Insights into the room temperature magnetism of ZnO/Co3O4 mixtures

Details Insights into the room temperature magnetism of ZnO/Co3O4 mixtures Insights into the room temperature magnetism of ZnO/Co3O4 mixtures

2009-01-12

arxiv.org/abs/0901.1591v1

JOURNAL OF APPLIED PHYSICS 103, 083905 (2008)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1063/1.2904862

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 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.

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