Дисертації з теми "Layer magnetic oxide"
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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.
Повний текст джерелаBonholzer, 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.
Повний текст джерелаLeung, 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.
Повний текст джерелаHong, Yuanjia. "Magnetic and Transport Properties of Oxide Thin Films." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/615.
Повний текст джерелаSena, 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.
Повний текст джерелаPugh, 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.
Повний текст джерелаDhaka, 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.
Повний текст джерелаChaluvadi, 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.
Повний текст джерелаWe report a quantitative analysis of thickness dependent epitaxial strain-induced effects in La1-xSrxMnO3 (LSMO) (001) (x = 0.33) thin films of thicknesses (50, 25 and 12 nm) grown on various single crystal substrates such as SrTiO3 (STO) (001), STO buffered MgO (001), NdGaO3 (NGO) (110) and (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) (001) by Pulsed Laser Deposition (PLD) technique. We also report the composition dependent magnetic properties of LSMO thin films with x = 0.33 and 0.38 in particular grown onto LSAT (001) substrate by Molecular Beam Epitaxy (MBE). The study mainly includes measurements such as X-ray Diffraction (XRD), Atomic Force Microscopy (AFM), temperature dependent four-probe resistivity, magnetization properties by Superconducting Quantum Interference Device (SQUID), magnetic anisotropy by Magneto-Optical Kerr Magnetometry (MOKE). Our results highlight the detailed study of angular evolution and thickness dependent magnetic anisotropy, remanence, coercivity and switching field in epitaxial LSMO thin films. Temperature-dependent studies are also performed on few selected films. We will also discuss the cause of magnetic anisotropy in LSMO films i.e., magneto-crystalline and magnetostriction anisotropy and the effects of steps or substrate mis-cut induced anisotropy
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.
Повний текст джерелаMukherjee, 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.
Повний текст джерелаLenertz, 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.
Повний текст джерелаSkorupa, 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.
Повний текст джерелаSkorupa, 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.
Повний текст джерелаDiver, Andrew James. "The strongly correlated electron systems CeNiâ†2Geâ†2 and Srâ†2RuOâ†4." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364543.
Повний текст джерелаLamirand, 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.
Повний текст джерелаThis thesis deals with the determination of atomic, electronic and magnetic structure of ferromagnetic and antiferromagnetic ultrathin layers to better understand the mechanism of the exchange coupling which could takes place at their interface. Exchange coupling, expression of the interaction between the two materials, manifests itself by a shift of hysteresis loop and an increase in coercivity below the blocking temperature. We have paid attention to the systems of CoO/FePt on Pt(001), CoO/Fe and CoO/Fe3O4 on Ag(001). We combined experimental techniques mainly using synchrotron light to characterize them. As a first step, we optimized in a ultra-high vacuum (UHV) environment the elaboration of the systems looking for an appropriate surface, the high control of growth conditions and the supervision of the structure by in situ X-ray surface diffraction. The crystalline structure was precisely then detailed. As a second step, we studied the magnetic structure and properties ex situ by X-ray magnetic circular and linear dichroïsm and magneto-optic Kerr effect. The relation between exchange coupling and interface structure is discussed all along the manuscript
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.
Повний текст джерелаLiang, 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.
Повний текст джерела國立中興大學
材料科學與工程學系所
102
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 Co layers have little rock-salt CoO structures and cubic Co3O4. The magnetic properties of the films, Co layer bombarded with Argons for 10 minutes with a coercivity (Hc) ~ 105 Oe at room temperature. However, when the samples were field cooled (FC, Happ. = 12 kOe) to 180 K, the coercivity (Hc) down to 50 Oe. Further, no measurable exchange bias field (Hex) was present in these thin films. In the ZFC/FC results, the Co(21 %O2/Ar) layer the curves merge at ~ 320 K (irreversibility temperature, Tirr.), close to TN of CoO (~ 300 K). Second part, X-Ray Diffraction and Transmission electron microscopy have shown that the structure is body-centered cubic Fe phase and amorphous Si. The grain sizes ranging from 5-10 nm. The magnetic properties of the films, at room temperature or field cooled to 180 K the coercivity (Hc)6~9 Oe, and exchange bias field (Hex) 1~3 Oe. However, when the samples were field cooled to 10 K, the coercivity (Hc) enhanced 28~60 Oe in Si-oxide (8, 21, and 41%O2/Ar)/Fe bilayers. In the ZFC/FC results, the Si-oxide (8%O2/Ar)/Fe bilayer exhibited the presence of a maximum in the ZFC curve at ~ 70 K, irreversibility temperature, Tirr. ~ 390 K.
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.
Повний текст джерелаDepartment of Science and Technology (DST) India, Fellowship
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.
Повний текст джерела國立臺灣師範大學
物理學系
103
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 high oxygen pressure were better than in low oxygen pressure for shadow mask method. Raman spectroscopy only observed ZnO vibrational modes E_2(high) and E_2(low) in low oxygen pressure for shadow mask method. All films have E_2(low) and ZnO have stronger E_2(high) for two method in high oxygen pressure, however above Er 3at.%, fluorescent effect was observed for all films. PL spectra show near band gap(NBE) emission intensity decreased and defect luminescence emission(DLE) intensity increased with Er concentration increased . PL spectra emission consisted of near band gap(NBE), zinc vacancies and zinc interstitials in low oxygen pressure, however whose consisted of near band gap(NBE), zinc vacancies, zinc interstitials, oxygen vacancies, oxygen interstitials in high oxygen pressure. Magnetic investigations by SQUID showed no magnetism for pure ZnO thin film and paramagnetism for Er-doped ZnO thin films at T=300K and T=5K.
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.
Повний текст джерела國立臺灣師範大學
物理學系
101
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 concentration increases. The major defects are zinc vacancy and interstitial zinc. The room temperature m-H curves show that there is only hysteresis loop for 5.1% Gd, the rest show only paramagnetism.
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.
Повний текст джерела國立臺灣師範大學
物理學系
102
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 interstitial and antisite zine defect emissions, and the overall intensity increases monotonically with Ho density. The m-H curves show that all samples are paramagnetic at 5K and 300K.
Salehizadeh, Seyed Ali. "Encapsulation of iron oxide-based nanoparticles in silica for biomedical applications." Doctoral thesis, 2019. http://hdl.handle.net/10773/27748.
Повний текст джерелаNas últimas décadas grande atenção tem sido dedicada ao estudo de nanopartículas à base de óxido de ferro revestidas por materiais dielétricos orgânicos ou inorgânicos com potencial para aplicações biomédicas e na indústria de absorventes de microondas. O presente trabalho de doutoramento centra-se na fabricação de nanopartículas de óxido de ferro e no seu revestimento com sílica na forma de uma estrutura núcleo-casca com o objectivo de obter propriedades magnéticas e elétricas interessantes para aplicações práticas na área biomédica e na indústria de microondas. O estudo combinado das propriedades elétricas e magnéticas dos compósitos de óxido de ferro-sílica permitiu estudar as características para aplicações em nova geração de absorventes de micro-ondas de alta eficiência e também agentes com possíveis utilizações em hipertermia e libertação de drogas. Neste contexto foram utilizados, quatro métodos de síntese: método de sol-gel, técnica fusão de zona flutuante com laser (LFZ), autocombustão e método de Pechini na preparação dos compósitos à base de óxido de ferro / sílica. Vários estudos como caracterização estrutural, morfológica, elétrica e magnética, foram realizados nas amostras preparadas. A utilização de várias técnicas de caracterização experimental fornece um conhecimento abrangente das propriedades físicas destes materiais e permite perspectivar o possível emprego destes compósitos para aplicações biomédicas e como materiais absorventes de micro-ondas no futuro. Foi preparada a série de vidros xFe2O3- (100-x) SiO2 (x = 1, 2, 10, 20 em mol%) pelo método de rota sol-gel. O efeito das condições de tratamento térmico e da relação Fe / Si na morfologia, propriedades elétricas e magnéticas das cerâmicas vítreas foi investigado. Fibras com a composição 10Fe2O3-90SiO2 foram processadas pela técnica de LFZ. A sua morfologia, estrutura, propriedades magnéticas e estado de redução foram estudadas em função da taxa de extração da preparação das amostras. Foi realizada uma análise exaustiva dos resultados da espectroscopia de Raman e uma pesquisa da microestrutura magnética local para melhor interpretar as características magnéticas das fibras. Uma série de nanocompósitos de silício-ferrite de manganês com a composição xMnFe2O4- (100-x) SiO2 (x = 100, 20, 15 e 10 em % molar) foi preparada pelo método de auto-combustão. Foi realizada investigação das propriedades estruturais, morfológicas, elétricas e magnéticas destas amostras. Os parâmetros físicos obtidos a partir desse estudo mostraram o grande potencial dos nanocompósitos de silício-ferrita de manganês para as aplicações propostas assim como para o trabalho futuro sugerido. Além disso, também foi realizado um estudo preliminar sobre a síntese e caracterização do óxido de ferro pelo método de Pechini.A estrutura, as propriedades magnéticas, o mecanismo de condução elétrica das policristalitas de óxido de ferro preparados foram realizadas deixando em aberto outras possíveis aplicações industriais.
Programa Doutoral em Engenharia Física
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.
Повний текст джерелаMonti, 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.
Повний текст джерелаtext
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.
Повний текст джерела