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Dissertations / Theses on the topic 'CoFeS2'

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Published: 4 June 2021
Last updated: 15 February 2022

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1

Kaster, Brian C. "Magnetic Properties of Co1-xFexS2." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1311874514.

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2

Manos, Orestis [Verfasser]. "Perpendicular magnetic tunnel junctions based on CoFeB and MnIr/CoFe with exchange bias / Orestis Manos." Bielefeld : Universitätsbibliothek Bielefeld, 2019. http://d-nb.info/1196642885/34.

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3

Wiese, Nils. "Coupling phenomena and scalability of CoFeB/Ru/CoFeB sandwiches." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=979729300.

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4

Pace, Rafael Domingues Della. "Estudo do Tunelamento em Junções Túnel de CoFeB=MgO=CoFeB." Universidade Federal de Santa Maria, 2011. http://repositorio.ufsm.br/handle/1/9213.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Magnetic tunnel junctions (MTJ) ofCoFeB=MgO=CoFeB and multilayers of (CoFeB=MgO)x3 were produced using the technique of magnetron sputtering, where the insulating film was grown in an atmosphere reactive Ar +O. Multilayers were produced on measures of X-ray difraction and magnetization. Junctions for transport measurements. All curves IxV, nonlinear, were measured at room temperature, and adjustments made using the Simmons model for symmetric barrier. Adjustments were made firt for the positive voltages and then to negative volta
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5

Pedroza, Roberto Carneiro. "Espectroscopia Raman em nanocompósitos de CoFe2 O4/SiO2 preparados pelo método Sol-Gel." reponame:Repositório Institucional da UnB, 2007. http://repositorio.unb.br/handle/10482/3357.

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Dissertação (mestrado)—Universidade de Brasília, Instituto de Física, 2007.<br>Submitted by Aline Jacob (alinesjacob@hotmail.com) on 2010-01-19T22:16:31Z No. of bitstreams: 1 2007_RobertoCarneiroPedroza.pdf: 4250004 bytes, checksum: 1fc376731fcc09d3bb89380a007a076e (MD5)<br>Approved for entry into archive by Joanita Pereira(joanita) on 2010-01-20T17:57:19Z (GMT) No. of bitstreams: 1 2007_RobertoCarneiroPedroza.pdf: 4250004 bytes, checksum: 1fc376731fcc09d3bb89380a007a076e (MD5)<br>Made available in DSpace on 2010-01-20T17:57:19Z (GMT). No. of bitstreams: 1 2007_RobertoCarneiroPedroza.pdf:
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6

Dohmeier, Niklas [Verfasser]. "Sensors for mechanical stress based on inverse magnetostrictive CoFeB/MgO/CoFeB tunnel junctions / Niklas Dohmeier." Bielefeld : Universitätsbibliothek Bielefeld, 2019. http://d-nb.info/119664411X/34.

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7

Mukherjee, Sankha S. "Realization of CoFeB/MgO/CoFeB magnetic tunnel junction devices through materials analysis, process integration and circuit simulation /." Online version of thesis, 2009. http://hdl.handle.net/1850/11336.

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8

Maire, Jean-Michel. "Etude de l'alliage cofecr elabore par electrolyse sous courants pulses." Besançon, 1998. http://www.theses.fr/1998BESA2046.

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L'augmentation des densites d'informations stockees sur les medias d'enregistrement magnetique requiert des tetes de lecture-ecriture, et donc des materiaux doux, de plus en plus performants. L'alliage cofecr, elabore par depot electrolytique sous courants pulses, a ete selectionne pour ses caracteristiques repondant aux criteres exiges pour le materiau magnetique de la tete, en particulier une tres forte aimantation a saturation et une resistivite elevee. Une etude des phenomenes electrochimiques mis en jeu lors du depot a permis d'optimiser les parametres intervenant sur la composition de l'
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9

Dieter, Sascha. "Mikrostruktur und magnetische Eigenschaften von CoFe-Ein- und CoFe-/SiO2-Viellagenschichten." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966020421.

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10

Azúa, Ríos Ximena. "Abriendo nuestros propios cofres: la escritura de las monjas coloniales en Chile." Tesis, Universidad de Chile, 2011. http://repositorio.uchile.cl/handle/2250/108715.

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11

DUBARRY, CHRISTOPHE. "Depot electrochimique de films magnetiques doux cofecu et comportement en atmosphere oxydante." Grenoble INPG, 2001. http://www.theses.fr/2001INPG0015.

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L'alliage cofecu (co, 10% fe, 5% cu), realise par depot electrochimique en courant continu, montre des proprietes magnetiques interessantes pour les applications (tetes d'enregistrement, micro-transformateur) necessitant un materiau magnetique doux a forte aimantation avec les caracteristiques suivantes : aimantation a saturation : bs = 20kgauss, coercitivite : hc < 1 oe (avant recuit), anisotropie : hk = 14 oe et permeabilite : a 10 mhz = 600. La caracterisation de cet alliage, texture 110 avec des grains relativement fins (15 nm), laisse paraitre une phase co de structure cubique a faces cen
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12

Lenoble, Marie-Anne. "Dépot électrolytique de CoFeCu, matériau magnétique doux de forte induction pour tetes magnétiques." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0156.

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L'alliage cofecu a ete choisi pour son aptitude a repondre aux criteres que doit remplir tout nouveau materiau magnetique doux des tetes magnetiques. Une etude electrochimique des phenomenes de depot, a permis de preciser les parametres operatoires qui influent sur la composition de l'alliage. Des depots sont d'abord realises sur de grandes surfaces pour les caracterisations magnetiques et structurales: un lien est etabli entre la composition donnant les proprietes optimales et la structure de l'alliage. Les depots dans des caissons de taille micronique pour les tetes magnetiques couches mince
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13

Zhang, Yu. "Edge Effects on Magnetic Proprieties of CoFeB-MgO Based Nanodevice." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS222/document.

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.La jonction magnétique à effet tunnel, noyau de la mémoire MRAM (magnetic random access memory), a suscité beaucoup d'intérêt pour les technologies de stockage et de traitement de l'information de faible puissance. Cette thèse se concentre sur l'influence de l'effet de bord pour les propriétés magnétiques des nanodispositifs. Deux nanostructures magnétiques typiques sont concernés: nanopiliers MTJ sous un processus spécial d'encapsulation, et nanodots magnétiques avec la même structure que la couche libre de pilier MTJ.Tout d'abord, nous développons le processus de fabrication complet pour na
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14

Magalhães, Juliana de Paiva. "Moçambique e Vale do Paraíba na dinâmica do comércio de escravos: diásporas e identidades étnocas, séc. XIX." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/8/8138/tde-29082011-105825/.

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Entre o fim do século XVIII e ao longo da primeira metade do XIX a África Centro-oriental contribuiu, de forma significativa, com mão-de-obra escrava para o desenvolvimento do capitalismo mundial. A maior parte dos africanos daí procedentes, vindos com destino ao Brasil, concentrou-se nas áreas cafeeiras da região sudeste, onde no final do século XVIII desenvolveu-se o núcleo cafeicultor inicial da capitania e, posteriormente, província de São Paulo. Durante as três primeiras décadas do século XIX, com a introdução maciça de escravos e o deslanche da produção cafeeira, a região do Vale do Para
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15

Sayed, Hassan Rodaina Pourroy Geneviève. "Intérêt du ferrite de cobalt dans les dispositifs magnétorésistifs Etude structurale et magnétique de bicouches CoFe2/CoFe2O4 élaborées par ablation laser /." Strasbourg : Université Louis Pasteur, 2007. http://eprints-scd-ulp.u-strasbg.fr:8080/750/01/sayed-hassan2006.pdf.

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16

Sayed, Hassan Rodaina. "Intérêt du ferrite de cobalt dans les dispositifs magnétorésistifs : Etude structurale et magnétique de bicouches CoFe2/CoFe2O4 élaborées par ablation laser." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/SAYED_HASSAN_Rodaina_2006.pdf.

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Le manuscrit présente une étude des propriétés structurales et magnétiques du système ferrimagnétique dur (CoFe2O4)/ferromagnétique doux (CoFe2) élaboré par ablation laser. On cherche à déterminer s'il est possible d'utiliser CoFe2O4 comme couche bloquante dans les dispositifs magnétorésistifs. Dans la première partie on détermine les conditions optimales d’élaboration du ferrite de cobalt. On étudie l’influence de l’énergie du laser et de l’atmosphère de dépôt sur les propriétés structurales et l’état de surface des couches déposées. On a obtenu des couches de CoFe2O4 de très faible rugosité,
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17

Meister, Wiebke [Verfasser], Peter [Akademischer Betreuer] Hildebrandt, and Holger [Akademischer Betreuer] Dobbek. "Mechanisms in biological electron transfer : raman spectroscopic investigations of cytochrome c and CoFeSP / Wiebke Meister. Gutachter: Peter Hildebrandt ; Holger Dobbek. Betreuer: Peter Hildebrandt." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1067386947/34.

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18

Chrischon, Dieivase da Silva. "Efeito do tratamento térmico na relaxação magnética de microfios amorfos de CoFeSiB recobertos por vidro." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/9223.

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Magnetoimpedance has been proved to be an excellent tool to study the magnetization dynamics and the ferromagnetic resonance (FMR) linewidth provides a convenient way for measuring damping parameters in magnetic materials. The FMR linewidth depends on intrinsic magnetic damping and additional magnetic inhomogeneities, but complete understanding of the origin of these damping parameters is still unaccomplished. Besides the fundamental physics interest, the study of damping term and magnetization dynamics is very important for the development of any device which has its physical effect associate
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19

Oliveira, Helena Dória Lucas de. "Entre mesadas, cofres e práticas matemáticas escolares : a constituição de pedagogias financeiras para a infância." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/21369.

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A presente investigação inscreve-se nos campos dos Estudos de Gênero e dos Estudos Culturais que se aproximam dos referenciais pós-estruturalistas, apoiados na teorização de Michel Foucault. Examino que pedagogias financeiras para a infância se constituem na articulação dos discursos da Educação Matemática com os discursos do senso comum, produzindo modos de lidar com dinheiro que educam crianças urbanas inseridas em processos de escolarização contemporâneos. Analiso práticas culturais implicadas no uso do dinheiro, relatadas em diários e entrevistas de crianças que cursavam a quarta série e a
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20

Rugerio, García Luis Ángel. "Cuantificación de antioxidantes contenidos en el café (cofeea arabica) verde y tostado procedente de Veracruz." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/67543.

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Se cuantificacan los compuestos fenólicos en el café verde y el café tostado con diferentes tratamientos.<br>El café (Coffea Arabica), es una planta, cuyos granos son ampliamente consumidos no solo en México sino en todo el mundo. A partir de la semilla o grano de café es posible preparar infusiones como tazas de café. Los granos de café contienen gran cantidad de compuestos con actividad biológica, que aportan benéficos a la salud para el ser humano cuando son consumidos, éstos son conocidos como compuestos fenólicos y taninos. Una etapa importante para preparar infusiones de café a partir de
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21

Fabre, Mathieu-Bhayu. "Manipulation et détection d'ondes de spin via l'interaction spin-orbite dans des guides d'ondes ultraminces Ta/FeCoB/MgO à anisotropie perpendiculaire." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY028/document.

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Les ondes de spin sont une des voies technologiques proposées pour surmonter les obstacles que rencontre la miniaturisation des complementary metal-oxide-semiconductor (CMOS) dans la gamme du nanomètre, comme en témoignent les derniers développements en matière de dispositifs logiques à ondes de spin. Cependant, l'attrait industriel de ces preuves de concept est conditionné par leur intégration évolutive à la technologie CMOS. Ici, nous présentons des pistes ultrafines de Ta/CoFeB/MgO utilisées comme guides d'ondes de spin. Ce système a été choisi pour sa compatibilité avec les procédés CMOS,
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22

Iamanaka, Beatriz Thie. "Avaliação da micobiota de grãos de café e dos metabolitos fungicos na qualidade da bebida." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255262.

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Orientador: Neura Bragagnolo<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-15T03:05:45Z (GMT). No. of bitstreams: 1 Iamanaka_BeatrizThie_D.pdf: 2489716 bytes, checksum: f28d257a6355ac8f3f2829d99d83a8be (MD5) Previous issue date: 2010<br>Resumo: O café passa por vários processos até chegar a ser consumido como bebida e vários fatores contribuem para a sua qualidade final, dentre eles a população microbiana presente. A contaminação dos grãos pelos microrgranismos é diversificada, envolvendo a participação d
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23

Harnchana, Viyada. "Transmission electron microscopy characterisation for development of CoFeB/MgO based magnetic tunnel junctions." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535675.

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24

Sharma, Apoorva [Verfasser], Dietrich R. T. [Gutachter] Zahn, Georgeta [Gutachter] Salvan, and Georgeta [Akademischer Betreuer] Salvan. "Correlation Between the Structural, Optical, and Magnetic Properties of CoFeB and CoFeB Based Magnetic Tunnel Junctions Upon Laser or Oven Annealing / Apoorva Sharma ; Gutachter: Dietrich R.T. Zahn, Georgeta Salvan ; Betreuer: Georgeta Salvan." Chemnitz : Technische Universität Chemnitz, 2021. http://d-nb.info/1232404357/34.

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25

Gumbar, Dziyana P. "Autobiographical subjectivity in Judith Ortiz Cofer's Silent dancing and Marjorie Agosín's The alphabet in my hands." Fairfax, VA : George Mason University, 2009. http://hdl.handle.net/1920/4567.

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Thesis (M.A.)--George Mason University, 2009.<br>Vita: p. 154. Thesis director: Ricardo F. Vivancos Pérez. Submitted in partial fulfillment of the requirements for the degree of Master of Arts in Interdisciplinary Studies. Title from PDF t.p. (viewed Oct. 12, 2009). Includes bibliographical references (p. 147-153). Also issued in print.
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Zhang, Xueying. "Le mouvement des parois des domaines magnétiques dans le fil de CoFeB induit par le courant polarisé." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS104/document.

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Cette thèse est consacrée aux recherches des propriétés statiques et dynamiques des parois de domaines magnétiques (DW pour Domain Wall) dans les nanofils CoFeB. Un système de mesure basé sur un microscope Kerr à haute résolution a été mis en place et utilisé pour ces recherches.Tout d'abord, les phénomènes liés à la tension interfaciale des parois ont été étudiés. La contraction spontanée des bulles de domaine a été observée directement en utilisant le microscope Kerr. Ce phénomène a été expliqué en utilisant le concept de la pression de Laplace due à l'énergie interfaciale des parois. L'éner
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Pandharpure, Shrinivas. "Process development for integration of CoFeB/MgO-based magnetic tunnel junction (MTJ) device on silicon /." Online version of thesis, 2007. http://hdl.handle.net/1850/5060.

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28

Schmitz, Virna Lúcia Coutinho. "De camaleão cultural a dragão transcultural: uma leitura de Silent dancing de Judith Ortiz Cofer." Universidade Federal de Juiz de Fora (UFJF), 2008. https://repositorio.ufjf.br/jspui/handle/ufjf/3455.

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Lallemand, Fabrice. "Dépôts électrolytiques d'alliages à base de cobalt-fer élaborés en présence d'additifs organiques : application aux revêtements magnétiques de CoFeCr." Besançon, 2003. http://www.theses.fr/2003BESA2026.

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Les matériaux magnétiques à forte aimantation à saturation possèdent de nombreuses applications dans le domaine de la micro-électronique. Afin de remplacer l'alliage Ni80Fe20, devenu obsolète, de nouveaux matériaux à base de cobalt-fer sont développés. Dans le but de modifier certaines propriétés des revêtements, il est souvent nécessaire d'ajouter dans l'électrolyte diverses substances organiques. L'additif, le plus couramment utilisé pour son rôle de brillanteur, est la molécule de saccharine. Le premier travail a donc été d'analyser l'influence de ce composé sur l'élaboration des revêtement
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Alves, Thiago Eduardo Pereira. "Síntese, caracterização e estudo das propriedades magnéticas e ópticas de óxidos nanoparticulados: CoFe2-xYxO4 produzido por reação de combustão e ZnO produzido por meio do método poliol." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8894.

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Schulz, Tomek [Verfasser]. "Spin transfer torques in the heavy metal/ferromagnet/oxide hetero-structure Ta/CoFeB/MgO / Tomek Schulz." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1173341242/34.

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32

Kai-ChiWu and 吳鎧齊. "Magnetism of CoFe2 O4 thin films and Proximity effect in Bi2 Se3-CoFe2 O4 bilayer structure." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04510307529923820624.

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33

Chung, Wen-Hao, and 鍾文豪. "Magnetoresistance Collapse effect on CoFeB/MgO/CoFeB Tunnel Junctions." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99fq86.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>103<br>Alternation of measurement temperature leads to magnetoresistance collapse of Co4Fe4B2/MgO/Co2Fe6B2 perpendicular magnetic tunnel junction will be researched in the paper from two aspects: 1. Co4Fe4B2(1.2)/MgO(1.5)/Co2Fe6B2(1.5) To begin with, samples have to be annealed to temperature of 300C and made into a rectangular cell in length of 10 um and width of 5 um to conduct room temperature hysteresis loop measurement and room temperature/ low temperature magnetoresistance measurement. In the specific range, we observe disappearance of MR ratio. Furthermore,
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34

Gannon, Shaun. "Durban based COFESA affiliated CMT clothing manufacturing firms : their upgrading opportunities." Thesis, 2002. http://hdl.handle.net/10413/4450.

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35

Shiue, Cheng-Hung, and 薛丞宏. "Studies of the Perpendicular Magnetic Coupling in CoFeB/Ta/CoFeB Structure." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/86528264764003737677.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>99<br>The perpendicular magnetic anisotropy has become a very important research field because the applications on high density magnetic recording media and magnetic random access memory. A recent report has revealed that CoFeB-MgO based structure may change the magnetic easy axis from in plane to the perpendicular direction if the thickness reduces less than ~1.5nm. In this thesis, we fabricated a synthetic antiferromagnetic structure, based on the perpendicular CoFeB-MgO structure, and did detailed magnetic characterizations of these novel multilayered structure
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Eilers, Gerrit. "Korrelationen zwischen struktureller Ordnung und elektrischen Transporteigenschaften in CoFeB|MgO|CoFeB Tunnelmagnetowiderstandselementen." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B4D9-2.

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37

LIN, YE-KAI, and 林燁凱. "Spin Hall Magnetoresistance in Perpendicular Magnetized MgO/CoFeB/TaRu/CoFeB/MgO Multilayers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/60429015137341095852.

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碩士<br>國立中正大學<br>物理系研究所<br>104<br>Applying a longitudinal current in heavy metal, such as Ta or Ru, a spin current is generated along the transverse direction due to the spin Hall effect (SHE). This spin current may further exert a torque on the adjacent ferromagnetic layer and causes a magnetic switching of the ferromagnetic layer. In this thesis, we fabricated thin film samples of synthetic antiferromagnetic structure: MgO(1)/CoFeB(1.2)/ Ta(x)Ru(1-x)(1)/CoFeB/MgO(1) (1<x<0, unit: nm) and measure the electrical and magnetic properties of these samples. The experimental work is divided into two
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Wiese, Nils [Verfasser]. "Coupling phenomena and scalability of CoFeB/Ru/CoFeB sandwiches / vorgelegt von Nils Wiese." 2006. http://d-nb.info/979729300/34.

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39

Yeh, Lin, and 葉霖. "Temperature driven magnetic phase transition in perpendicular MgO/CoFeB/Ta(Ru)/CoFeB/MgO." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69941039139921685998.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>101<br>In this thesis, we study the temperature-dependent magnetic behavior of [MgO/ Co20Fe60B20/Ta/Co20Fe60B20/MgO] and [MgO/Co20Fe60B20/Ru /Co20Fe60B20/MgO], which are either ferromagnetic-coupled or antiferromagnetic-coupled (synthetic ferrimagnet) structure, depending upon the spacer thickness, with perpendicular anisotropy. The experiments were divided into three sections: 1. Ta(10)/MgO(1)/Co20Fe60B20 (1.2)/Ta(1.3)/Co20Fe60B20 (1.2)/MgO(1)/Ta(3), annealed 300 oC, unit : nm This structure has weak antiferromagnetic coupling ~ 0.02 erg/cm2 between CoFeB layer
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王介平. "Study of Switching Mode of Magnetization in Synthetic Antiferromagnet of CoFeB/Ta/CoFeB." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04184625799766355023.

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碩士<br>國立彰化師範大學<br>物理學系<br>97<br>In this study, we use the synthetic antiferromagnet (SAF) of CoFeB(5 nm)/Ta(t nm)/CoFeB(5 nm) and changing the different nonmagnetic layer (Ta) thickness to discuss the RKKY oscillation behavior of the ferromagnetic coupling and the antiferromagnetic coupling. The ellipse dots are 500 nm and 800 nm ,and the L/W ratio of ellipse dots are 1, 1.5 and 2. We compare the switching mode of magnetization in the CoFeB monolayer, the ferromagnetic coupling of SAF structure and the antiferromagnetic coupling of SAF structure. The dot arrays are patterned in an area of 80 μ
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CHEN, YI-HSUAN, and 陳毅軒. "Current Induced Zero Field Switching in Perpendicularly Magnetized MgO/CoFeB/W/CoFeB/MgO." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9b68uq.

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碩士<br>國立中正大學<br>物理系研究所<br>106<br>A series of magnetic multilayered structures are fabricated by sputtering and the current induced magnetization switching by spin Hall effect is studied in this thesis. The samples include: Si(substrate)/Ta(10)/MgO(1)/CoFeB(x)/W(1)/CoFeB(1.1)/MgO(1)/Ta(3), x= 1.2, 1.3, 1.4 (units are nanometer). All samples are characterized by vibrating sample magnetometer (VSM) and the one with x= 1.4 is also measured by Hall resistance measurements. The anomalous Hall resistance (Rxy) measurements include the current scan Rxy(I) and field scan Rxy(H). The results of sample
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蔡慧敏. "Studies of spin-valve IrMn/CoFeB/Ta/CoFeB structure by Transmission electron microscopy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/64715691033457071444.

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碩士<br>國立彰化師範大學<br>物理學系<br>99<br>We have investigated the interlayer coupling in IrMn/CoFeB/Ta /CoFeB spin valve structure by using the tunnelling electron microscopy (TEM). In this study, we observe antifrerromagnetic coupling properties when Ta spacers are 0.92 nm and 1.30 nm. Then we fixed Ta thickness of 1 nm, and changed IrMn thickness to observe the exchange coupling between IrMn and bottom CoFeB. We find it still has pining effect until IrMn thickness greater than 14 nm. Thermal annealing process also has an influence on IrMn pinning effect. We investigate the exchange coupling in bottom
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Chiou, Chui-Xiang, and 邱垂翔. "Study of perpendicular magnetic anisotropy of doping Fe quantum dot in CoFeB/MgO/CoFeB." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/88603930045533983032.

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碩士<br>國立雲林科技大學<br>電子與光電工程研究所碩士班<br>101<br>This study focused on the system of magnetic tunnel junctions (MTJ) embedded with magnetic nanoparticles. By controlling the deposition rate and thickness of iron films, we obtained the small iron nanoparticles embedded within the MgO layer. The microstructures of the samples were measured by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The magnetic properties were measured by physical property measurement system (PPMS) and alternating gradient magnetometer (AGM). The samples of various thicknesses and annealing temperature
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CHEN, I.-CHENG, and 陳奕成. "Spin Hall Effect of perpendicular magnetic synthetic antiferromagnetic structure MgO/CoFeB/Ru/CoFeB/MgO." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70963635218901904376.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>103<br>Abstract We fabricated a coupled ferromagnetic structure of MgO/CoFeB/Ru/ CoFeB/MgO and studied current induced magnetic switching in this system. The exchange coupling between CoFeB layers is through the Ru spacer and the MgO layers on the side provide the interfacial perpendicular magnetic anisotropy (PMA). The thickness of each layer is given as: Sub/Ta(10)/MgO(1)/CoFeB(1.2)/Ru(2.2)/CoFeB(1.2)/MgO(1)/Ta(3) (all units: nm). The film is then etched into a Hall bar with width of 10 μm and length of 100 μm. The Hall resistance is measured by injecting a curren
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Xie, Bing-Ru, and 謝秉儒. "The temperature dependent magnetic characterization of Perpendicular magnetic synthetic antiferromagnetic MgO/CoFeB/Ru/CoFeB/MgO." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/30330881939814765090.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>103<br>Previous study has shown that ultrathin CoFeB/MgO based structure has strong perpendicular magnetic anisotropy due to Fe-O interface effect. However, the PMA disappears when Ru is used for the protection layer. In this study, we fabricated a symmetrical structure of MgO/CoFeB/Ru/CoFeB/MgO and found that PMA recovers if Ru thickness is thin enough.After detailed Ru-thickness and temperature-dependent measurements,we found an extra bulk crystalline anisotropy term and the overall anisotropy is determined by the competition between the interface anisotropy and t
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Eilers, Gerrit [Verfasser]. "Korrelationen zwischen struktureller Ordnung und elektrischen Transporteigenschaften in CoFeB-MgO-CoFeB-Tunnelmagnetowiderstandselementen / vorgelegt von Gerrit Eilers." 2009. http://d-nb.info/1008004073/34.

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Weng, Yi-chien, and 翁怡鍵. "The exchange coupling between ferromanetic layer in CoFeB/MgO/CoFeB tunnel structure with perpendicular magnetic anisotropy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/09230966250146087835.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>100<br>In this thesis we study the interlayer-exchange-coupling, as a function of the thickness of MgO spacer layers and the thickness of CoFeB, in the Co40Fe40B20/MgO/Co20Fe60B20 perpendicular magnetic tunnel junction structures. The main work is divided into two parts: (1) In Co40Fe40B20(1.2)/MgO(x)/Co20Fe60B20(1.2) structure (all units are in nm), the MgO thickness varies from 0.9 to 1.5 nm at annealing temper -atures are 225℃ and 255℃, respectively. We found that the coupling strength and sign (corresponded to par -allel or antiparallel coupling) varied depend
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Chen, Chien-Chang, and 陳建璋. "The Interface Exchange Coupling From In-plane to Perpendicular Configuration in MgO/CoFeB/Ru/CoFeB/MgO." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41608528783415637533.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>101<br>In this study, we fabricate a series of synthetic antiferromagnetic structures with Ru spacer by sputtering system : Ta(10)/MgO(1)/Co20Fe60B20(1.2)/Ru(x)/Co20Fe60B20(1.2)/MgO(1)/Ta(1), x=0.6~3, unit : nm. The oscillatory exchange coupling via Ru spacer is observed before and after annealing process. However, the magnetic easy axis is in the plane before annealing while the magnetic easy axis becomes perpendicular to the plane after annealing. For in-plane anisotropic films, the oscillatory period of ~ 1.2 nm and maximum coupling strength ~ 0.54 erg/cm2
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Chang, Hao-Ting, and 張浩庭. "The Study of Perpendicular Magnetic Anisotropy, Annealing Effect, Coupling Strength in MgO/CoFeB/Nb/CoFeB/MgO." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99253624247953377618.

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碩士<br>大葉大學<br>電機工程學系<br>101<br>In this study, we deposited MgO / CoFeB / Nb, Nb / CoFeB / MgO and MgO / CoFeB / Nb / CoFeB / MgO by sputtering and grew synthetic antiferromagnetic structure. These three structures were changed ferromagnetic or non-magnetic layer thickness of the material, and in the hysteresis curves measured after annealing to explore the perpendicular anisotropy and magnetic coupling. Studies have shown that the structure after annealing, which found that the perpendicular magnetic anisotropy (PMA) of the top structure only exist in a CoFeB thickness range from 1.2 to 1.6 nm
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Cheng, Tsung-I., and 鄭琮譯. "Study the interlayer exchange coupling in MgO/CoFeB/Nb(or Ru)/CoFeB/MgO structure with perpendicular anisotropy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/y67rkq.

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碩士<br>國立中正大學<br>物理學系暨研究所<br>100<br>In this thesis, we fabricate perpendicular synthetic antiferromagnetic structures by sputtering system, basing on the perpendicular CoFeB-MgO structure. The thesis is divided into two parts: 1. Ta(10)/MgO(1)/Co20Fe60B20(1.2)/Nb(x1)/Co20Fe60B20(1.2)/MgO(1) /Ta(1), x1＝0.5~3.5, unit：nm。 2. Ta(10)/MgO(1)/Co20Fe60B20(1.2)/Ru(x2)/Co20Fe60B20(1.2)/MgO(1) /Ta(1), x2＝1~4, unit：nm。 Before and after annealing, we study the variation of the magnetic anisotropy and the interlayer exchange coupling between CoFeB layers in the structures. We find that these samples all sh
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