Defect induced room temperature ferromagnetism in high quality Co-doped ZnO bulk samples
dc.contributor.author | de Godoy, M. P.F. | |
dc.contributor.author | Gratens, X. | |
dc.contributor.author | Chitta, V. A. | |
dc.contributor.author | Mesquita, A. [UNESP] | |
dc.contributor.author | de Lima, M. M. | |
dc.contributor.author | Cantarero, A. | |
dc.contributor.author | Rahman, G. | |
dc.contributor.author | Morbec, J. M. | |
dc.contributor.author | de Carvalho, H. B. | |
dc.contributor.institution | Universidade Federal de São Carlos (UFSCar) | |
dc.contributor.institution | Universidade de São Paulo (USP) | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | University of Valencia | |
dc.contributor.institution | Quaid-i-Azam University | |
dc.contributor.institution | Keele University | |
dc.contributor.institution | Universidade Federal de Alfenas - UNIFAL | |
dc.date.accessioned | 2021-06-25T10:44:42Z | |
dc.date.available | 2021-06-25T10:44:42Z | |
dc.date.issued | 2021-04-05 | |
dc.description.abstract | The 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.affiliation | Departamento de Física Universidade Federal de São Carlos - UFSCar, São Carlos | |
dc.description.affiliation | Instituto de Física Universidade de São Paulo - USP, São Paulo | |
dc.description.affiliation | Departamento de Física Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista – UNESP | |
dc.description.affiliation | Materials Science Institute University of Valencia, 22085 | |
dc.description.affiliation | Institute of Molecular Science University of Valencia, 22085 | |
dc.description.affiliation | Department of Physics Quaid-i-Azam University | |
dc.description.affiliation | School of Chemical and Physical Sciences Keele University, Keele ST5 5BG | |
dc.description.affiliation | Universidade Federal de Alfenas - UNIFAL, Alfenas | |
dc.description.affiliationUnesp | Departamento de Física Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista – UNESP | |
dc.description.sponsorship | Higher Education Commission, Pakistan | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
dc.description.sponsorshipId | FAPESP: 07/56231-0 | |
dc.description.sponsorshipId | FAPESP: 2015/16191-5 | |
dc.description.sponsorshipId | CNPq: 306715/2018-0 | |
dc.identifier | http://dx.doi.org/10.1016/j.jallcom.2020.157772 | |
dc.identifier.citation | Journal of Alloys and Compounds, v. 859. | |
dc.identifier.doi | 10.1016/j.jallcom.2020.157772 | |
dc.identifier.issn | 0925-8388 | |
dc.identifier.scopus | 2-s2.0-85096089766 | |
dc.identifier.uri | http://hdl.handle.net/11449/206838 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Alloys and Compounds | |
dc.source | Scopus | |
dc.subject | Defect engineering | |
dc.subject | Doped oxides | |
dc.subject | Ferromagnetism | |
dc.subject | Spintronics | |
dc.title | Defect induced room temperature ferromagnetism in high quality Co-doped ZnO bulk samples | en |
dc.type | Artigo |