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Surface magnetism in ZnO/Co_3O_4 mixtures

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dc.contributor.authorGarcia March, M. A.
dc.contributor.authorJimenez Villacorta, F.
dc.contributor.authorQuesada, A.
dc.contributor.authorde la Venta, J.
dc.contributor.authorCarmona Tejero, Noemí
dc.contributor.authorLorite, I.
dc.contributor.authorLLopis, J.
dc.contributor.authorFernández, J. F.
dc.date.accessioned2023-06-20T03:57:09Z
dc.date.available2023-06-20T03:57:09Z
dc.date.issued2010-01-15
dc.description© 2010 American Institute of Physics. Lucas Pérez and Manuel Plaza are acknowledged for the help with the magnetic measurements. M.S. Martín-González and J. L. Costa-Krämer are acknowledged for fruitful discussions. This work was supported by the Spanish Council for Scientific Research through Project Nos. CSIC 2006-50F0122 and CSIC 2007-50I015 and Spanish Ministry of Science and Education through Project Nos. MAT2007- 66845-C02-01 and FIS-2008-06249. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities and we would like to thank the SpLine CRG beamline staff for assistance during x-ray absorption experiments.
dc.description.abstractWe recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co_3O_4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic structure of this material in order to account for the unexpected ferromagnetism. Electrostatic interactions between both oxides lead to a dispersion of Co_3O_4 particles over the surface of ZnO larger ones. As a consequence, the reduction Co^(+3) -> Co^(2+) at the particle surface takes place as evidenced by x-ray absorption spectroscopy measurements and optical spectroscopy. This reduction allows explaining the observed ferromagnetic signal within the well established theories of magnetism in oxides.
dc.description.departmentDepto. de Física de Materiales
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipSpanish Council for Scientific Research
dc.description.sponsorshipMinistry of Science and Education, Spain
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/32694
dc.identifier.doi10.1063/1.3294649
dc.identifier.issn0021-8979
dc.identifier.officialurlhttp://dx.doi.org/10.1063/1.3294649
dc.identifier.relatedurlhttp://scitation.aip.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/44716
dc.issue.number4
dc.journal.titleJournal of applied physics
dc.language.isoeng
dc.publisherAmerican Institute of Physics
dc.relation.projectIDCSIC 2006-50F0122
dc.relation.projectIDCSIC 2007-50I015
dc.relation.projectIDMAT2007-66845-C02-01
dc.relation.projectIDFIS-2008-06249
dc.rights.accessRightsopen access
dc.subject.cdu538.9
dc.subject.keywordRoom-temperature
dc.subject.keywordDoped ZnO
dc.subject.keywordSol-gel
dc.subject.keywordFerromagnetism
dc.subject.keywordOxide
dc.subject.ucmFísica de materiales
dc.subject.ucmFísica del estado sólido
dc.subject.unesco2211 Física del Estado Sólido
dc.titleSurface magnetism in ZnO/Co_3O_4 mixtures
dc.typejournal article
dc.volume.number107
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relation.isAuthorOfPublication.latestForDiscovery3255ab49-a30c-4e80-a979-23036e378fb8

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