Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: Rosa, Diego Saldanha da lattes
Orientador(a): Dorneles, Lucio Strazzabosco lattes
Banca de defesa: Gündel, André lattes, Andrade, Antonio Marcos Helgueira de lattes, Daudt, Natália de Freitas lattes, Calegari, Eleonir João lattes
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
Programa de Pós-Graduação: Programa de Pós-Graduação em Física
Departamento: Física
País: Brasil
Palavras-chave em Português:
Anisotropia magnética perpendicular
Pseudoválvula de spin
Óxido de alumínio anodizado
Cobalto
Paládio
Palavras-chave em Inglês:
Perpendicular magnetic anisotropy
Pseudospin valve
Anodic aluminum oxide
Cobalt
Palladium
Área do conhecimento CNPq:
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
Link de acesso: http://repositorio.ufsm.br/handle/1/15184
Resumo: Co/Pd multilayers and [Co/Pd] / Co / (Pd or Cu)/ [Co/Pd] pseudo spin-valves (PSV) with different configurations have been grown by dc magnetron sputtering technique onto glass substrate and different nanostructured anodic aluminum oxide (AAO) substrates (dots or antidots). Structural characterization has been made by x-ray diffraction and x-ray reflectometry, and image characterization has been performed using atomic force microscopy and scanning electron microscopy. Magnetic behavior has been measured using an alternating gradient field magnetometer and the surface magnetization has been imaged by magnetic force microscopy. Extraordinary Hall effect and magnetoresistance transport measurement played an important role in this work. The behavior of the magnetic reversion in the multilayers is dependent of the cobalt thickness, and for thicknesses smaller than 4Å the magnetization remains perpendicular to the surface of the sample. The inversion in the PSV magnetization is characterized by two phases, a consequence of the decoupling between the multilayers that is strongly dependent on the thickness of the spacer and the number of repetitions of the Co/Pd. The coercivity of films grown onto AAO membranes is greater than that of continuous films because of the greater number of imperfections that act as pinning points for the magnetic domains. An evolution in magnetoresistance values was obtained as a function of the thickness of the spacer and number of Co/Pd bilayers. Anomalous peaks in the Hall effect measurements in PSVs show the possibility of applications in non-volatile magnetic storage systems.
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spelling 2019-01-02T14:06:52Z2019-01-02T14:06:52Z2018-03-28http://repositorio.ufsm.br/handle/1/15184Co/Pd multilayers and [Co/Pd] / Co / (Pd or Cu)/ [Co/Pd] pseudo spin-valves (PSV) with different configurations have been grown by dc magnetron sputtering technique onto glass substrate and different nanostructured anodic aluminum oxide (AAO) substrates (dots or antidots). Structural characterization has been made by x-ray diffraction and x-ray reflectometry, and image characterization has been performed using atomic force microscopy and scanning electron microscopy. Magnetic behavior has been measured using an alternating gradient field magnetometer and the surface magnetization has been imaged by magnetic force microscopy. Extraordinary Hall effect and magnetoresistance transport measurement played an important role in this work. The behavior of the magnetic reversion in the multilayers is dependent of the cobalt thickness, and for thicknesses smaller than 4Å the magnetization remains perpendicular to the surface of the sample. The inversion in the PSV magnetization is characterized by two phases, a consequence of the decoupling between the multilayers that is strongly dependent on the thickness of the spacer and the number of repetitions of the Co/Pd. The coercivity of films grown onto AAO membranes is greater than that of continuous films because of the greater number of imperfections that act as pinning points for the magnetic domains. An evolution in magnetoresistance values was obtained as a function of the thickness of the spacer and number of Co/Pd bilayers. Anomalous peaks in the Hall effect measurements in PSVs show the possibility of applications in non-volatile magnetic storage systems.Multicamadas de Co/Pd e pseudoválvulas de spin (PSV) de [Co/Pd] / Co / (Pd ou Cu) / [Co/Pd] com diferentes configurações foram crescidas, utilizando a técnica de magnetron sputtering dc, sobre substratos de vidro e diferentes substratos de óxido de alumínio anodizado nanoestruturados (AAO), tanto sobre poros quanto sobre domos. Caracterizações estruturais foram feitas por meio de difração de raios x e reflectometria de raios x, e caracterização por imagens foram realizadas utilizando microscópio de força atômica e microscópio eletrônico de varredura. O comportamento magnético foi medido utilizando um magnetômetro de gradiente de campo alternado e imagens magnéticas da superfície foram observadas utilizando um microscópio de força magnética. Medidas de transporte de efeito Hall extraordinário e de magnetorresistência tiveram um importante papel nas investigações deste trabalho. O comportamento da reversão magnética nas multicamadas é dependente da espessura do cobalto, sendo que para espessuras menores do que 4Å a magnetização se mantém perpendicular a superfície da amostra. A inversão na magnetização das PSV é caracterizada por duas fases, como consequência do desacoplamento entre as multicamadas que é fortemente dependente da espessura do espaçador e do número de repetições das bicamadas de Co/Pd. A coercividade dos filmes crescidos sobre membranas de AAO é maior do que a dos filmes contínuos devido ao maior número de imperfeições que funcionam como pontos de fixação para os domínios magnéticos. Uma evolução nos valores de magnetorresistência foi obtido em função da espessura do espaçador e número de bicamadas Co/Pd. Picos anômalos nas medidas de efeito Hall nas PSVs mostram a possibilidade de aplicações em sistemas de armazenamento magnético não volátil.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESporUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em FísicaUFSMBrasilFísicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessAnisotropia magnética perpendicularPseudoválvula de spinÓxido de alumínio anodizadoCobaltoPaládioPerpendicular magnetic anisotropyPseudospin valveAnodic aluminum oxideCobaltPalladiumCNPQ::CIENCIAS EXATAS E DA TERRA::FISICAMulticamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturadosMultilayers and pseudo spin valves with perpendicular anisotropy on nanostructured substratesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisDorneles, Lucio Strazzaboscohttp://lattes.cnpq.br/7244173039310066Denardin, Juliano Casagrandehttp://lattes.cnpq.br/5425237044575885Gündel, Andréhttp://lattes.cnpq.br/9063998902105812Andrade, Antonio Marcos Helgueira dehttp://lattes.cnpq.br/5005867811414170Daudt, Natália de Freitashttp://lattes.cnpq.br/3938857351102458Calegari, Eleonir Joãohttp://lattes.cnpq.br/6030572534512173http://lattes.cnpq.br/2154789200595625Rosa, Diego Saldanha da100500000006600500e5de4f50-b352-48fb-a699-ffab7b7d8f1da851c95c-25db-4f15-aa53-0c975993928d319f46b0-313b-4ee9-a2e9-6c3defe3036cc60cb78d-9274-4c5d-9822-bdae4ba561fdc3fb6592-11dd-487a-81c0-f482b7fd9b85cc3fa52f-cd1b-4fe4-a2f7-4ee37a3541707a7de2b6-f62b-449a-8d32-3cc578160abfreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGFISICA_2018_ROSA_DIEGO.pdfTES_PPGFISICA_2018_ROSA_DIEGO.pdfTese de Doutoradoapplication/pdf20172110http://repositorio.ufsm.br/bitstream/1/15184/1/TES_PPGFISICA_2018_ROSA_DIEGO.pdfdacf23fba05bbc8c6bc5c588d0a115f1MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
dc.title.alternative.eng.fl_str_mv Multilayers and pseudo spin valves with perpendicular anisotropy on nanostructured substrates
title Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
spellingShingle Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
Rosa, Diego Saldanha da
Anisotropia magnética perpendicular
Pseudoválvula de spin
Óxido de alumínio anodizado
Cobalto
Paládio
Perpendicular magnetic anisotropy
Pseudospin valve
Anodic aluminum oxide
Cobalt
Palladium
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
title_short Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
title_full Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
title_fullStr Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
title_full_unstemmed Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
title_sort Multicamadas magnéticas e pseudoválvulas de spin com anisotropia perpendicular sobre substratos nanoestruturados
author Rosa, Diego Saldanha da
author_facet Rosa, Diego Saldanha da
author_role author
dc.contributor.advisor1.fl_str_mv Dorneles, Lucio Strazzabosco
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/7244173039310066
dc.contributor.advisor-co1.fl_str_mv Denardin, Juliano Casagrande
dc.contributor.advisor-co1Lattes.fl_str_mv http://lattes.cnpq.br/5425237044575885
dc.contributor.referee1.fl_str_mv Gündel, André
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/9063998902105812
dc.contributor.referee2.fl_str_mv Andrade, Antonio Marcos Helgueira de
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/5005867811414170
dc.contributor.referee3.fl_str_mv Daudt, Natália de Freitas
dc.contributor.referee3Lattes.fl_str_mv http://lattes.cnpq.br/3938857351102458
dc.contributor.referee4.fl_str_mv Calegari, Eleonir João
dc.contributor.referee4Lattes.fl_str_mv http://lattes.cnpq.br/6030572534512173
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/2154789200595625
dc.contributor.author.fl_str_mv Rosa, Diego Saldanha da
contributor_str_mv Dorneles, Lucio Strazzabosco
Denardin, Juliano Casagrande
Gündel, André
Andrade, Antonio Marcos Helgueira de
Daudt, Natália de Freitas
Calegari, Eleonir João
dc.subject.por.fl_str_mv Anisotropia magnética perpendicular
Pseudoválvula de spin
Óxido de alumínio anodizado
Cobalto
Paládio
topic Anisotropia magnética perpendicular
Pseudoválvula de spin
Óxido de alumínio anodizado
Cobalto
Paládio
Perpendicular magnetic anisotropy
Pseudospin valve
Anodic aluminum oxide
Cobalt
Palladium
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
dc.subject.eng.fl_str_mv Perpendicular magnetic anisotropy
Pseudospin valve
Anodic aluminum oxide
Cobalt
Palladium
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
description Co/Pd multilayers and [Co/Pd] / Co / (Pd or Cu)/ [Co/Pd] pseudo spin-valves (PSV) with different configurations have been grown by dc magnetron sputtering technique onto glass substrate and different nanostructured anodic aluminum oxide (AAO) substrates (dots or antidots). Structural characterization has been made by x-ray diffraction and x-ray reflectometry, and image characterization has been performed using atomic force microscopy and scanning electron microscopy. Magnetic behavior has been measured using an alternating gradient field magnetometer and the surface magnetization has been imaged by magnetic force microscopy. Extraordinary Hall effect and magnetoresistance transport measurement played an important role in this work. The behavior of the magnetic reversion in the multilayers is dependent of the cobalt thickness, and for thicknesses smaller than 4Å the magnetization remains perpendicular to the surface of the sample. The inversion in the PSV magnetization is characterized by two phases, a consequence of the decoupling between the multilayers that is strongly dependent on the thickness of the spacer and the number of repetitions of the Co/Pd. The coercivity of films grown onto AAO membranes is greater than that of continuous films because of the greater number of imperfections that act as pinning points for the magnetic domains. An evolution in magnetoresistance values was obtained as a function of the thickness of the spacer and number of Co/Pd bilayers. Anomalous peaks in the Hall effect measurements in PSVs show the possibility of applications in non-volatile magnetic storage systems.
publishDate 2018
dc.date.issued.fl_str_mv 2018-03-28
dc.date.accessioned.fl_str_mv 2019-01-02T14:06:52Z
dc.date.available.fl_str_mv 2019-01-02T14:06:52Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://repositorio.ufsm.br/handle/1/15184
url http://repositorio.ufsm.br/handle/1/15184
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http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
dc.publisher.program.fl_str_mv Programa de Pós-Graduação em Física
dc.publisher.initials.fl_str_mv UFSM
dc.publisher.country.fl_str_mv Brasil
dc.publisher.department.fl_str_mv Física
publisher.none.fl_str_mv Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas
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