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Title: Surface magnetism in ZnO/Co3O4 mixtures
Authors: García, M. A., Jiménez-Villacorta, Félix, Quesada, Adrián, Venta, J. de la, Carmona, N., Lorite, Israel, Llopis, J., Fernández Lozano, José Francisco
Issue Date: 23-Feb-2010
Publisher: American Institute of Physics
Abstract: We 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.
Description: 5 pages, 7 figures.
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ISSN: 0021-8979
???metadata.dc.identifier.doi???: 10.1063/1.3294649
Citation: Journal of Applied Physics Beta 107(4): 043906 (2010)
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