Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jallcom.2015.09.084 http://hdl.handle.net/11449/160967 |
Resumo: | The nature of the room temperature ferromagnetism in dilute magnetic oxides is still a matter of debate. However, there is a consensus that structural point defects play an important role to achieve a desired long range ferromagnetic order. In this report we have clearly established a correlation between an observed room temperature ferromagnetism and defects at zinc sites for Mn-doped ZnO (Zn0.93Mn0.03O) samples prepared by the solid state reaction method and subject to post-annealing under reducing atmosphere. Detailed microstructural analysis was carried out to exclude the presence of extrinsic sources of ferromagnetism. Photoluminescence and Hall measurements reveal that the main present defects in the samples are associated to defects at the zinc sites. Magnetic characterization demonstrates a room temperature ferromagnetic behavior associated to a paramagnetic Curie-Weiss component. The magnetization and density of defects expressively reduces after the post-annealing. In this context, the defect mediated magnetic coupling between Mn atoms under the scope of the bound magnetic polaron model and the d(0) ferromagnetism are used to interpret the magnetic properties. (C) 2015 Elsevier B.V. All rights reserved. |
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Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnODilute magnetic oxidesMn-doped ZnODefect related magnetismStructural and magnetic characterizationThe nature of the room temperature ferromagnetism in dilute magnetic oxides is still a matter of debate. However, there is a consensus that structural point defects play an important role to achieve a desired long range ferromagnetic order. In this report we have clearly established a correlation between an observed room temperature ferromagnetism and defects at zinc sites for Mn-doped ZnO (Zn0.93Mn0.03O) samples prepared by the solid state reaction method and subject to post-annealing under reducing atmosphere. Detailed microstructural analysis was carried out to exclude the presence of extrinsic sources of ferromagnetism. Photoluminescence and Hall measurements reveal that the main present defects in the samples are associated to defects at the zinc sites. Magnetic characterization demonstrates a room temperature ferromagnetic behavior associated to a paramagnetic Curie-Weiss component. The magnetization and density of defects expressively reduces after the post-annealing. In this context, the defect mediated magnetic coupling between Mn atoms under the scope of the bound magnetic polaron model and the d(0) ferromagnetism are used to interpret the magnetic properties. (C) 2015 Elsevier B.V. All rights reserved.Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)FINEPMINECOFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ Fed Ouro Preto, Ouro Preto, MG, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, Dept Fis, BR-13500970 Rio Claro, SP, BrazilUniv Fed Alfenas, BR-37130000 Alfenas, MG, BrazilUniv Sao Paulo, Inst Fis, Sao Paulo, SP, BrazilCtr Desenvolvimento Tecnol Nucl CNEN, Belo Horizonte, MG, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, Dept Fis, BR-13500970 Rio Claro, SP, BrazilFAPEMIG: APQ-02600-12CNPq: 476870/2011-9CAPES: PNPD-2011FINEP: 134/08MINECO: MAT2012-33483Elsevier B.V.Univ Fed Ouro PretoUniversidade Estadual Paulista (Unesp)Univ Fed AlfenasUniversidade de São Paulo (USP)Ctr Desenvolvimento Tecnol Nucl CNENAlmeida, V. M. deMesquita, A. [UNESP]Zevallos, A. O. deMamani, N. C.Neves, P. P.Gratens, X.Chitta, V. A.Ferraz, W. B.Doriguetto, A. C.Sabioni, A. C. S.Carvalho, H. B. de2018-11-26T16:17:26Z2018-11-26T16:17:26Z2016-01-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article406-414application/pdfhttp://dx.doi.org/10.1016/j.jallcom.2015.09.084Journal Of Alloys And Compounds. Lausanne: Elsevier Science Sa, v. 655, p. 406-414, 2016.0925-8388http://hdl.handle.net/11449/16096710.1016/j.jallcom.2015.09.084WOS:000364603100054WOS000364603100054.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Alloys And Compounds1,020info:eu-repo/semantics/openAccess2023-12-10T06:22:43Zoai:repositorio.unesp.br:11449/160967Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-10T06:22:43Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
title |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
spellingShingle |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO Almeida, V. M. de Dilute magnetic oxides Mn-doped ZnO Defect related magnetism Structural and magnetic characterization |
title_short |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
title_full |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
title_fullStr |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
title_full_unstemmed |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
title_sort |
Room temperature ferromagnetism promoted by defects at zinc sites in Mn-doped ZnO |
author |
Almeida, V. M. de |
author_facet |
Almeida, V. M. de Mesquita, A. [UNESP] Zevallos, A. O. de Mamani, N. C. Neves, P. P. Gratens, X. Chitta, V. A. Ferraz, W. B. Doriguetto, A. C. Sabioni, A. C. S. Carvalho, H. B. de |
author_role |
author |
author2 |
Mesquita, A. [UNESP] Zevallos, A. O. de Mamani, N. C. Neves, P. P. Gratens, X. Chitta, V. A. Ferraz, W. B. Doriguetto, A. C. Sabioni, A. C. S. Carvalho, H. B. de |
author2_role |
author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Univ Fed Ouro Preto Universidade Estadual Paulista (Unesp) Univ Fed Alfenas Universidade de São Paulo (USP) Ctr Desenvolvimento Tecnol Nucl CNEN |
dc.contributor.author.fl_str_mv |
Almeida, V. M. de Mesquita, A. [UNESP] Zevallos, A. O. de Mamani, N. C. Neves, P. P. Gratens, X. Chitta, V. A. Ferraz, W. B. Doriguetto, A. C. Sabioni, A. C. S. Carvalho, H. B. de |
dc.subject.por.fl_str_mv |
Dilute magnetic oxides Mn-doped ZnO Defect related magnetism Structural and magnetic characterization |
topic |
Dilute magnetic oxides Mn-doped ZnO Defect related magnetism Structural and magnetic characterization |
description |
The nature of the room temperature ferromagnetism in dilute magnetic oxides is still a matter of debate. However, there is a consensus that structural point defects play an important role to achieve a desired long range ferromagnetic order. In this report we have clearly established a correlation between an observed room temperature ferromagnetism and defects at zinc sites for Mn-doped ZnO (Zn0.93Mn0.03O) samples prepared by the solid state reaction method and subject to post-annealing under reducing atmosphere. Detailed microstructural analysis was carried out to exclude the presence of extrinsic sources of ferromagnetism. Photoluminescence and Hall measurements reveal that the main present defects in the samples are associated to defects at the zinc sites. Magnetic characterization demonstrates a room temperature ferromagnetic behavior associated to a paramagnetic Curie-Weiss component. The magnetization and density of defects expressively reduces after the post-annealing. In this context, the defect mediated magnetic coupling between Mn atoms under the scope of the bound magnetic polaron model and the d(0) ferromagnetism are used to interpret the magnetic properties. (C) 2015 Elsevier B.V. All rights reserved. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01-15 2018-11-26T16:17:26Z 2018-11-26T16:17:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jallcom.2015.09.084 Journal Of Alloys And Compounds. Lausanne: Elsevier Science Sa, v. 655, p. 406-414, 2016. 0925-8388 http://hdl.handle.net/11449/160967 10.1016/j.jallcom.2015.09.084 WOS:000364603100054 WOS000364603100054.pdf |
url |
http://dx.doi.org/10.1016/j.jallcom.2015.09.084 http://hdl.handle.net/11449/160967 |
identifier_str_mv |
Journal Of Alloys And Compounds. Lausanne: Elsevier Science Sa, v. 655, p. 406-414, 2016. 0925-8388 10.1016/j.jallcom.2015.09.084 WOS:000364603100054 WOS000364603100054.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Alloys And Compounds 1,020 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
406-414 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965241049612288 |