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dc.contributor.authorOliveira, Aline Alvespt_BR
dc.contributor.authorValerio-Cuadros, Marlon Ivanpt_BR
dc.contributor.authorBrito, Alex Soares dept_BR
dc.contributor.authorTupan, Lilian Felipe da Silvapt_BR
dc.contributor.authorIvashita, Flávio Franciscopt_BR
dc.contributor.authorGeshev, Julian Penkovpt_BR
dc.contributor.authorPaesano Junior, Andreapt_BR
dc.date.accessioned2021-01-07T04:16:40Zpt_BR
dc.date.issued2020pt_BR
dc.identifier.issn2158-3226pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/217094pt_BR
dc.description.abstractCu1−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.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofAIP Advances. Melville, NY. Vol. 10, no. 6 (June 2020), 065009, 8 p.pt_BR
dc.rightsOpen Accessen
dc.subjectNanopartículaspt_BR
dc.subjectFerromagnetismopt_BR
dc.subjectÓxido de cobrept_BR
dc.subjectDopagempt_BR
dc.titleCore–shell behavior and exchange bias of Fe-doped CuO nanoparticlespt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001115929pt_BR
dc.type.originEstrangeiropt_BR


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