Insights into the room temperature magnetism of Zn O ∕ Co 3 O 4 mixtures

The origin of room temperature (RT) 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 Zn O ∕ Co 3 O 4 mixtures without thermal treatment. In this study, it is shown t...

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Published in:Journal of applied physics 2008-04, Vol.103 (8), p.083905-083905-4
Main Authors: Martín-González, M. S., Fernández, J. F., Rubio-Marcos, F., Lorite, I., Costa-Krämer, J. L., Quesada, A., Bañares, M. A., Fierro, J. L. G.
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Summary:The origin of room temperature (RT) 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 Zn O ∕ Co 3 O 4 mixtures without thermal treatment. In this study, it is shown that the magnetism seems to be related to surface reduction of the Co 3 O 4 nanoparticles, in which, an antiferromagnetic Co 3 O 4 nanoparticle (core) is surrounded by a CoO-like shell. This singular superficial magnetism has also been found in other mixtures with semiconductors such as Ti O 2 and insulators such as Al 2 O 3 .
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2904862