Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders

Details Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders

2009-03-30

arxiv.org/abs/0903.5214v1

Physics

Condensed Matter

Materials Science

17 pages, 8 figures

Scientific paper

10.1103/PhysRevB.79.144405

We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO2 and Co3O4 powders despite the antiferromagnetic and diamagnetic character of both oxides respectively. The ferromagnetic behavior is found in the early stages of reaction and only for TiO2 in anatase structure; no FM is found for identical samples prepared with rutile-TiO2. Optical spectroscopy and X-ray absorption spectra confirm a surface reduction of octahedral Co+3->Co+2 in the mixtures which is in the origin of the observed magnetism

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