] Berge. "Stress and magnetic properties of epitaxial ferromagnetic layers and ferromagnetic-transition metal oxide bilayers / Anita Dhaka. Betreuer: Jürgen Kirschner ; Wolf Widdra ; Andreas Berge." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2012. http://d-nb.info/1025352041/34.

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Chaluvadi, Sandeep kumar. "Influence of the epitaxial strain on magnetic anisotropy in LSMO thin films for spintronics applications." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC248/document.

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Nous présentons une étude des effets de contrainte induits par l’épitaxie dans des couches minces La1-xSrxMnO3 (LSMO) (001) (x = 0.33) pour 3 épaisseurs de films (50, 25 et 12 nm) déposés par Ablation Laser Pulsée (PLD) sur différents substrats tels que SrTiO3 (STO) (001), STO buffered MgO (001), NdGaO3 (NGO) (110) et (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) (001). L’étude est complétée par l’effet de la composition sur les propriétés magnétiques de couches minces de La1-xSrxMnO3 avec x=0,33 et 0,38 déposées par Epitaxie à Jets Moléculaires (MBE). Des caractérisations par diffraction de rayons X (XRD)
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9

Iorga-Pavel, Adina. "Evolution of Fe-Ti-V oxides from the main magnetite layer, Upper Zone, Bushveld Complex, South Africa: a comparison across the Western, Northern and Eastern Lobes." Thesis, Rhodes University, 2017. http://hdl.handle.net/10962/7357.

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The Main Magnetite Layer (MML) from the Northern, Eastern and Western lobes of the Bushveld Complex shows significant differences in textures and in mineral chemistry. The MML in the Eastern and Western lobes is massive, with rare, small and altered pyroxene inclusions. By contrast, the MML in the Northern Lobe is more heterogeneous, and it is made of anastomosed and sometimes imbricated, thin layers of magnetitite, magnetite-rich and silicate-rich rocks, where the inclusions in Ti-magnetite are more numerous and consist of mainly altered subhedral and anhedral plagioclase. The comparison of t
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10

Mukherjee, Devajyoti. "Growth and Characterization of Epitaxial Thin Films and Multiferroic Heterostructures of Ferromagnetic and Ferroelectric Materials." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3622.

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Multiferroic materials exhibit unique properties such as simultaneous existence of two or more of coupled ferroic order parameters (ferromagnetism, ferroelectricity, ferroelasticity or their anti-ferroic counterparts) in a single material. Recent years have seen a huge research interest in multiferroic materials for their potential application as high density non-volatile memory devices. However, the scarcity of these materials in single phase and the weak coupling of their ferroic components have directed the research towards multiferroic heterostructures. These systems operate by coupling th
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11

Lenertz, Marc. "Propriétés structurales et magnétiques de cobaltites de types CoV2O6 à structure unidimensionnelle avec un intérêt potentiel pour la spintronique." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01063444.

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Le but de ce travail de thèse est de réaliser des vannes de spin " naturelles " constituées d'un matériau unique. Le matériau en question doit contenir une alternance de feuillets magnétiques et non magnétiques et présenter différents états magnétiques. Ce système modèle ne présenterait alors ni d'inter diffusion ni de rugosité aux interfaces magnétiques/non-magnétiques et pourrait constituer un système modèle pour les études des phénomènes de transport dépendant de spin. Le CoV2O6 est un oxyde polymorphe de basse dimensionnalité. Les deux phases (α et γ) présentent chacune plusieurs plateaux
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Skorupa, Wolfgang, and Gerhard Brauer. "HeT-SiC-05International Topical Workshop on Heteroepitaxy of 3C-SiC on Silicon and its Application to Sensor DevicesApril 26 to May 1, 2005,Hotel Erbgericht Krippen / Germany- Selected Contributions -." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28591.

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This report collects selected outstanding scientific and technological results obtained within the frame of the European project "FLASiC" (Flash LAmp Supported Deposition of 3C-SiC) but also other work performed in adjacent fields. Goal of the project was the production of large-area epitaxial 3C-SiC layers grown on Si, where in an early stage of SiC deposition the SiC/Si interface is rigorously improved by energetic electromagnetic radiation from purpose-built flash lamp equipment developed at Forschungszentrum Rossendorf. Background of this work is the challenging task for areas like microel
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Skorupa, Wolfgang, and Gerhard Brauer. "HeT-SiC-05International Topical Workshop on Heteroepitaxy of 3C-SiC on Silicon and its Application to Sensor DevicesApril 26 to May 1, 2005,Hotel Erbgericht Krippen / Germany- Selected Contributions -." Forschungszentrum Rossendorf, 2005. https://hzdr.qucosa.de/id/qucosa%3A21685.

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This report collects selected outstanding scientific and technological results obtained within the frame of the European project "FLASiC" (Flash LAmp Supported Deposition of 3C-SiC) but also other work performed in adjacent fields. Goal of the project was the production of large-area epitaxial 3C-SiC layers grown on Si, where in an early stage of SiC deposition the SiC/Si interface is rigorously improved by energetic electromagnetic radiation from purpose-built flash lamp equipment developed at Forschungszentrum Rossendorf. Background of this work is the challenging task for areas like microel
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Diver, Andrew James. "The strongly correlated electron systems CeNi←2Ge←2 and Sr←2RuO←4." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364543.

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15

Lamirand, Anne. "Croissance épitaxiale, structure atomique et couplage d'échange de bicouches ultra-minces d'oxydes sur métaux." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY032/document.

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Ce travail de thèse porte sur la détermination de la structure atomique, électronique et magnétique de couches ultraminces ferromagnétique et antiferromagnétique pour une meilleure compréhension du mécanisme de couplage d'échange qui peut avoir lieu à leur interface. Le couplage d'échange, effet de l'interaction entre les deux matériaux, se manifeste par un décalage du cycle d'hystérésis et une augmentation de la coercivité en-dessous de la température de blocage. Nous avons porté notre attention sur les systèmes de CoO/FePt sur Pt(001), CoO/Fe et CoO/Fe3O4 sur Ag(001) et combiné des technique
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16

Chun-YingChen and 陳俊頴. "The magnetic, optical and electrical effect of GaN based light emitting diode with CoZnO diluted magnetic oxide conducting layer." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68498233646305191937.

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Liang, Hsin-Te, and 梁信德. "The effects of ion-beam bombardment on microstructures and magnetic properties of the Co single layer and Si-oxide/Fe bilayers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55188815101928095278.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>102<br>In this study, we investigated of two part, (i) the Co layer when its surface was bombarded using an End-Hall ion source with an ion beam made with different ratios of Ar ions and oxygen ions (8 - 41% O2/Ar), and (ii) the Fe layer coupled to different capping layers (Si and Si-oxide). First part, thin Co-oxide layers were formed due to intermixing at the interfaces between Co and CoO created via the energetic oxygen ion-beam bombardment. Results have shown that the structure is face-centered cubic Co phase and amorphous Al. In the oxygen ion-beam bombarded
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Pal, Sukanya. "Raman Studies of Topological Crystalline Insulator, Natural Heterostructures, Excitonic Insulator and Layered Oxide Under Pressure." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5824.

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The theme of this thesis is Raman spectroscopic study of a variety of exotic states of matter under extreme conditions, such as, hydrostatic pressure as high as 25 GPa and a wide temperature range from 77 K to 390 K. Raman spectroscopy and in some cases, X-ray diffraction studies were performed on systems such as; Topological Crystalline Insulator (TCI) SnTe, normal semiconductor SnSe, natural van der Waals heterostructures from the (SnTe)m(Bi2Te3)n (with m = 1 and n = 1, 2) homologous family, which are also predicted to be Topological Insulators (TI), then Excitonic Insulator (EI) Ta2NiSe5, a
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Chou, Kai-Chieh, and 周楷傑. "Study of Zinc Erbium Oxide Thin Grown by Pulsed-Laser Deposition :Structural, Optical, and Magnetic Properties." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/z9v3vj.

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碩士<br>國立臺灣師範大學<br>物理學系<br>103<br>Pulsed-laser deposition (PLD) was applied to grow erbium(Er)-doped ZnO thin films on c-sapphire substrate under two different oxygen pressures : 3×〖10〗^(-3) and 3×〖10〗^(-1) mbar by using shadow mask or silver glue. XPS analysis showed Er/Zn ratio of target was close to thin film which was calculated by using Er ion area. X-ray diffraction spectrum showed decreasing crystal quality of ZnO and increasing c-axis lattice constant with increasing Er doping concentration in two oxygen pressures for both methods. The overall crystal quality of Er-doped ZnO films in hi
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密修誌. "Study of Zinc Gadolinium Oxide Thin Flims Grown by Pulsed-Laser Deposition: Structural, Optical, and Magnetic Properties." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/fd45z2.

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碩士<br>國立臺灣師範大學<br>物理學系<br>101<br>In this thesis, Gadolinium (Gd)-doped ZnO (Zn1-xGdxO) thin films were grown on c-sapphire by pulsed-laser deposition. The nominal Gd concentration is between 0% and 20%. The XRD patterns show that there is no secondary phase, and c-lattice constant decreases with increasing Gd density. Only one weak ZnO oscillation mode was observed from Raman spectroscopy because the thickness of the thin films is sm-aller than 300nm. Photoluminescence spectroscopy at different temperatures showed a slight decrease in band gap and increase in defect emissions as Gd concentra
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Tsai, Cheng-You, and 蔡承佑. "Study of Zinc Holmium Oxide Thin Films Grown by Pulsed-Laser Deposition: Structural, Optical, and Magnetic Properties." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/9jh6w9.

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碩士<br>國立臺灣師範大學<br>物理學系<br>102<br>Pulsed-laser deposition (PLD) was applied to grow holmium-doped ZnO (Ho:ZnO) thin films on c-sapphire substrate with different holmium(Ho) concentrations. The Ho doping concentration ranges between 3% and 30%. The oxygen pressure of crystal growth is 3×10-2 mbar and the substrate temperature is 750℃.Half of the samples are thermally annealed treatment at 650℃ for an hour. The Raman-scattering spectroscopy reveals that there is no secondary phase except Zn0.95Ho0.05O after annealing. Photoluminescence spectra of most of the samples consist of zine vacancy、zine i
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Salehizadeh, Seyed Ali. "Encapsulation of iron oxide-based nanoparticles in silica for biomedical applications." Doctoral thesis, 2019. http://hdl.handle.net/10773/27748.

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Over last decades, a great attention has been devoted to iron oxide-based nanoparticles coated by dielectric organic or inorganic materials for the potential contributions in biomedical applications and microwave absorbers industry. The present Ph.D. study focuses on the fabrication of iron-based oxide nanoparticles and coating the particles within the silica matrix in the form of a core-shell structure exhibiting interesting magnetic and electrical properties for application in the biomedical and microwave technology areas. The combined study of electrical and magnetic properties of the sili
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Jalili, Helia. "Materials physics of half-metallic magnetic oxide films by Pulsed Laser Deposition: Controlling the crystal structure and near-surface properties of Sr2FeMoO6 and CrO2 films." Thesis, 2009. http://hdl.handle.net/10012/4243.

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The idea of half-metallic ferromagnets was first introduced by de Groot et al. in 1983 based on their calculations. The density of state at the Fermi level for half-metallic ferromagnet is completely polarized, meaning that only one of the spin up or spin down channel exists and has metallic behaviour while the other spin channel behaves as a semiconductor or insulator. This unusual electronic structure can be seen in different materials including Sr2FeMoO6, CrO2 and Mn-based Heusler alloys. The high spin polarization degree of the half-metallic ferromagnets makes them a perfect candidate to
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Monti, Mark Charles. "The effect of epitaxial strain and R³+ magnetism on the interfaces between polar perovskites and SrTiO₃." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3231.

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We have embarked on a systematic study of novel charge states at oxide interfaces. We have performed pulsed laser deposition (PLD) growth of epitaxial oxide thin films on single crystal oxide substrates. We studied the effects of epitaxial strain and rare-earth composition of the metal oxide thin films. We have successfully created TiO₂ terminated SrTiO₃ (STO) substrates and have grown epitaxial thin films of LaAlO₃ (LAO), LaGaO₃ (LGO), and RAlO₃ on STO using a KrF pulsed excimer laser. Current work emphasizes the importance of understanding the effect of both epitaxial strain and R³+ magnetis
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Jungbauer, Markus. "Gestaltung der elektronischen Korrelationen in Perowskit-Heterostrukturen auf atomarer Skala." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-8695-C.

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Zur Präparation von hochwertigen Heterostrukturen aus Übergangsmetallperowskiten wurde eine Anlage zur metallorganischen Aerosol-Deposition mit Wachstumskontrolle durch in-situ Ellipsometrie aufgebaut. Durch numerische Anpassung der in-situ Ellipsometrie kann man den beim Wachstum stattfindenden Transfer der $ e_{g} $-Elektronen zwischen unterschiedlich dotierten Perowskit-Manganaten erfassen. Im Verlauf des Wachstums von Übergittern aus $ \mathrm{LaMnO_{3}} $ (LMO) und $ \mathrm{SrMnO_{3}} $ (SMO) variiert die Längenskala, über die die $ e_{g} $-Elektronen delokalisieren, in einem Bereich von
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