Dinâmica de paredes de domínios sob o efeito de correntes elétricas
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional Manancial UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/3922 |
Resumo: | In this work, we have measured the domain wall velocity in the low field regime and studied the domain wall dynamics in Joule-annealed amorphous glass-covered microwires with positive magnetostriction. Such microwires are known to present magnetic bi-stability when axially magnetized. In order to measure of the single domain wall dynamics under different conditions, an electrical current was applied to the wire simultaneously to the mechanical stress and driving magnetic field. We have observed that the applied stress decreases the domain wall mobility. When the dc current is applied to the sample, an increase or a decrease is observed on the axial domain wall mobility, depending on the current direction. When we have treated the orthogonal motion of the domain wall, the current influence is not detected. On the other hand, it was verified a modification on the domain wall length. It was also observed a change in the domain wall shape from conical to parabolic one. These results are explained in terms of the change in the magnetic energy promoted by the additional Oersted field which, by its time, modifies the length and shape of the conical domain wall, in such a way that the orthogonal domain wall velocity is not changed by the applied current. |
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2017-05-052017-05-052013-11-28BECK, Fábio. Effect of electric current on domain wall dynamics. 2013. 103 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2013.http://repositorio.ufsm.br/handle/1/3922In this work, we have measured the domain wall velocity in the low field regime and studied the domain wall dynamics in Joule-annealed amorphous glass-covered microwires with positive magnetostriction. Such microwires are known to present magnetic bi-stability when axially magnetized. In order to measure of the single domain wall dynamics under different conditions, an electrical current was applied to the wire simultaneously to the mechanical stress and driving magnetic field. We have observed that the applied stress decreases the domain wall mobility. When the dc current is applied to the sample, an increase or a decrease is observed on the axial domain wall mobility, depending on the current direction. When we have treated the orthogonal motion of the domain wall, the current influence is not detected. On the other hand, it was verified a modification on the domain wall length. It was also observed a change in the domain wall shape from conical to parabolic one. These results are explained in terms of the change in the magnetic energy promoted by the additional Oersted field which, by its time, modifies the length and shape of the conical domain wall, in such a way that the orthogonal domain wall velocity is not changed by the applied current.Nesse trabalho, foi medida a velocidade de paredes de domínios em regime de baixos campos e estudada a dinâmica dessas paredes em microfios amorfos recobertos por vidros com magnetostricção positiva tratados via efeito Joule. Tais microfios são conhecidos por apresentar biestabilidade magnética quando axialmente magnetizados. A fim avaliar a dinâmica de uma única parede de domínio sob diferentes condições, corrente elétrica DC foi aplicada simultaneamente a tensões mecânicas e campo magnético externo. Foi verificado que quando uma tensão mecânica externa é aplicada, a mobilidade da parede de domínio diminui. Já quando a corrente foi aplicada na amostra, um aumento ou decréscimo da mobilidade axial da parede foi observado, dependendo do sentido da corrente aplicada. Quando foi tratado da velocidade ortogonal da parede de domínio, não foi observada influência da corrente. Por outro lado, foi verificado uma modificação no comprimento da parede de domínios. Além disto, foi observado uma mudança na forma da parede de domínio, passando de um formato cônico para parabólico. Os resultados são explicados em termos da mudança na energia magnética promovida pelo campo de Oersted, gerado pela corrente aplicada, que por sua vez modifica o comprimento e a forma da parede de domínio sem que a velocidade ortogonal da parede de domínio seja alterada pela corrente aplicada.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em FísicaUFSMBRFísicaMicrofios magnéticosDinâmica de paredes de domínioAnisotropias magnéticasMagnetics microwiresDomain wall dynamicsMagnetics anisotropyCNPQ::CIENCIAS EXATAS E DA TERRA::FISICADinâmica de paredes de domínios sob o efeito de correntes elétricasEffect of electric current on domain wall dynamicsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisCarara, Marcos Andréhttp://lattes.cnpq.br/1334485128053939Schmidt, Joao Edgarhttp://lattes.cnpq.br/8076130432431642Bohn, Felipehttp://lattes.cnpq.br/9522788035526763Schelp, Luiz Fernandohttp://lattes.cnpq.br/8797015996750551Calegari, Eleonir Joãohttp://lattes.cnpq.br/6030572534512173http://lattes.cnpq.br/9552631840562444Beck, Fábio100500000006400300500300300300300a8bf0e5b-f6aa-4bdc-8cf7-3957f5757509fe595e5c-236c-4be8-b680-7d6a638db0e7896ccdcf-d8ca-48da-b151-f8cdeb9032014d8978ac-8e68-4706-948f-cf9b127bffe983cae2eb-925f-4728-82fd-ec1b13ce25b6dffd1794-93d3-4090-a812-3dbcb1f5a343info:eu-repo/semantics/openAccessreponame:Repositório Institucional Manancial UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALBECK, FABIO.pdfapplication/pdf5257323http://repositorio.ufsm.br/bitstream/1/3922/1/BECK%2c%20FABIO.pdf419b23502b3d1b73a77ef143f7842084MD51TEXTBECK, FABIO.pdf.txtBECK, FABIO.pdf.txtExtracted texttext/plain197899http://repositorio.ufsm.br/bitstream/1/3922/2/BECK%2c%20FABIO.pdf.txt0a3f6c7bfa191b678ab76f58b66edfe9MD52THUMBNAILBECK, FABIO.pdf.jpgBECK, FABIO.pdf.jpgIM Thumbnailimage/jpeg5534http://repositorio.ufsm.br/bitstream/1/3922/3/BECK%2c%20FABIO.pdf.jpg4bbb98265684f49b03cde8063cb4ca5bMD531/39222023-05-11 14:32:00.709oai:repositorio.ufsm.br:1/3922Repositório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestouvidoria@ufsm.bropendoar:39132023-05-11T17:32Repositório Institucional Manancial UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
dc.title.alternative.eng.fl_str_mv |
Effect of electric current on domain wall dynamics |
title |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
spellingShingle |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas Beck, Fábio Microfios magnéticos Dinâmica de paredes de domínio Anisotropias magnéticas Magnetics microwires Domain wall dynamics Magnetics anisotropy CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
title_full |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
title_fullStr |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
title_full_unstemmed |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
title_sort |
Dinâmica de paredes de domínios sob o efeito de correntes elétricas |
author |
Beck, Fábio |
author_facet |
Beck, Fábio |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Carara, Marcos André |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1334485128053939 |
dc.contributor.referee1.fl_str_mv |
Schmidt, Joao Edgar |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/8076130432431642 |
dc.contributor.referee2.fl_str_mv |
Bohn, Felipe |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/9522788035526763 |
dc.contributor.referee3.fl_str_mv |
Schelp, Luiz Fernando |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/8797015996750551 |
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/9552631840562444 |
dc.contributor.author.fl_str_mv |
Beck, Fábio |
contributor_str_mv |
Carara, Marcos André Schmidt, Joao Edgar Bohn, Felipe Schelp, Luiz Fernando Calegari, Eleonir João |
dc.subject.por.fl_str_mv |
Microfios magnéticos Dinâmica de paredes de domínio Anisotropias magnéticas |
topic |
Microfios magnéticos Dinâmica de paredes de domínio Anisotropias magnéticas Magnetics microwires Domain wall dynamics Magnetics anisotropy CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Magnetics microwires Domain wall dynamics Magnetics anisotropy |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
In this work, we have measured the domain wall velocity in the low field regime and studied the domain wall dynamics in Joule-annealed amorphous glass-covered microwires with positive magnetostriction. Such microwires are known to present magnetic bi-stability when axially magnetized. In order to measure of the single domain wall dynamics under different conditions, an electrical current was applied to the wire simultaneously to the mechanical stress and driving magnetic field. We have observed that the applied stress decreases the domain wall mobility. When the dc current is applied to the sample, an increase or a decrease is observed on the axial domain wall mobility, depending on the current direction. When we have treated the orthogonal motion of the domain wall, the current influence is not detected. On the other hand, it was verified a modification on the domain wall length. It was also observed a change in the domain wall shape from conical to parabolic one. These results are explained in terms of the change in the magnetic energy promoted by the additional Oersted field which, by its time, modifies the length and shape of the conical domain wall, in such a way that the orthogonal domain wall velocity is not changed by the applied current. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-11-28 |
dc.date.accessioned.fl_str_mv |
2017-05-05 |
dc.date.available.fl_str_mv |
2017-05-05 |
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.citation.fl_str_mv |
BECK, Fábio. Effect of electric current on domain wall dynamics. 2013. 103 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/3922 |
identifier_str_mv |
BECK, Fábio. Effect of electric current on domain wall dynamics. 2013. 103 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
url |
http://repositorio.ufsm.br/handle/1/3922 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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100500000006 |
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400 300 500 300 300 300 300 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
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 |
BR |
dc.publisher.department.fl_str_mv |
Física |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
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