Exchange bias perpendicular em multicamadas de IrMn/Co/Pd
Ano de defesa: | 2023 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
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: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/29238 |
Resumo: | Magnetic skyrmions are spin textures that can arise in thin films that exhibit the Dzyaloshinskii–Moriya interaction. Such interaction emerges from symmetry breaking at the interface between a ferromagnetic material and a heavy metal. Typically, skyrmions must be subjected to an external magnetic field to be stabilized, which compromises their potential for technological applications. In this work, we aimed to use the exchange bias phenomenon to replace the role of the external field in the formation of such spin textures. Thin films composed of IrMn and Co/Pd multilayers were deposited using magnetron sputtering on glass substrates. A variable-thickness Pd spacer was inserted between IrMn and the first Co layer, with the aim of gradually reducing the interaction between the antiferromagnetic and ferromagnetic layers. To induce the exchange bias phenomenon perpendicular to the film plane, the samples were subjected to heat treatments and cooled in the presence of an external magnetic field. The samples were magnetically characterized before and after treatment using AGFM and VSM techniques. Some of the as-fabricated samples exhibited perpendicular magnetic anisotropy, and after treatment, all samples showed this anisotropy. We observed a variation in the bias field and coercive field intensity with the temperature of the heat treatment and the thickness of the spacer. Magnetic force microscopy was used to observe the magnetic domain structures present in the films under three different conditions: as-fabricated samples, after magnetically saturating out-of-plane, and after an AC demagnetization protocol. Despite the presence of perpendicular anisotropy and exchange bias in most of the films, only labyrinth and bubble-type structures were observed. It was not possible to confirm the presence of skyrmions or the influence of EB on their formation. |
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2023-05-29T15:34:02Z2023-05-29T15:34:02Z2023-04-26http://repositorio.ufsm.br/handle/1/29238Magnetic skyrmions are spin textures that can arise in thin films that exhibit the Dzyaloshinskii–Moriya interaction. Such interaction emerges from symmetry breaking at the interface between a ferromagnetic material and a heavy metal. Typically, skyrmions must be subjected to an external magnetic field to be stabilized, which compromises their potential for technological applications. In this work, we aimed to use the exchange bias phenomenon to replace the role of the external field in the formation of such spin textures. Thin films composed of IrMn and Co/Pd multilayers were deposited using magnetron sputtering on glass substrates. A variable-thickness Pd spacer was inserted between IrMn and the first Co layer, with the aim of gradually reducing the interaction between the antiferromagnetic and ferromagnetic layers. To induce the exchange bias phenomenon perpendicular to the film plane, the samples were subjected to heat treatments and cooled in the presence of an external magnetic field. The samples were magnetically characterized before and after treatment using AGFM and VSM techniques. Some of the as-fabricated samples exhibited perpendicular magnetic anisotropy, and after treatment, all samples showed this anisotropy. We observed a variation in the bias field and coercive field intensity with the temperature of the heat treatment and the thickness of the spacer. Magnetic force microscopy was used to observe the magnetic domain structures present in the films under three different conditions: as-fabricated samples, after magnetically saturating out-of-plane, and after an AC demagnetization protocol. Despite the presence of perpendicular anisotropy and exchange bias in most of the films, only labyrinth and bubble-type structures were observed. It was not possible to confirm the presence of skyrmions or the influence of EB on their formation.Skyrmions magnéticos são texturas de spins que podem surgir em filmes finos que apresentam a interação de Dzyaloshinskii–Moriya. Tal interação emerge da quebra de simetria na interface entre um material ferromagnético e um metal pesado. Tipicamente, os skyrmions necessitam de um campo magnético externo para serem estabilizados, o que compromete o seu potencial para aplicações tecnológicas. No presente trabalho, tínhamos como objetivo utilizar o fenômeno de exchange bias para substituir o papel do campo externo na formação de tais texturas de spin. Filmes finos compostos por IrMn e multicamadas de Co/Pd foram depositadas via magnetron sputtering sobre substratos de vidro. Entre o IrMn e a primeira camada de Co foi inserido um espaçador de Pd com espessura variável, com o intuito de diminuir gradualmente a interação entre as camadas antiferromagnética e ferromagnética. Afim de induzir o fenômeno de exchange bias em uma direção perpendicular ao plano dos filmes, as amostras foram submetidas a tratamentos térmicos e resfriados na presença de um campo externo. As amostras foram caracterizadas magneticamente como feitas e após tratadas utilizando as técnicas de AGFM e VSM. Algumas amostras como feitas apresentaram anisotropia magnética perpendicular, e após tratadas todas apresentaram esta anisotropia. Observamos uma variação na intensidade do campo de bias e campo coercivo com a temperatura de tratamento térmico utilizado e a espessura do espaçador. Microscopia de força magnética foi utilizada para observar as estruturas de domínios magnéticos presentes nos filmes em três diferentes situações: amostras como feitas, após saturadas magneticamente fora do plano e após a realização de um protocolo de desmagnetização AC. Apesar da existência de anisotropia perpendicular e exchange bias em grande parte dos filmes, somente foi possível observar estruturas do tipo labirinto e bolhas. Não sendo possível confirmar a presença de skyrmions e a influência do EB na formação destes.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/openAccessSkyrmions magneticosExchange bias perpendicularAMPFilmes finosMagnetic skyrmionsPerpendicular exchange biasPMAThin filmsCNPQ::CIENCIAS EXATAS E DA TERRA::FISICAExchange bias perpendicular em multicamadas de IrMn/Co/PdPerpendicular exchange bias in IrMn/Co/Pd multilayersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOliveira, Artur Harres dehttp://lattes.cnpq.br/5413344891000141Gomes, Matheus GaminoViegas, Alexandre da Cashttp://lattes.cnpq.br/4064426626269342Figueiró, Bruno Monteiro100500000006600600600600600415298f1-dc82-4dc9-8d55-f7adec36681028ee22f1-a385-4963-a790-08555a0b283bba4ed109-f8a1-416d-838a-27987cc53aafddcbbe6a-39da-488d-bfd2-af3fc2a9c937reponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMCC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8805http://repositorio.ufsm.br/bitstream/1/29238/2/license_rdf4460e5956bc1d1639be9ae6146a50347MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81956http://repositorio.ufsm.br/bitstream/1/29238/3/license.txt2f0571ecee68693bd5cd3f17c1e075dfMD53ORIGINALDIS_PPGFÍSICA_2023_FIGUEIRÓ_BRUNO.pdfDIS_PPGFÍSICA_2023_FIGUEIRÓ_BRUNO.pdfDissertação de mestradoapplication/pdf18480282http://repositorio.ufsm.br/bitstream/1/29238/1/DIS_PPGF%c3%8dSICA_2023_FIGUEIR%c3%93_BRUNO.pdf35a8cb0b212c1e39f948f1bea0b94dd2MD511/292382023-05-29 12:34:02.414oai:repositorio.ufsm.br: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ório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestopendoar:39132023-05-29T15:34:02Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
dc.title.alternative.eng.fl_str_mv |
Perpendicular exchange bias in IrMn/Co/Pd multilayers |
title |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
spellingShingle |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd Figueiró, Bruno Monteiro Skyrmions magneticos Exchange bias perpendicular AMP Filmes finos Magnetic skyrmions Perpendicular exchange bias PMA Thin films CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
title_full |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
title_fullStr |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
title_full_unstemmed |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
title_sort |
Exchange bias perpendicular em multicamadas de IrMn/Co/Pd |
author |
Figueiró, Bruno Monteiro |
author_facet |
Figueiró, Bruno Monteiro |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Oliveira, Artur Harres de |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5413344891000141 |
dc.contributor.referee1.fl_str_mv |
Gomes, Matheus Gamino |
dc.contributor.referee2.fl_str_mv |
Viegas, Alexandre da Cas |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4064426626269342 |
dc.contributor.author.fl_str_mv |
Figueiró, Bruno Monteiro |
contributor_str_mv |
Oliveira, Artur Harres de Gomes, Matheus Gamino Viegas, Alexandre da Cas |
dc.subject.por.fl_str_mv |
Skyrmions magneticos Exchange bias perpendicular AMP Filmes finos |
topic |
Skyrmions magneticos Exchange bias perpendicular AMP Filmes finos Magnetic skyrmions Perpendicular exchange bias PMA Thin films CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Magnetic skyrmions Perpendicular exchange bias PMA Thin films |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
Magnetic skyrmions are spin textures that can arise in thin films that exhibit the Dzyaloshinskii–Moriya interaction. Such interaction emerges from symmetry breaking at the interface between a ferromagnetic material and a heavy metal. Typically, skyrmions must be subjected to an external magnetic field to be stabilized, which compromises their potential for technological applications. In this work, we aimed to use the exchange bias phenomenon to replace the role of the external field in the formation of such spin textures. Thin films composed of IrMn and Co/Pd multilayers were deposited using magnetron sputtering on glass substrates. A variable-thickness Pd spacer was inserted between IrMn and the first Co layer, with the aim of gradually reducing the interaction between the antiferromagnetic and ferromagnetic layers. To induce the exchange bias phenomenon perpendicular to the film plane, the samples were subjected to heat treatments and cooled in the presence of an external magnetic field. The samples were magnetically characterized before and after treatment using AGFM and VSM techniques. Some of the as-fabricated samples exhibited perpendicular magnetic anisotropy, and after treatment, all samples showed this anisotropy. We observed a variation in the bias field and coercive field intensity with the temperature of the heat treatment and the thickness of the spacer. Magnetic force microscopy was used to observe the magnetic domain structures present in the films under three different conditions: as-fabricated samples, after magnetically saturating out-of-plane, and after an AC demagnetization protocol. Despite the presence of perpendicular anisotropy and exchange bias in most of the films, only labyrinth and bubble-type structures were observed. It was not possible to confirm the presence of skyrmions or the influence of EB on their formation. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-05-29T15:34:02Z |
dc.date.available.fl_str_mv |
2023-05-29T15:34:02Z |
dc.date.issued.fl_str_mv |
2023-04-26 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/29238 |
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http://repositorio.ufsm.br/handle/1/29238 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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100500000006 |
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600 600 600 600 600 |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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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 |
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Brasil |
dc.publisher.department.fl_str_mv |
Física |
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Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
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