Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/11155 |
Resumo: | In this work we describe the synthesis and characterization of the structural, eletronic and magnetic properties of La1.5Sr0.5CoMn0.5Fe0.5O6 compound. Our main focus was on the investigation of 50% of Mn to Fe substitution in La1.5Sr0.5CoMnO6, with a particular interest in the spontaneous exchange bias effect, a phenomena characterized by the shift in the magnetic hysteresis curves taken after the system bein cooled in zero magnetic field. The polycrystalline sample here investigated was syntesized by conventional solid state reaction technique and investigated by means of X-ray powder diffraction, magnetization as a function of temperature [M(T)] and magnetization as a function of magnetic field [M(H)]. The La1.5Sr0.5CoMn0.5Fe0.5O6 crystal forms in rhombohedral symmetry, space group, in agreement with results observed for similar compounds. The M(T) measurements have revealed a ferromagnetic-like transition at TC ≈ 150 K, and also indicated the presence of competing magnetic phases, which leads to the formation of ferromagnetics clusters embedded in a paramagnetic matrix at high temperature. This is a hallmark of the Griffiths Phase, here occurring in the 150 K < T < 205 K range. The M(H) curves carried after cooling the system in zero field have showed that La1.5Sr0.5CoMn0.5Fe0.5O6 exhibits the spontaneous Exchange Bias effect at low temperatures, while for the measurements carried after cooling the system in the presence of a external magnetic field it is observed a significant enhancement of the shift in the M(H) curve. |
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Bufaiçal, Leandro Felix de Sousahttp://lattes.cnpq.br/1392206843733548Bufaiçal, Leandro Felix de SousaBittar, Eduardo MatzenbacherSantana, Ricardo Costa dehttp://lattes.cnpq.br/6681166213798248Silva, Arthur Garcia2021-03-17T11:44:48Z2021-03-17T11:44:48Z2021-02-26SILVA, A. G. Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6. 2021. 90 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2021.http://repositorio.bc.ufg.br/tede/handle/tede/11155ark:/38995/001300000dsj2In this work we describe the synthesis and characterization of the structural, eletronic and magnetic properties of La1.5Sr0.5CoMn0.5Fe0.5O6 compound. Our main focus was on the investigation of 50% of Mn to Fe substitution in La1.5Sr0.5CoMnO6, with a particular interest in the spontaneous exchange bias effect, a phenomena characterized by the shift in the magnetic hysteresis curves taken after the system bein cooled in zero magnetic field. The polycrystalline sample here investigated was syntesized by conventional solid state reaction technique and investigated by means of X-ray powder diffraction, magnetization as a function of temperature [M(T)] and magnetization as a function of magnetic field [M(H)]. The La1.5Sr0.5CoMn0.5Fe0.5O6 crystal forms in rhombohedral symmetry, space group, in agreement with results observed for similar compounds. The M(T) measurements have revealed a ferromagnetic-like transition at TC ≈ 150 K, and also indicated the presence of competing magnetic phases, which leads to the formation of ferromagnetics clusters embedded in a paramagnetic matrix at high temperature. This is a hallmark of the Griffiths Phase, here occurring in the 150 K < T < 205 K range. The M(H) curves carried after cooling the system in zero field have showed that La1.5Sr0.5CoMn0.5Fe0.5O6 exhibits the spontaneous Exchange Bias effect at low temperatures, while for the measurements carried after cooling the system in the presence of a external magnetic field it is observed a significant enhancement of the shift in the M(H) curve.Nesta dissertação descrevemos a síntese e a caracterização das propriedades estruturais, eletrônicas e magnéticas do composto La1,5Sr0,5CoMn0,5Fe0,5O6. O principal objetivo deste trabalho foi investigar os efeitos da substituição de 50% dos íons de Mn por Fe no composto La1,5Sr0,5CoMnO6, com particular interesse no efeito Exchange Bias Espontâneo, que é caracterizado por uma assimetria na curva de histerese magnética realizada após o material ser resfriado a campo nulo. A amostra policristalina investigada neste trabalho foi sintetizada pela reação de estado sólido convencional e estudada por meio de técnicas de caracterização como difração de raios X de pó, medidas de magnetização em função da temperatura [M(T)] e de magnetização em função do campo magnético aplicado [M(H)]. O composto La1,5Sr0,5CoMn0,5Fe0,5O6 cristaliza-se com simetria romboédrica, no grupo espacial c, em acordo com a simetria reportada para compostos similares. As medidas M(T) indicaram que o composto apresenta uma transição de fase do tipo ferromagnética com temperatura crítica TC ≈ 150 K. Tais medidas também indicaram que o sistema tem características de sistemas magnéticos desordenados que apresentam a presença da competição de fases magnéticas, o que em altas temperaturas leva a nucleação de regiões ferromagnéticas em matriz paramagnética. Tal comportamento é típico da fase de Griffiths, que neste sistema ocorre no intervalo de temperatura 150 K < T < 205 K. As medidas M(H) realizadas após resfriar o sistema a campo zero mostraram que o composto La1,5Sr0,5CoMn0,5Fe0,5O6 apresenta o efeito Exchange Bias Espontâneo em baixas temperaturas, e que um significativo aumento no deslocamento da curva de histerese magnética é observado após o material ser resfriado sob a ação de um campo magnético externo.Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2021-03-16T21:43:05Z No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Arthur Garcia Silva - 2021.pdf: 1894302 bytes, checksum: 94a118bd40e46c2e5f82916a2068ff25 (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2021-03-17T11:44:48Z (GMT) No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Arthur Garcia Silva - 2021.pdf: 1894302 bytes, checksum: 94a118bd40e46c2e5f82916a2068ff25 (MD5)Made available in DSpace on 2021-03-17T11:44:48Z (GMT). No. of bitstreams: 2 license_rdf: 805 bytes, checksum: 4460e5956bc1d1639be9ae6146a50347 (MD5) Dissertação - Arthur Garcia Silva - 2021.pdf: 1894302 bytes, checksum: 94a118bd40e46c2e5f82916a2068ff25 (MD5) Previous issue date: 2021-02-26OutroporUniversidade Federal de GoiásPrograma de Pós-graduação em Fisica (IF)UFGBrasilInstituto de Física - IF (RG)Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessPerovskitaExchange bias espontâneoFase de griffithsPerovskiteSpontaneous exchange biasGriffiths phaseCIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERALCaracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis54500500500500255835reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://repositorio.bc.ufg.br/tede/bitstreams/3819324f-7069-4a0e-b067-d3659429f17e/download8a4605be74aa9ea9d79846c1fba20a33MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8805http://repositorio.bc.ufg.br/tede/bitstreams/4fa48dee-9f53-49c6-8043-47bda06a5576/download4460e5956bc1d1639be9ae6146a50347MD52ORIGINALDissertação - Arthur Garcia Silva - 2021.pdfDissertação - Arthur Garcia Silva - 2021.pdfapplication/pdf1906162http://repositorio.bc.ufg.br/tede/bitstreams/c0ee7f56-a89a-45e0-a5e8-2f547d8414d5/downloada714b4f6edc2eb269e2c737ca03d4eddMD53tede/111552021-04-19 13:08:55.112http://creativecommons.org/licenses/by-nc-nd/4.0/Attribution-NonCommercial-NoDerivatives 4.0 Internationalopen.accessoai:repositorio.bc.ufg.br:tede/11155http://repositorio.bc.ufg.br/tedeRepositório InstitucionalPUBhttp://repositorio.bc.ufg.br/oai/requesttasesdissertacoes.bc@ufg.bropendoar:2021-04-19T16:08:55Repositório Institucional da UFG - Universidade Federal de Goiás (UFG)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 |
dc.title.pt_BR.fl_str_mv |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
title |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
spellingShingle |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 Silva, Arthur Garcia Perovskita Exchange bias espontâneo Fase de griffiths Perovskite Spontaneous exchange bias Griffiths phase CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL |
title_short |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
title_full |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
title_fullStr |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
title_full_unstemmed |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
title_sort |
Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6 |
author |
Silva, Arthur Garcia |
author_facet |
Silva, Arthur Garcia |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Bufaiçal, Leandro Felix de Sousa |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1392206843733548 |
dc.contributor.referee1.fl_str_mv |
Bufaiçal, Leandro Felix de Sousa |
dc.contributor.referee2.fl_str_mv |
Bittar, Eduardo Matzenbacher |
dc.contributor.referee3.fl_str_mv |
Santana, Ricardo Costa de |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/6681166213798248 |
dc.contributor.author.fl_str_mv |
Silva, Arthur Garcia |
contributor_str_mv |
Bufaiçal, Leandro Felix de Sousa Bufaiçal, Leandro Felix de Sousa Bittar, Eduardo Matzenbacher Santana, Ricardo Costa de |
dc.subject.por.fl_str_mv |
Perovskita Exchange bias espontâneo Fase de griffiths |
topic |
Perovskita Exchange bias espontâneo Fase de griffiths Perovskite Spontaneous exchange bias Griffiths phase CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL |
dc.subject.eng.fl_str_mv |
Perovskite Spontaneous exchange bias Griffiths phase |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERAL |
description |
In this work we describe the synthesis and characterization of the structural, eletronic and magnetic properties of La1.5Sr0.5CoMn0.5Fe0.5O6 compound. Our main focus was on the investigation of 50% of Mn to Fe substitution in La1.5Sr0.5CoMnO6, with a particular interest in the spontaneous exchange bias effect, a phenomena characterized by the shift in the magnetic hysteresis curves taken after the system bein cooled in zero magnetic field. The polycrystalline sample here investigated was syntesized by conventional solid state reaction technique and investigated by means of X-ray powder diffraction, magnetization as a function of temperature [M(T)] and magnetization as a function of magnetic field [M(H)]. The La1.5Sr0.5CoMn0.5Fe0.5O6 crystal forms in rhombohedral symmetry, space group, in agreement with results observed for similar compounds. The M(T) measurements have revealed a ferromagnetic-like transition at TC ≈ 150 K, and also indicated the presence of competing magnetic phases, which leads to the formation of ferromagnetics clusters embedded in a paramagnetic matrix at high temperature. This is a hallmark of the Griffiths Phase, here occurring in the 150 K < T < 205 K range. The M(H) curves carried after cooling the system in zero field have showed that La1.5Sr0.5CoMn0.5Fe0.5O6 exhibits the spontaneous Exchange Bias effect at low temperatures, while for the measurements carried after cooling the system in the presence of a external magnetic field it is observed a significant enhancement of the shift in the M(H) curve. |
publishDate |
2021 |
dc.date.accessioned.fl_str_mv |
2021-03-17T11:44:48Z |
dc.date.available.fl_str_mv |
2021-03-17T11:44:48Z |
dc.date.issued.fl_str_mv |
2021-02-26 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SILVA, A. G. Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6. 2021. 90 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2021. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/11155 |
dc.identifier.dark.fl_str_mv |
ark:/38995/001300000dsj2 |
identifier_str_mv |
SILVA, A. G. Caracterização estrutural e investigação do efeito exchange bias espontâneo na perovskita dupla La1,5Sr0,5CoMn0,5Fe0,5O6. 2021. 90 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2021. ark:/38995/001300000dsj2 |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/11155 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
54 |
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500 500 500 500 |
dc.relation.department.fl_str_mv |
25 |
dc.relation.cnpq.fl_str_mv |
583 |
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5 |
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 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 |
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