Valence state, lattice incorporation, and resulting magnetic properties of Ni in Zn/Co-based magnetic oxides

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dc.contributor.authorNey, V.
dc.contributor.authorHenne, B.
dc.contributor.authorSouza, M. de [UNESP]
dc.contributor.authorJantsch, W.
dc.contributor.authorJohansen, K. M.
dc.contributor.authorWilhelm, F.
dc.contributor.authorRogalev, A.
dc.contributor.authorNey, A.
dc.contributor.institutionJohannes Kepler Univ Linz
dc.contributor.institutionUniv Oslo
dc.contributor.institutionEuropean Synchrotron Radiat Facil ESRF
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-07-29T11:58:48Z
dc.date.available2023-07-29T11:58:48Z
dc.date.issued2023-01-21
dc.description.abstractNi incorporation has been studied in a comprehensive range of Zn/Co-based magnetic oxides to elucidate its valence state and lattice incorporation. The resulting structural and magnetic properties of a range of related types of samples are studied in detail. On the one hand, Ni doping is studied in wurtzite ZnO which is either done by in-diffusion of the Ni into bulk ZnO or by reactive magnetron sputtering for Nidoped thin films of ZnO. The latter is complemented by Ni and Co codoping of ZnO leading to altered magnetic properties which are then dominated by Co. On the other hand, the ZnCo2O4 spinel is codoped with varying amounts of Ni. In the wurtzite oxides, Ni is exclusively found on tetrahedral lattice sites in its formal 2+ oxidation state as deep donor. It behaves as an anisotropic paramagnet, and a limited solubility of Ni below 10% is found. Furthermore, the partial compensation of the antiferromagnetically coupled Co magnetic moments is induced by the Ni due to its smaller magnetic moment. In the ZnCo2O4 spinel, Ni is found to be incorporated in its formal 3+ oxidation state on octahedral sites and also couples antiferromagnetically to the Co moments. At low Ni concentrations, this leads to a lifting of the partial magnetic compensation of the antiferromagnetic ZnCo2O4 spinel and to ferrimagnetism at higher Ni concentrations. Increasing the Ni concentration even further leads to phase separation of cubic NiO resulting in a structurally less defined, exchange-biased composite magnetic oxide.en
dc.description.affiliationJohannes Kepler Univ Linz, Inst Halbleiter & Festkorperphys, Altenberger Str 69, A-4040 Linz, Austria
dc.description.affiliationUniv Oslo, Ctr Mat Sci & Nanotechnol, Dept Phys, N-0316 Oslo, Norway
dc.description.affiliationEuropean Synchrotron Radiat Facil ESRF, CS 40220, F-38043 Grenoble, France
dc.description.affiliationUnesp Univ Estadual Paulista, Dept Fis, IGCE, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUnesp Univ Estadual Paulista, Dept Fis, IGCE, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipAustrian Science Fund (FWF)
dc.description.sponsorshipResearch Council of Norway
dc.description.sponsorshipIdAustrian Science Fund (FWF): P26164-N20
dc.description.sponsorshipIdResearch Council of Norway: 295864
dc.description.sponsorshipIdResearch Council of Norway: 314017
dc.format.extent21
dc.identifierhttp://dx.doi.org/10.1063/5.0130731
dc.identifier.citationJournal of Applied Physics. Melville: Aip Publishing, v. 133, n. 3, 21 p., 2023.
dc.identifier.doi10.1063/5.0130731
dc.identifier.issn0021-8979
dc.identifier.urihttp://hdl.handle.net/11449/245572
dc.identifier.wosWOS:000918075300007
dc.language.isoeng
dc.publisherAip Publishing
dc.relation.ispartofJournal Of Applied Physics
dc.sourceWeb of Science
dc.titleValence state, lattice incorporation, and resulting magnetic properties of Ni in Zn/Co-based magnetic oxidesen
dc.typeArtigo
dcterms.rightsHolderAip Publishing
unesp.author.orcid0000-0002-2466-3402[3]

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