Defect induced room temperature ferromagnetism in high quality Co-doped ZnO bulk samples

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dc.contributor.authorde Godoy, M. P.F.
dc.contributor.authorGratens, X.
dc.contributor.authorChitta, V. A.
dc.contributor.authorMesquita, A. [UNESP]
dc.contributor.authorde Lima, M. M.
dc.contributor.authorCantarero, A.
dc.contributor.authorRahman, G.
dc.contributor.authorMorbec, J. M.
dc.contributor.authorde Carvalho, H. B.
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Valencia
dc.contributor.institutionQuaid-i-Azam University
dc.contributor.institutionKeele University
dc.contributor.institutionUniversidade Federal de Alfenas - UNIFAL
dc.date.accessioned2021-06-25T10:44:42Z
dc.date.available2021-06-25T10:44:42Z
dc.date.issued2021-04-05
dc.description.abstractThe nature of the often reported room temperature ferromagnetism in transition metal doped oxides is still a matter of huge debate. Herein we report on room temperature ferromagnetism in high quality Co-doped ZnO (Zn1−xCoxO) bulk samples synthesized via standard solid-state reaction route. Reference paramagnetic Co-doped ZnO samples with low level of structural defects are subjected to heat treatments in a reductive atmosphere in order to introduce defects in the samples in a controlled way. A detailed structural analysis is carried out in order to characterize the induced defects and their concentration. The magnetometry revealed the coexistence of a paramagnetic and a ferromagnetic phase at room temperature in straight correlation with the structural properties. The saturation magnetization is found to increase with the intensification of the heat treatment, and, therefore, with the increase of the density of induced defects. The magnetic behavior is fully explained in terms of the bound magnetic polaron model. Based on the experimental findings, supported by theoretical calculations, we attribute the origin of the observed defect-induced-ferromagnetism to the ferromagnetic coupling between the Co ions mediated by magnetic polarons due to zinc interstitial defects.en
dc.description.affiliationDepartamento de Física Universidade Federal de São Carlos - UFSCar, São Carlos
dc.description.affiliationInstituto de Física Universidade de São Paulo - USP, São Paulo
dc.description.affiliationDepartamento de Física Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista – UNESP
dc.description.affiliationMaterials Science Institute University of Valencia, 22085
dc.description.affiliationInstitute of Molecular Science University of Valencia, 22085
dc.description.affiliationDepartment of Physics Quaid-i-Azam University
dc.description.affiliationSchool of Chemical and Physical Sciences Keele University, Keele ST5 5BG
dc.description.affiliationUniversidade Federal de Alfenas - UNIFAL, Alfenas
dc.description.affiliationUnespDepartamento de Física Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista – UNESP
dc.description.sponsorshipHigher Education Commission, Pakistan
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 07/56231-0
dc.description.sponsorshipIdFAPESP: 2015/16191-5
dc.description.sponsorshipIdCNPq: 306715/2018-0
dc.identifierhttp://dx.doi.org/10.1016/j.jallcom.2020.157772
dc.identifier.citationJournal of Alloys and Compounds, v. 859.
dc.identifier.doi10.1016/j.jallcom.2020.157772
dc.identifier.issn0925-8388
dc.identifier.scopus2-s2.0-85096089766
dc.identifier.urihttp://hdl.handle.net/11449/206838
dc.language.isoeng
dc.relation.ispartofJournal of Alloys and Compounds
dc.sourceScopus
dc.subjectDefect engineering
dc.subjectDoped oxides
dc.subjectFerromagnetism
dc.subjectSpintronics
dc.titleDefect induced room temperature ferromagnetism in high quality Co-doped ZnO bulk samplesen
dc.typeArtigo

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