Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: Seeger, Rafael Lopes lattes
Orientador(a): Oliveira, Artur Harres de lattes
Banca de defesa: Viegas, Alexandre Da Cas lattes, Schelp, Luiz Fernando lattes
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:
Ressonância ferromagnética
Exchange bias
Palavras-chave em Inglês:
Ferromagnetic resonance
Área do conhecimento CNPq:
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
Link de acesso: http://repositorio.ufsm.br/handle/1/15846
Resumo: Devices based on effects that generate a dc voltage in ferromagnetic ressonance (FMR) condition are of great interest for broadband communication applications, since they allow the rectification of radio frequency signals by simple ferromagnetic materials. In general, FMR is achivied exposing the sample to a external magnetic field. However, depending on the excitation frequency, the static magnetic field required for the resonance is not low, which hinders technological applications. Exploring spin rectification and inverse spin Hall effects in exchange-biased samples it is possible to rectify radio frequency signals without an external applied magnetic field. Direct voltages of the order of V were obtained when NiFe/FeMn thin films were exposed to microwaves in a shorted microstrip line for a relatively broad frequency range. Connecting the films to a resistive load, the fraction of the incident radio frequency power converted into usable dc power is estimated. This procedure allows the efficiency measurement for applications in wireless power transfer.
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spelling 2019-03-06T20:18:27Z2019-03-06T20:18:27Z2018-07-20http://repositorio.ufsm.br/handle/1/15846Devices based on effects that generate a dc voltage in ferromagnetic ressonance (FMR) condition are of great interest for broadband communication applications, since they allow the rectification of radio frequency signals by simple ferromagnetic materials. In general, FMR is achivied exposing the sample to a external magnetic field. However, depending on the excitation frequency, the static magnetic field required for the resonance is not low, which hinders technological applications. Exploring spin rectification and inverse spin Hall effects in exchange-biased samples it is possible to rectify radio frequency signals without an external applied magnetic field. Direct voltages of the order of V were obtained when NiFe/FeMn thin films were exposed to microwaves in a shorted microstrip line for a relatively broad frequency range. Connecting the films to a resistive load, the fraction of the incident radio frequency power converted into usable dc power is estimated. This procedure allows the efficiency measurement for applications in wireless power transfer.Dispositivos baseados em efeitos capazes de gerar uma tensão elétrica dc na condição de ressonância ferromagnética (FMR) são de grande interesse para aplicações em telecomunicações, já que tais efeitos permitem a retificação de sinais simplesmente utilizando materiais ferromagnéticos. Em geral, para se obter FMR é necessário aplicar um campo magnético estático externo. Porém, dependendo da frequência de excitação, o campo magnético necessário para ressonância não é pequeno, o que tem impossibilitado aplicações tecnológicas. Explorando os efeitos de retificação de spin e o Hall de spin inverso em amostras que apresentam Exchange Bias foi possível retificar sinais de radiofrequência sem a necessidade de aplicar um campo magnético externo. Voltagens dc da ordem de V foram obtidas com filmes finos de NiFe/FeMn quando expostos à radiação de micro-ondas em uma microstrip line para uma banda relativamente larga de frequências. Conectando as amostras à uma carga resistiva, pode-se estimar a fração da radiação incidente que é convertida em um voltagem dc. Este procedimento possibilita a verificação da eficiência do sistema para eventuais aplicações de coleta e transferência de energia sem fio.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/openAccessRessonância ferromagnéticaExchange biasFerromagnetic resonanceCNPQ::CIENCIAS EXATAS E DA TERRA::FISICADetecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMnElectrically detected ferromagnetic resonance in NiFe/FeMn thin filmsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOliveira, Artur Harres dehttp://lattes.cnpq.br/5413344891000141Viegas, Alexandre Da Cashttp://lattes.cnpq.br/5936503285330202Schelp, Luiz Fernandohttp://lattes.cnpq.br/8797015996750551http://lattes.cnpq.br/5993332859357377Seeger, Rafael Lopes100500000006600415298f1-dc82-4dc9-8d55-f7adec366810b053db7c-162e-49f7-8a07-cbe04d31ad977b1812a5-1651-4b73-96b1-6917f5f879c4282472c7-7b75-4441-a214-98925bd11125reponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALDIS_PPGFISICA_2018_SEEGER_RAFAEL.pdfDIS_PPGFISICA_2018_SEEGER_RAFAEL.pdfDissertação de Mestradoapplication/pdf66474284http://repositorio.ufsm.br/bitstream/1/15846/1/DIS_PPGFISICA_2018_SEEGER_RAFAEL.pdf6b58f4ff108b7218097a9a4e712854c6MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
dc.title.alternative.eng.fl_str_mv Electrically detected ferromagnetic resonance in NiFe/FeMn thin films
title Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
spellingShingle Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
Seeger, Rafael Lopes
Ressonância ferromagnética
Exchange bias
Ferromagnetic resonance
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
title_short Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
title_full Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
title_fullStr Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
title_full_unstemmed Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
title_sort Detecção elétrica da ressonância ferromagnética em filmes finos de NiFe/FeMn
author Seeger, Rafael Lopes
author_facet Seeger, Rafael Lopes
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 Viegas, Alexandre Da Cas
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/5936503285330202
dc.contributor.referee2.fl_str_mv Schelp, Luiz Fernando
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/8797015996750551
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/5993332859357377
dc.contributor.author.fl_str_mv Seeger, Rafael Lopes
contributor_str_mv Oliveira, Artur Harres de
Viegas, Alexandre Da Cas
Schelp, Luiz Fernando
dc.subject.por.fl_str_mv Ressonância ferromagnética
Exchange bias
topic Ressonância ferromagnética
Exchange bias
Ferromagnetic resonance
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
dc.subject.eng.fl_str_mv Ferromagnetic resonance
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
description Devices based on effects that generate a dc voltage in ferromagnetic ressonance (FMR) condition are of great interest for broadband communication applications, since they allow the rectification of radio frequency signals by simple ferromagnetic materials. In general, FMR is achivied exposing the sample to a external magnetic field. However, depending on the excitation frequency, the static magnetic field required for the resonance is not low, which hinders technological applications. Exploring spin rectification and inverse spin Hall effects in exchange-biased samples it is possible to rectify radio frequency signals without an external applied magnetic field. Direct voltages of the order of V were obtained when NiFe/FeMn thin films were exposed to microwaves in a shorted microstrip line for a relatively broad frequency range. Connecting the films to a resistive load, the fraction of the incident radio frequency power converted into usable dc power is estimated. This procedure allows the efficiency measurement for applications in wireless power transfer.
publishDate 2018
dc.date.issued.fl_str_mv 2018-07-20
dc.date.accessioned.fl_str_mv 2019-03-06T20:18:27Z
dc.date.available.fl_str_mv 2019-03-06T20:18:27Z
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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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://repositorio.ufsm.br/handle/1/15846
url http://repositorio.ufsm.br/handle/1/15846
dc.language.iso.fl_str_mv por
language por
dc.relation.cnpq.fl_str_mv 100500000006
dc.relation.confidence.fl_str_mv 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 reponame:Manancial - Repositório Digital da UFSM
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reponame_str Manancial - Repositório Digital da UFSM
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