Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/13374 |
Resumo: | In the present thesis, the generation of a dc voltage in exchange-biased Ta/NiFe/FeMn/Ta multilayers at ferromagnetic resonance was investigated. This dc signal is related to two distinct phenomena, namely, the spin rectification effect (SRE) and the inverse spin Hall effect (ISHE). The first comes from a non-linear coupling between a dynamic electric current and a dynamic electrical resistance induced by a microwave magnetic field via anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE). The sencond refers to the transformation of a pure spin current into a charge current caused by spin dependent scattering processes. Two methods were used to discriminate between SRE and ISHE contributions. The universal method explores the dependence of those effects with the spin injection direction. The angular method envolves an angular sweeping, where the in-plane static magnetic field direction is varied, and for each angle H, VDC(H) is measured. Among all produced samples, that with the highest exchange bias field was chosen to conduct the investigation and separate the contribution of the ISHE signal from SRE by both methods. The ISHE contribution was confirmed by equivalence between the universal and angular methods for separation of the ISHE signal. |
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Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/TaInverse spin hall effect Ta/NiFe/FeMn/Ta multilayersExchange biasNiFe/FeMnInverse spin Hall effect - ISHENiFe/FeMnEfeito Hall de spin inverso - ISHECNPQ::CIENCIAS EXATAS E DA TERRA::FISICAIn the present thesis, the generation of a dc voltage in exchange-biased Ta/NiFe/FeMn/Ta multilayers at ferromagnetic resonance was investigated. This dc signal is related to two distinct phenomena, namely, the spin rectification effect (SRE) and the inverse spin Hall effect (ISHE). The first comes from a non-linear coupling between a dynamic electric current and a dynamic electrical resistance induced by a microwave magnetic field via anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE). The sencond refers to the transformation of a pure spin current into a charge current caused by spin dependent scattering processes. Two methods were used to discriminate between SRE and ISHE contributions. The universal method explores the dependence of those effects with the spin injection direction. The angular method envolves an angular sweeping, where the in-plane static magnetic field direction is varied, and for each angle H, VDC(H) is measured. Among all produced samples, that with the highest exchange bias field was chosen to conduct the investigation and separate the contribution of the ISHE signal from SRE by both methods. The ISHE contribution was confirmed by equivalence between the universal and angular methods for separation of the ISHE signal.Na presente tese, investigou-se a geração de tensão elétrica dc em multicamadas de Ta/NiFe/FeMn/Ta com exchange bias (EB) na condição de ressonância ferromagnética (FMR). Este sinal está relacionado a dois fenômenos distintos, o efeito de retificação de spins (SRE) e o efeito Hall de spin inverso (ISHE). O primeiro origina-se do acoplamento não-linear entre a corrente elétrica dinâmica e a resistência elétrica dinâmica induzida pelo campo magnético de micro-ondas via magnetorresistência anisotrópica (AMR) e efeito Hall anômalo (AHE). O segundo refere-se à transformação da corrente pura de spins em corrente de carga causada por processos de espalhamentos dependentes de spin. Dois métodos foram utilizados para discriminar as contribuições do SRE e do ISHE. O método universal explora a dependência desses efeitos com a direção da injeção de spin. O método angular envolve uma varredura angular, onde a direção do campo magnético estático no plano é variada e, para cada ângulo H é medida uma tensão VDC(H). Dentre todas as amostras produzidas escolheu-se a com maior campo de exchange bias para realizar a investigação e separar a contribuição do sinal ISHE do SRE pelos dois métodos. A contribuição ISHE foi confirmada mediante equivalência entre os métodos universal e angular para separação do sinal ISHE.Universidade Federal de Santa MariaBrasilFísicaUFSMPrograma de Pós-Graduação em FísicaCentro de Ciências Naturais e ExatasDorneles, Lucio Strazzaboscohttp://lattes.cnpq.br/7244173039310066Oliveira, Artur Harres dehttp://lattes.cnpq.br/5413344891000141Geshev, Julian Penkovhttp://lattes.cnpq.br/0126829192805579Cunha, Rafael Otoniel Ribeiro Rodrigues dahttp://lattes.cnpq.br/9504048916371979Denardin, Juliano Casagrandehttp://lattes.cnpq.br/5425237044575885Calegari, Eleonir Joãohttp://lattes.cnpq.br/6030572534512173Garcia, Wagner Jesus da Silva2018-06-12T20:16:52Z2018-06-12T20:16:52Z2017-10-27info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/13374porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-06-29T13:51:26Zoai:repositorio.ufsm.br:1/13374Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-06-29T13:51:26Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta Inverse spin hall effect Ta/NiFe/FeMn/Ta multilayers |
title |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
spellingShingle |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta Garcia, Wagner Jesus da Silva Exchange bias NiFe/FeMn Inverse spin Hall effect - ISHE NiFe/FeMn Efeito Hall de spin inverso - ISHE CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
title_full |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
title_fullStr |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
title_full_unstemmed |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
title_sort |
Efeito hall de spin inverso em multicamadas de Ta/NiFe/FeMn/Ta |
author |
Garcia, Wagner Jesus da Silva |
author_facet |
Garcia, Wagner Jesus da Silva |
author_role |
author |
dc.contributor.none.fl_str_mv |
Dorneles, Lucio Strazzabosco http://lattes.cnpq.br/7244173039310066 Oliveira, Artur Harres de http://lattes.cnpq.br/5413344891000141 Geshev, Julian Penkov http://lattes.cnpq.br/0126829192805579 Cunha, Rafael Otoniel Ribeiro Rodrigues da http://lattes.cnpq.br/9504048916371979 Denardin, Juliano Casagrande http://lattes.cnpq.br/5425237044575885 Calegari, Eleonir João http://lattes.cnpq.br/6030572534512173 |
dc.contributor.author.fl_str_mv |
Garcia, Wagner Jesus da Silva |
dc.subject.por.fl_str_mv |
Exchange bias NiFe/FeMn Inverse spin Hall effect - ISHE NiFe/FeMn Efeito Hall de spin inverso - ISHE CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
topic |
Exchange bias NiFe/FeMn Inverse spin Hall effect - ISHE NiFe/FeMn Efeito Hall de spin inverso - ISHE CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
In the present thesis, the generation of a dc voltage in exchange-biased Ta/NiFe/FeMn/Ta multilayers at ferromagnetic resonance was investigated. This dc signal is related to two distinct phenomena, namely, the spin rectification effect (SRE) and the inverse spin Hall effect (ISHE). The first comes from a non-linear coupling between a dynamic electric current and a dynamic electrical resistance induced by a microwave magnetic field via anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE). The sencond refers to the transformation of a pure spin current into a charge current caused by spin dependent scattering processes. Two methods were used to discriminate between SRE and ISHE contributions. The universal method explores the dependence of those effects with the spin injection direction. The angular method envolves an angular sweeping, where the in-plane static magnetic field direction is varied, and for each angle H, VDC(H) is measured. Among all produced samples, that with the highest exchange bias field was chosen to conduct the investigation and separate the contribution of the ISHE signal from SRE by both methods. The ISHE contribution was confirmed by equivalence between the universal and angular methods for separation of the ISHE signal. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-10-27 2018-06-12T20:16:52Z 2018-06-12T20:16:52Z |
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/1/13374 |
url |
http://repositorio.ufsm.br/handle/1/13374 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Física UFSM Programa de Pós-Graduação em Física Centro de Ciências Naturais e Exatas |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Física UFSM Programa de Pós-Graduação em Física Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
_version_ |
1805922165427535872 |