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Insights into the room temperature magnetism of ZnO/Co3O4 mixtures

AuthorsMartín-González, Marisol; Fernández Lozano, José Francisco ; Rubio Marcos, Fernando ; Lorite, Israel ; Costa Krämer, José Luis ; Quesada, Adrián ; Bañares González, Miguel Ángel; García Fierro, José Luis
Issue DateMay-2008
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 103(8): 083905 (2008)
AbstractThe origin of room temperature ferromagneticlike behavior in ZnO-based diluted magnetic semiconductors is still an unclear topic. The present work concentrates on the appearance of RT magnetic moments in just mixed ZnO/Co3O4 mixtures without thermal treatment. In this study, it is shown that the magnetism seems to be related to surface reduction of the Co3O4 nanoparticles, in which, an antiferromagnetic Co3O4 nanoparticle core is surrounded by a CoO-like shell. This singular superficial magnetism has also been found in other mixtures with semiconductors such as TiO2 and insulators such as Al2O3.
Publisher version (URL)http://dx.doi.org/10.1063/1.2904862
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