Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/3886 |
Resumo: | This work reports the study of magnetic anisotropy of Fe/Mn bilayers, and Fe/Mn/Fe and Fe/Mn/Co trilayers, grown by molecular beam epitaxy onto monocrystalline MgO(001) substrates. Samples were produced with the Fe layer grown at a temperature of 175 ° C, with a thickness of 5 or 10 nm, the Co layer grown at 50 ° C, with a thickness of 2 or 5 nm, and the Mn layer grown at temperatures of 50 ° C, 150 ° C or 175 ° C, with thicknesses in the range from 0.80 to 2.20 nm. The angular variations of the in-plane absorption field, at Q-band (33.9 Ghz) microwave frequency, reveal the presence of a large four-fold magnetic anisotropy in all studied films. In samples with thicker Mn layers, two uniform resonance modes of bcc-Fe and bcc-Co layers are excited by the microwave field. The angular variations of the in-plane absorption field reveal for both layers the presence of fourth order cubic magnetic anisotropy. Films with the Mn layer thickness exceeding 1.16 nm exhibits, however, only a single absorption mode due to the overlapping of Fe-bcc and Co-bcc uniform resonance modes. Experiments at X-band (9.4 GHz) microwave frequency reveal the excitation of non-aligned and non-resonant modes, suggesting, for samples with the Mn layer grown at low temperature, a non-collinear coupling between the magnetic layers in the presence of low-intensity magnetic fields. Four-fold magnetic anisotropy constants in the range from 3.0 x 105 to 4.8 x 105 erg/cm3 for the Fe layer, and from 2.0 x 105 to 6.4 x 105 erg/cm3, for the Co layer, are given by the experiments. The magnetic parameters deduced from the in-plane measurements at Q-band microwave frequency are used to fit the in-plane and out-of-plane angular variations of resonance fields at X-band frequency. |
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Pelegrini, Fernandohttp://lattes.cnpq.br/0159280600583768Pelegrini, FernandoSilva, Edson Corrêa daSaitovitch, Elisa Maria BaggioFranco Júnior, AdolfoRabelo, José Nicodemos Teixeirahttp://lattes.cnpq.br/2752782453011955Pessoa, Márcio Solino2015-01-16T17:30:10Z2013-06-07PESSOA, Márcio Solino. Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co. 2013. 101 f. Tese (Doutorado em Física) - Universidade Federal de Goiás, Goiânia, 2013.http://repositorio.bc.ufg.br/tede/handle/tede/3886This work reports the study of magnetic anisotropy of Fe/Mn bilayers, and Fe/Mn/Fe and Fe/Mn/Co trilayers, grown by molecular beam epitaxy onto monocrystalline MgO(001) substrates. Samples were produced with the Fe layer grown at a temperature of 175 ° C, with a thickness of 5 or 10 nm, the Co layer grown at 50 ° C, with a thickness of 2 or 5 nm, and the Mn layer grown at temperatures of 50 ° C, 150 ° C or 175 ° C, with thicknesses in the range from 0.80 to 2.20 nm. The angular variations of the in-plane absorption field, at Q-band (33.9 Ghz) microwave frequency, reveal the presence of a large four-fold magnetic anisotropy in all studied films. In samples with thicker Mn layers, two uniform resonance modes of bcc-Fe and bcc-Co layers are excited by the microwave field. The angular variations of the in-plane absorption field reveal for both layers the presence of fourth order cubic magnetic anisotropy. Films with the Mn layer thickness exceeding 1.16 nm exhibits, however, only a single absorption mode due to the overlapping of Fe-bcc and Co-bcc uniform resonance modes. Experiments at X-band (9.4 GHz) microwave frequency reveal the excitation of non-aligned and non-resonant modes, suggesting, for samples with the Mn layer grown at low temperature, a non-collinear coupling between the magnetic layers in the presence of low-intensity magnetic fields. Four-fold magnetic anisotropy constants in the range from 3.0 x 105 to 4.8 x 105 erg/cm3 for the Fe layer, and from 2.0 x 105 to 6.4 x 105 erg/cm3, for the Co layer, are given by the experiments. The magnetic parameters deduced from the in-plane measurements at Q-band microwave frequency are used to fit the in-plane and out-of-plane angular variations of resonance fields at X-band frequency.Este trabalho relata o estudo da anisotropia magnética em bicamadas Fe/Mn, e tricamadas Fe/Mn/Fe e Fe/Mn/Co, crescidas por epitaxia de feixe molecular sobre substratos monocristalinos de MgO (001). As amostras foram produzidas com a camada de Fe crescida à temperatura de 175°C, com espessura de 5 ou 10 nm, a camada de Co crescida à temperatura de 50°C, com espessura de 2 ou 5 nm, e a camada de Mn crescida a temperaturas de 50°C, 150°C ou 175°C, com espessuras na faixa de 0.80 a 2.20 nm. As variações angulares do campo de ressonância no plano dos filmes, em banda-Q (33.9 GHz) de frequência de micro-ondas, revelam a presença de anisotropia magnética cúbica de quarta ordem em todas as amostras estudadas. Para as tricamadas Fe/Mn/Co com menores espessuras da camada de Mn, os modos uniformes de ressonância de Fe e de Co, são excitados pelo campo oscilante de micro-ondas. As variações angulares de campo de ressonância no plano dos filmes revelam a presença de anisotropia magnética de quarta ordem nas duas camadas. Filmes com camada de Mn com espessura superior a 1.16 nm apresentam, entretanto, apenas um modo uniforme de ressonância, atribuído à sobreposição dos modos uniformes de ressonância das camadas de Fe-bcc e de Co-bcc, como resultado de efeitos de interface que reduzem a diferença entre as magnetizações efetivas das duas camadas. Experimentos em banda-X (9.4 GHz) de frequência de micro-ondas revelam a presença de modos não alinhados e não ressonantes, sugerindo, para amostras com camada de Mn crescida em baixa temperatura, um acoplamento não colinear entre as camadas magnéticas na presença de campo magnético de baixa intensidade. Constantes de anisotropia cúbica de 3.0 x 105 a 4.8 x 105 erg/cm3 para a camada de Fe, e de 2.0 x 105 a 6.4 x 105 erg/cm3, para a camada de Co, são deduzidos dos experimentos. Os parâmetros magnéticos deduzidos das variações angulares do campo de ressonância no plano das amostras, em banda-Q de frequência de micro-ondas, são usados para simular em banda-X as variações angulares do campo de ressonância no plano e fora do plano dos filmes.Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-01-16T17:15:31Z No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Tese - Márcio Solino Pessoa - 2013.pdf: 3016321 bytes, checksum: 0475321bc8fda0cf44f37f4a946b3725 (MD5)Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-01-16T17:30:10Z (GMT) No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Tese - Márcio Solino Pessoa - 2013.pdf: 3016321 bytes, checksum: 0475321bc8fda0cf44f37f4a946b3725 (MD5)Made available in DSpace on 2015-01-16T17:30:10Z (GMT). No. of bitstreams: 2 license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Tese - Márcio Solino Pessoa - 2013.pdf: 3016321 bytes, checksum: 0475321bc8fda0cf44f37f4a946b3725 (MD5) Previous issue date: 2013-06-07Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESapplication/pdfhttp://repositorio.bc.ufg.br/tede/retrieve/14738/Tese%20-%20M%c3%a1rcio%20Solino%20Pessoa%20-%202013.pdf.jpgporUniversidade Federal de GoiásPrograma de Pós-graduação em Fisica (IF)UFGBrasilInstituto de Física - IF (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessAnisotropia magnéticaRessonância ferromagnéticaMagnetic anisotropyFerromagnetic resonanceCIENCIAS EXATAS E DA TERRA::FISICAAnisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/CoMagnetic anisiotropy in epitaxial filmsFe/Mn, Fe/Mn/Fe e Fe/Mn/Coinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis3162138865744262028600600600600-4029658853652049306-83271462965037459292075167498588264571reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGORIGINALTese - Márcio Solino Pessoa - 2013.pdfTese - Márcio Solino Pessoa - 2013.pdfapplication/pdf3016321http://repositorio.bc.ufg.br/tede/bitstreams/9748d023-ff9a-4a7c-ac66-42c49100ddce/download0475321bc8fda0cf44f37f4a946b3725MD52LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
dc.title.alternative.por.fl_str_mv |
Magnetic anisiotropy in epitaxial filmsFe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
title |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
spellingShingle |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co Pessoa, Márcio Solino Anisotropia magnética Ressonância ferromagnética Magnetic anisotropy Ferromagnetic resonance CIENCIAS EXATAS E DA TERRA::FISICA |
title_short |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
title_full |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
title_fullStr |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
title_full_unstemmed |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
title_sort |
Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co |
author |
Pessoa, Márcio Solino |
author_facet |
Pessoa, Márcio Solino |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Pelegrini, Fernando |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0159280600583768 |
dc.contributor.referee1.fl_str_mv |
Pelegrini, Fernando |
dc.contributor.referee2.fl_str_mv |
Silva, Edson Corrêa da |
dc.contributor.referee3.fl_str_mv |
Saitovitch, Elisa Maria Baggio |
dc.contributor.referee4.fl_str_mv |
Franco Júnior, Adolfo |
dc.contributor.referee5.fl_str_mv |
Rabelo, José Nicodemos Teixeira |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2752782453011955 |
dc.contributor.author.fl_str_mv |
Pessoa, Márcio Solino |
contributor_str_mv |
Pelegrini, Fernando Pelegrini, Fernando Silva, Edson Corrêa da Saitovitch, Elisa Maria Baggio Franco Júnior, Adolfo Rabelo, José Nicodemos Teixeira |
dc.subject.por.fl_str_mv |
Anisotropia magnética Ressonância ferromagnética |
topic |
Anisotropia magnética Ressonância ferromagnética Magnetic anisotropy Ferromagnetic resonance CIENCIAS EXATAS E DA TERRA::FISICA |
dc.subject.eng.fl_str_mv |
Magnetic anisotropy Ferromagnetic resonance |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA |
description |
This work reports the study of magnetic anisotropy of Fe/Mn bilayers, and Fe/Mn/Fe and Fe/Mn/Co trilayers, grown by molecular beam epitaxy onto monocrystalline MgO(001) substrates. Samples were produced with the Fe layer grown at a temperature of 175 ° C, with a thickness of 5 or 10 nm, the Co layer grown at 50 ° C, with a thickness of 2 or 5 nm, and the Mn layer grown at temperatures of 50 ° C, 150 ° C or 175 ° C, with thicknesses in the range from 0.80 to 2.20 nm. The angular variations of the in-plane absorption field, at Q-band (33.9 Ghz) microwave frequency, reveal the presence of a large four-fold magnetic anisotropy in all studied films. In samples with thicker Mn layers, two uniform resonance modes of bcc-Fe and bcc-Co layers are excited by the microwave field. The angular variations of the in-plane absorption field reveal for both layers the presence of fourth order cubic magnetic anisotropy. Films with the Mn layer thickness exceeding 1.16 nm exhibits, however, only a single absorption mode due to the overlapping of Fe-bcc and Co-bcc uniform resonance modes. Experiments at X-band (9.4 GHz) microwave frequency reveal the excitation of non-aligned and non-resonant modes, suggesting, for samples with the Mn layer grown at low temperature, a non-collinear coupling between the magnetic layers in the presence of low-intensity magnetic fields. Four-fold magnetic anisotropy constants in the range from 3.0 x 105 to 4.8 x 105 erg/cm3 for the Fe layer, and from 2.0 x 105 to 6.4 x 105 erg/cm3, for the Co layer, are given by the experiments. The magnetic parameters deduced from the in-plane measurements at Q-band microwave frequency are used to fit the in-plane and out-of-plane angular variations of resonance fields at X-band frequency. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-06-07 |
dc.date.accessioned.fl_str_mv |
2015-01-16T17:30:10Z |
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 |
PESSOA, Márcio Solino. Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co. 2013. 101 f. Tese (Doutorado em Física) - Universidade Federal de Goiás, Goiânia, 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/3886 |
identifier_str_mv |
PESSOA, Márcio Solino. Anisotropia magnética em filmes epitaxiais Fe/Mn, Fe/Mn/Fe e Fe/Mn/Co. 2013. 101 f. Tese (Doutorado em Física) - Universidade Federal de Goiás, Goiânia, 2013. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/3886 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
3162138865744262028 |
dc.relation.confidence.fl_str_mv |
600 600 600 600 |
dc.relation.department.fl_str_mv |
-4029658853652049306 |
dc.relation.cnpq.fl_str_mv |
-8327146296503745929 |
dc.relation.sponsorship.fl_str_mv |
2075167498588264571 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
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 Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Fisica (IF) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Física - IF (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Repositório Institucional da UFG |
collection |
Repositório Institucional da UFG |
bitstream.url.fl_str_mv |
http://repositorio.bc.ufg.br/tede/bitstreams/9748d023-ff9a-4a7c-ac66-42c49100ddce/download http://repositorio.bc.ufg.br/tede/bitstreams/18ed6ea6-cd9a-49ad-82ac-caf81e4a7e04/download http://repositorio.bc.ufg.br/tede/bitstreams/e475193a-1a2e-4592-b62b-7b7f290cad71/download http://repositorio.bc.ufg.br/tede/bitstreams/864b9033-d50c-492c-89af-057b4b845238/download http://repositorio.bc.ufg.br/tede/bitstreams/a7f7e9aa-c506-4e1e-83bf-51c7ad8d1d28/download http://repositorio.bc.ufg.br/tede/bitstreams/b0dff169-9276-4a57-9fac-3a79bdec9504/download http://repositorio.bc.ufg.br/tede/bitstreams/630f1e62-2419-4353-9f62-697e33fdeafd/download |
bitstream.checksum.fl_str_mv |
0475321bc8fda0cf44f37f4a946b3725 bd3efa91386c1718a7f26a329fdcb468 4afdbb8c545fd630ea7db775da747b2f 29b9d5e95be03707f9d4a2e110421c11 9da0b6dfac957114c6a7714714b86306 1ab9bda63189d01dde3c3ffaf33bb960 cc73c4c239a4c332d642ba1e7c7a9fb2 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tasesdissertacoes.bc@ufg.br |
_version_ |
1798044362253271040 |