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Surface magnetism in ZnO/Co3O4 mixtures

AuthorsGarcía García-Tuñón, Miguel Ángel ; Jiménez-Villacorta, Félix ; Quesada, Adrián ; Venta, José de la ; Carmona, N. ; Lorite, Israel ; Llopis, J.; Fernández Lozano, José Francisco
Issue Date23-Feb-2010
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics Beta 107(4): 043906 (2010)
AbstractWe recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co3O4 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 Co3O4 particles over the surface of ZnO larger ones. As a consequence, the reduction Co+3→Co2+ 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.
Description5 pages, 7 figures.
Publisher version (URL)http://dx.doi.org/10.1063/1.3294649
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