Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/3923 |
Resumo: | In this work, the magnetoimpedance (MI) and magnetization dynamics in multilayered Ni81Fe19/Ag and Ni81Fe19/Cu samples are studied. The samples were produced by magnetron sputtering at the Laboratório de Magnetistmo e Materiais Magnéticos da UFSM with Py=Ni81Fe19 thickness of 100Å and 200Å, while the Ag layers were grown with 7Å, 14Å, 25Å, 50Å, 100Å and 200Å in the case of Py/Ag samples. For the Py/Cu samples, the Py layer was kept constant at 100Å, while the Cu layer was kept with 25Å. The 15, 30, 50, 70 and 100 number of bilayers was kept in all set of samples. The magnetoimpedance measurements were performed in the frequency range 100kHz 1.8GHz. MI ratios of 240% were observed in the [Py(100Å)/Ag(25Å)]x100 system, while 253% was obtained in the [Py(100Å)/Cu(25Å)]x100 system at 1.8GHz and 709MHz, respectively. In the case of the Py/Ag samples, a multiple peak structure (4 to 6 peaks) was observed whenever the Py/Ag thickness ratio was 4. These multiple peak structures are possibly associated to multiple ferromagnetic resonance frequencies in these particular samples. The experimental relations of dispersion were obtained for all samples that presented FMR in the studied frequency range. The results are discussed in terms of the induced magnetic anisotropies associated to the sputtering guns and also taking into account the more important interactions between the magnetic layers. |
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Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/CuMagnetoimpedance and dynamics of the magnetization in multilayers of Ni81Fe19/Ag and Ni81Fe19/CuFísicaPhysicsCNPQ::CIENCIAS EXATAS E DA TERRA::FISICAIn this work, the magnetoimpedance (MI) and magnetization dynamics in multilayered Ni81Fe19/Ag and Ni81Fe19/Cu samples are studied. The samples were produced by magnetron sputtering at the Laboratório de Magnetistmo e Materiais Magnéticos da UFSM with Py=Ni81Fe19 thickness of 100Å and 200Å, while the Ag layers were grown with 7Å, 14Å, 25Å, 50Å, 100Å and 200Å in the case of Py/Ag samples. For the Py/Cu samples, the Py layer was kept constant at 100Å, while the Cu layer was kept with 25Å. The 15, 30, 50, 70 and 100 number of bilayers was kept in all set of samples. The magnetoimpedance measurements were performed in the frequency range 100kHz 1.8GHz. MI ratios of 240% were observed in the [Py(100Å)/Ag(25Å)]x100 system, while 253% was obtained in the [Py(100Å)/Cu(25Å)]x100 system at 1.8GHz and 709MHz, respectively. In the case of the Py/Ag samples, a multiple peak structure (4 to 6 peaks) was observed whenever the Py/Ag thickness ratio was 4. These multiple peak structures are possibly associated to multiple ferromagnetic resonance frequencies in these particular samples. The experimental relations of dispersion were obtained for all samples that presented FMR in the studied frequency range. The results are discussed in terms of the induced magnetic anisotropies associated to the sputtering guns and also taking into account the more important interactions between the magnetic layers.Nesse trabalho foram estudados o efeito magnetoimpedância (MI) e a dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu. As amostras foram produzidas usando a técnica de magnetron sputtering no Laboratório de Magnetismo e Materiais Magnéticos da UFSM com as espessuras de 100 e 200Å para as camadas de Py=Ni81Fe19 e com as espessuras de 7, 14, 25, 50, 100 e 200Å para as camadas de Ag, no caso das amostras de Py/Ag. Para as amostras de Py/Cu, a espessura da camada de Py foi mantida constante em 100Å, enquanto as camadas de Cu foram mantidas com 25Å de espessura. O número de bicamadas foi de 15, 30, 50, 70 e 100 em quase todo o conjunto de amostras. As medidas de MI foram feitas na faixa de freqüências de 100kHz 1.8GHz. Foram observadas razões de magnetoimpedância com valores de 240% no caso do sistema [Py(100Å)/Ag(25Å)]x100 e de 253% no sistema [Py(100Å)/Cu(25Å)]x100 nas freqüências de 1.8GHz e 709MHz, respectivamente. No caso das amostras de Py/Ag, foi observada uma estrutura de picos múltiplos sempre que a razão entre as espessuras de Py e de Ag assumia o valor 4. As estruturas de picos quádruplos e sêxtuplos possivelmente estão associadas a múltiplas ressonâncias ferromagnéticas nessas amostras. Foram obtidas as relações de dispersão experimentais para as amostras que apresentaram ressonância ferromagnética na faixa de freqüências estudada. Os resultados são discutidos em termos das anisotropias induzidas nas amostras pelos canhões de sputtering e em termos das interações mais relevantes entre as camadas magnéticas.Universidade Federal de Santa MariaBRFísicaUFSMPrograma de Pós-Graduação em FísicaSommer, Rubem Luishttp://lattes.cnpq.br/7705036710106784Lima, Luiz Carlos Sampaiohttp://lattes.cnpq.br/7591029585871788Schmidt, Joao Edgarhttp://lattes.cnpq.br/8076130432431642Silva, Celso Arami Marques dahttp://lattes.cnpq.br/1456416227497509Magalhães, Sergio Garciahttp://lattes.cnpq.br/8564675492283232Andrade, Antonio Marcos Helgueira de2006-08-172006-08-172006-05-29info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfANDRADE, Antonio Marcos Helgueira de. Magnetoimpedance and dynamics of the magnetization in multilayers of Ni81Fe19/Ag and Ni81Fe19/Cu. 2006. 224 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2006.http://repositorio.ufsm.br/handle/1/3923porinfo:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-12-28T11:38:46Zoai:repositorio.ufsm.br:1/3923Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-12-28T11:38:46Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu Magnetoimpedance and dynamics of the magnetization in multilayers of Ni81Fe19/Ag and Ni81Fe19/Cu |
title |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
spellingShingle |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu Andrade, Antonio Marcos Helgueira de Física Physics CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
title_full |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
title_fullStr |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
title_full_unstemmed |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
title_sort |
Magnetoimpedância e dinâmica da magnetização em multicamadas de Ni81Fe19/Ag e Ni81Fe19/Cu |
author |
Andrade, Antonio Marcos Helgueira de |
author_facet |
Andrade, Antonio Marcos Helgueira de |
author_role |
author |
dc.contributor.none.fl_str_mv |
Sommer, Rubem Luis http://lattes.cnpq.br/7705036710106784 Lima, Luiz Carlos Sampaio http://lattes.cnpq.br/7591029585871788 Schmidt, Joao Edgar http://lattes.cnpq.br/8076130432431642 Silva, Celso Arami Marques da http://lattes.cnpq.br/1456416227497509 Magalhães, Sergio Garcia http://lattes.cnpq.br/8564675492283232 |
dc.contributor.author.fl_str_mv |
Andrade, Antonio Marcos Helgueira de |
dc.subject.por.fl_str_mv |
Física Physics CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
topic |
Física Physics CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA |
description |
In this work, the magnetoimpedance (MI) and magnetization dynamics in multilayered Ni81Fe19/Ag and Ni81Fe19/Cu samples are studied. The samples were produced by magnetron sputtering at the Laboratório de Magnetistmo e Materiais Magnéticos da UFSM with Py=Ni81Fe19 thickness of 100Å and 200Å, while the Ag layers were grown with 7Å, 14Å, 25Å, 50Å, 100Å and 200Å in the case of Py/Ag samples. For the Py/Cu samples, the Py layer was kept constant at 100Å, while the Cu layer was kept with 25Å. The 15, 30, 50, 70 and 100 number of bilayers was kept in all set of samples. The magnetoimpedance measurements were performed in the frequency range 100kHz 1.8GHz. MI ratios of 240% were observed in the [Py(100Å)/Ag(25Å)]x100 system, while 253% was obtained in the [Py(100Å)/Cu(25Å)]x100 system at 1.8GHz and 709MHz, respectively. In the case of the Py/Ag samples, a multiple peak structure (4 to 6 peaks) was observed whenever the Py/Ag thickness ratio was 4. These multiple peak structures are possibly associated to multiple ferromagnetic resonance frequencies in these particular samples. The experimental relations of dispersion were obtained for all samples that presented FMR in the studied frequency range. The results are discussed in terms of the induced magnetic anisotropies associated to the sputtering guns and also taking into account the more important interactions between the magnetic layers. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-08-17 2006-08-17 2006-05-29 |
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 |
ANDRADE, Antonio Marcos Helgueira de. Magnetoimpedance and dynamics of the magnetization in multilayers of Ni81Fe19/Ag and Ni81Fe19/Cu. 2006. 224 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/3923 |
identifier_str_mv |
ANDRADE, Antonio Marcos Helgueira de. Magnetoimpedance and dynamics of the magnetization in multilayers of Ni81Fe19/Ag and Ni81Fe19/Cu. 2006. 224 f. Tese (Doutorado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2006. |
url |
http://repositorio.ufsm.br/handle/1/3923 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Física UFSM Programa de Pós-Graduação em Física |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria BR Física UFSM Programa de Pós-Graduação em Física |
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 |
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1805922124711329792 |