Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles

Detalhes bibliográficos
Autor(a) principal: Oliveira, Aline Alves
Data de Publicação: 2020
Outros Autores: Valerio-Cuadros, Marlon Ivan, Brito, Alex Soares de, Tupan, Lilian Felipe da Silva, Ivashita, Flávio Francisco, Geshev, Julian Penkov, Paesano Junior, Andrea
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/217094
Resumo: Cu1−xFexO nanoparticles were prepared using a freeze-drying process followed by heat treatment. The particles were then characterized using Mössbauer spectroscopy and magnetization techniques. The results revealed complex magnetic behavior, which can be attributed to the presence of two different magnetic regions: the particle core, which has antiferromagnetic fluctuations, and the particle shell, where uncompensated spins are responsible for their superparamagnetic characteristics. At low temperatures, the moments freeze, revealing a ferromagnetic order for the shells and a dipolar magnetic interaction among the nanoparticles. In addition, an exchange-bias field revealed magnetic interactions between the core and the shell of the nanoparticles. The ferromagnetism observed in this system suggests that antiferromagnetic oxide matrices can be used for diluted magnetic semiconductor applications, if suitably doped.
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spelling Oliveira, Aline AlvesValerio-Cuadros, Marlon IvanBrito, Alex Soares deTupan, Lilian Felipe da SilvaIvashita, Flávio FranciscoGeshev, Julian PenkovPaesano Junior, Andrea2021-01-07T04:16:40Z20202158-3226http://hdl.handle.net/10183/217094001115929Cu1−xFexO nanoparticles were prepared using a freeze-drying process followed by heat treatment. The particles were then characterized using Mössbauer spectroscopy and magnetization techniques. The results revealed complex magnetic behavior, which can be attributed to the presence of two different magnetic regions: the particle core, which has antiferromagnetic fluctuations, and the particle shell, where uncompensated spins are responsible for their superparamagnetic characteristics. At low temperatures, the moments freeze, revealing a ferromagnetic order for the shells and a dipolar magnetic interaction among the nanoparticles. In addition, an exchange-bias field revealed magnetic interactions between the core and the shell of the nanoparticles. The ferromagnetism observed in this system suggests that antiferromagnetic oxide matrices can be used for diluted magnetic semiconductor applications, if suitably doped.application/pdfengAIP Advances. Melville, NY. Vol. 10, no. 6 (June 2020), 065009, 8 p.NanopartículasFerromagnetismoÓxido de cobreDopagemCore–shell behavior and exchange bias of Fe-doped CuO nanoparticlesEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001115929.pdf.txt001115929.pdf.txtExtracted Texttext/plain29559http://www.lume.ufrgs.br/bitstream/10183/217094/2/001115929.pdf.txta904fddf1578585087bade81841a672fMD52ORIGINAL001115929.pdfTexto completo (inglês)application/pdf3325948http://www.lume.ufrgs.br/bitstream/10183/217094/1/001115929.pdf53d5d9a3a340c372ae3b33285d8e9e09MD5110183/2170942023-09-17 03:31:25.7392oai:www.lume.ufrgs.br:10183/217094Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-17T06:31:25Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
title Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
spellingShingle Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
Oliveira, Aline Alves
Nanopartículas
Ferromagnetismo
Óxido de cobre
Dopagem
title_short Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
title_full Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
title_fullStr Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
title_full_unstemmed Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
title_sort Core–shell behavior and exchange bias of Fe-doped CuO nanoparticles
author Oliveira, Aline Alves
author_facet Oliveira, Aline Alves
Valerio-Cuadros, Marlon Ivan
Brito, Alex Soares de
Tupan, Lilian Felipe da Silva
Ivashita, Flávio Francisco
Geshev, Julian Penkov
Paesano Junior, Andrea
author_role author
author2 Valerio-Cuadros, Marlon Ivan
Brito, Alex Soares de
Tupan, Lilian Felipe da Silva
Ivashita, Flávio Francisco
Geshev, Julian Penkov
Paesano Junior, Andrea
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Oliveira, Aline Alves
Valerio-Cuadros, Marlon Ivan
Brito, Alex Soares de
Tupan, Lilian Felipe da Silva
Ivashita, Flávio Francisco
Geshev, Julian Penkov
Paesano Junior, Andrea
dc.subject.por.fl_str_mv Nanopartículas
Ferromagnetismo
Óxido de cobre
Dopagem
topic Nanopartículas
Ferromagnetismo
Óxido de cobre
Dopagem
description Cu1−xFexO nanoparticles were prepared using a freeze-drying process followed by heat treatment. The particles were then characterized using Mössbauer spectroscopy and magnetization techniques. The results revealed complex magnetic behavior, which can be attributed to the presence of two different magnetic regions: the particle core, which has antiferromagnetic fluctuations, and the particle shell, where uncompensated spins are responsible for their superparamagnetic characteristics. At low temperatures, the moments freeze, revealing a ferromagnetic order for the shells and a dipolar magnetic interaction among the nanoparticles. In addition, an exchange-bias field revealed magnetic interactions between the core and the shell of the nanoparticles. The ferromagnetism observed in this system suggests that antiferromagnetic oxide matrices can be used for diluted magnetic semiconductor applications, if suitably doped.
publishDate 2020
dc.date.issued.fl_str_mv 2020
dc.date.accessioned.fl_str_mv 2021-01-07T04:16:40Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/217094
dc.identifier.issn.pt_BR.fl_str_mv 2158-3226
dc.identifier.nrb.pt_BR.fl_str_mv 001115929
identifier_str_mv 2158-3226
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url http://hdl.handle.net/10183/217094
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv AIP Advances. Melville, NY. Vol. 10, no. 6 (June 2020), 065009, 8 p.
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eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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reponame_str Repositório Institucional da UFRGS
collection Repositório Institucional da UFRGS
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