Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/23325 |
Resumo: | Magnetic skyrmions are non-trivial spin textures that resist external disturbances and are promising candidates for next generation magnetic recording devices. However, a major challenge in the realization of devices based on skyrmions is the stabilization of ordered ar-rangements of these spin textures under ambient temperature and zero applied field condi-tions. Among the materials that have skyrmions, the multilayer of ferromagnetic materials (Co) interspersed with heavy metals (Pt and Ta), with strong spin-orbit coupling, have inte-resting properties, as they favor the Dzyaloshinskii-Moriya (DMI) interaction, which is a anti-symmetric exchange interaction that tilts the spins of neighboring layers and helps to stabili-ze skyrmions. The objective of this thesis is to observe and study the stabilization of skyr-mions in Pt/Co/Ta films and also deposited on nanomodulated substrates. The formation and stabilization of magnetic skyrmions in self-organized hexagonal nanodome arrays is de-monstrated for the first time. The Pt/Co/Ta multilayers were fabricated by sputtering, with different Co thicknes-ses, and thus it was possible to modulate the perpendicular anisotropy. A FORC diagram technique, obtained from Hall Effect measurements, was used to determine the magnetic fields that should be applied to nucleate skyrmions, and thus stabilize skyrmions at zero fi-eld. Magnetic force microscopy images of the continuous films and nanodomes with 100 and 200 nm showed stable skyrmions in the zero field, and in the case of nanodomes, these are organized according to the topography of the nanostructures. Micromagnetic simulations of films and nanodomes were compared with experiments to determine the correlation of the domain textures with the topography of the samples. |
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2021-12-15T16:39:39Z2021-12-15T16:39:39Z2020-03-27http://repositorio.ufsm.br/handle/1/23325Magnetic skyrmions are non-trivial spin textures that resist external disturbances and are promising candidates for next generation magnetic recording devices. However, a major challenge in the realization of devices based on skyrmions is the stabilization of ordered ar-rangements of these spin textures under ambient temperature and zero applied field condi-tions. Among the materials that have skyrmions, the multilayer of ferromagnetic materials (Co) interspersed with heavy metals (Pt and Ta), with strong spin-orbit coupling, have inte-resting properties, as they favor the Dzyaloshinskii-Moriya (DMI) interaction, which is a anti-symmetric exchange interaction that tilts the spins of neighboring layers and helps to stabili-ze skyrmions. The objective of this thesis is to observe and study the stabilization of skyr-mions in Pt/Co/Ta films and also deposited on nanomodulated substrates. The formation and stabilization of magnetic skyrmions in self-organized hexagonal nanodome arrays is de-monstrated for the first time. The Pt/Co/Ta multilayers were fabricated by sputtering, with different Co thicknes-ses, and thus it was possible to modulate the perpendicular anisotropy. A FORC diagram technique, obtained from Hall Effect measurements, was used to determine the magnetic fields that should be applied to nucleate skyrmions, and thus stabilize skyrmions at zero fi-eld. Magnetic force microscopy images of the continuous films and nanodomes with 100 and 200 nm showed stable skyrmions in the zero field, and in the case of nanodomes, these are organized according to the topography of the nanostructures. Micromagnetic simulations of films and nanodomes were compared with experiments to determine the correlation of the domain textures with the topography of the samples.Os skyrmions magnéticos são texturas de spin não triviais que resistem a perturba-ções externas, sendo candidatos promissores a portadores de informação em dispositivos de gravação magnética. No entanto, um grande desafio na realização de dispositivos baseados em skyrmions é a estabilização de arranjos ordenadas dessas texturas de spin em condições de temperatura ambiente e a campo aplicado zero. Entre os materiais que apresentam skyrmions, as multicamadas de materiais ferromagnéticos (Co) intercaladas com metais pe-sados (Pt e Ta), com forte acoplamento spin-órbita, apresentam propriedades interessantes, pois favorecem a interação Dzyaloshinskii-Moriya (DMI), que é uma interação de troca an-tissimétrica que inclina os spins das camadas vizinhas e ajuda a estabilizar skyrmions. O obje-tivo desta tese é observar e estudar a estabilização de skyrmions em multicamadas de Pt/Co/Ta e também depositados sobre substratos nanomodulados. Se demonstra pela pri-meira vez a formação e estabilização de skyrmions magnéticos em matrizes de nanodomos hexagonais auto-organizados. As multicamadas de Pt/Co/Ta foram fabricadas por magnetron sputtering, com dife-rentes espessuras de Co, e assim foi possível modular a anisotropia perpendicular. Foi utili-zada uma técnica de diagramas FORC, obtidas das medidas de efeito Hall, para determinar os campos magnéticos que devem ser aplicados para nuclear skyrmions, e assim estabilizar skyrmions a campo zero. Imagens de microscopia de força magnética dos filmes contínuos e dos nanodomos com 100 e 200 nm mostraram skyrmions estáveis no campo zero, e no caso dos nanodomos estes são organizados seguindo a topografia das nanoestruturas. Simulações micromagnéticas dos filmes e dos nanodomos foram comparadas com experimentos para determinar a correlação das texturas do domínio com a topografia das amostras.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/openAccessDiagrama FORC HallMulticamada magnéticaSkyrmionNanoestrutura magnéticaEfeito hallSimulação micromagnéticaFORC Hall diagramMagnetic multilayerMagnetic nanostructureHall effectMicromagnetic simulationCNPQ::CIENCIAS EXATAS E DA TERRA::FISICAEstabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomosStabilization of magnetic Skyrmions in multilayers of Pt/Co/Ta deposited in nanodomosinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisDenardin, Juliano Casagrandehttp://lattes.cnpq.br/5425237044575885Dorneles, Lucio Strazzaboscohttp://lattes.cnpq.br/7244173039310066Viegas, Alexandre Da CasOliveira, Artur Harres deGomes, Matheus GaminoSilva, Ricardo Barreto dahttp://lattes.cnpq.br/8329230563128516Silva, Denilson Toneto da100500000006600600600600600600600600d3ceadd5-6045-44fd-956f-a00caadff88f85605b35-7ea7-410e-b777-b08c23be07cf489e9450-f664-43be-856d-9e897dcf888c7b1812a5-1651-4b73-96b1-6917f5f879c45904cc52-7f5b-474c-bb47-dc46abc9be6c6ea7729d-a3a9-4872-841c-687132afe881cc7f3b3b-7f48-4807-ab68-5d0c49f84be1reponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGFÍSICA_2020_SILVA_DENILSON.pdfTES_PPGFÍSICA_2020_SILVA_DENILSON.pdfTese de doutoradoapplication/pdf8059815http://repositorio.ufsm.br/bitstream/1/23325/1/TES_PPGF%c3%8dSICA_2020_SILVA_DENILSON.pdf4fcae7201b5c7336a560f09752dbe983MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
dc.title.alternative.eng.fl_str_mv |
Stabilization of magnetic Skyrmions in multilayers of Pt/Co/Ta deposited in nanodomos |
title |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
spellingShingle |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos Silva, Denilson Toneto da Diagrama FORC Hall Multicamada magnética Skyrmion Nanoestrutura magnética Efeito hall Simulação micromagnética FORC Hall diagram Magnetic multilayer Magnetic nanostructure Hall effect Micromagnetic simulation CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
title_full |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
title_fullStr |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
title_full_unstemmed |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
title_sort |
Estabilização de Skyrmions magnéticos em multicamadas de Pt/Co/Ta depositadas em nanodomos |
author |
Silva, Denilson Toneto da |
author_facet |
Silva, Denilson Toneto da |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Denardin, Juliano Casagrande |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5425237044575885 |
dc.contributor.advisor-co1.fl_str_mv |
Dorneles, Lucio Strazzabosco |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/7244173039310066 |
dc.contributor.referee1.fl_str_mv |
Viegas, Alexandre Da Cas |
dc.contributor.referee2.fl_str_mv |
Oliveira, Artur Harres de |
dc.contributor.referee3.fl_str_mv |
Gomes, Matheus Gamino |
dc.contributor.referee4.fl_str_mv |
Silva, Ricardo Barreto da |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/8329230563128516 |
dc.contributor.author.fl_str_mv |
Silva, Denilson Toneto da |
contributor_str_mv |
Denardin, Juliano Casagrande Dorneles, Lucio Strazzabosco Viegas, Alexandre Da Cas Oliveira, Artur Harres de Gomes, Matheus Gamino Silva, Ricardo Barreto da |
dc.subject.por.fl_str_mv |
Diagrama FORC Hall Multicamada magnética Skyrmion Nanoestrutura magnética Efeito hall Simulação micromagnética |
topic |
Diagrama FORC Hall Multicamada magnética Skyrmion Nanoestrutura magnética Efeito hall Simulação micromagnética FORC Hall diagram Magnetic multilayer Magnetic nanostructure Hall effect Micromagnetic simulation CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
FORC Hall diagram Magnetic multilayer Magnetic nanostructure Hall effect Micromagnetic simulation |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
Magnetic skyrmions are non-trivial spin textures that resist external disturbances and are promising candidates for next generation magnetic recording devices. However, a major challenge in the realization of devices based on skyrmions is the stabilization of ordered ar-rangements of these spin textures under ambient temperature and zero applied field condi-tions. Among the materials that have skyrmions, the multilayer of ferromagnetic materials (Co) interspersed with heavy metals (Pt and Ta), with strong spin-orbit coupling, have inte-resting properties, as they favor the Dzyaloshinskii-Moriya (DMI) interaction, which is a anti-symmetric exchange interaction that tilts the spins of neighboring layers and helps to stabili-ze skyrmions. The objective of this thesis is to observe and study the stabilization of skyr-mions in Pt/Co/Ta films and also deposited on nanomodulated substrates. The formation and stabilization of magnetic skyrmions in self-organized hexagonal nanodome arrays is de-monstrated for the first time. The Pt/Co/Ta multilayers were fabricated by sputtering, with different Co thicknes-ses, and thus it was possible to modulate the perpendicular anisotropy. A FORC diagram technique, obtained from Hall Effect measurements, was used to determine the magnetic fields that should be applied to nucleate skyrmions, and thus stabilize skyrmions at zero fi-eld. Magnetic force microscopy images of the continuous films and nanodomes with 100 and 200 nm showed stable skyrmions in the zero field, and in the case of nanodomes, these are organized according to the topography of the nanostructures. Micromagnetic simulations of films and nanodomes were compared with experiments to determine the correlation of the domain textures with the topography of the samples. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020-03-27 |
dc.date.accessioned.fl_str_mv |
2021-12-15T16:39:39Z |
dc.date.available.fl_str_mv |
2021-12-15T16:39:39Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/23325 |
url |
http://repositorio.ufsm.br/handle/1/23325 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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100500000006 |
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600 600 600 600 600 600 600 600 |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International 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 |
dc.source.none.fl_str_mv |
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