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



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Serrano, A., A. and Plaza, M. and Pérez García, Lucas and Venta, J. de la and LLopis, J. and García, M. A. (2009) Room-temperature ferromagnetism in the mixtures of the TiO₂ and Co₃O₄ powders. Physical review B, 79 (14). ISSN 1098-0121

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We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO₂ and Co₃O₄ powders despite the antiferromagnetic and diamagnetic characters 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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©2009 The American Physical Society.
Artículo firmado por más de diez autores.
This work was supported by the Spanish Council for Scientific Research through the CSIC Projects No. 2006- 50F0122 and No. 2007-50I015 and Spanish Ministry of Science and Education through the Projects No. MAT2007- 66845-C02-01 and No. FIS-2008-06249. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities, and we would like to thank the SpLine CRG Beamline staff for assistance during x-ray absorption experiments.

Uncontrolled Keywords:Magnetic semiconductors; Oxides; ZnO
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45455
Deposited On:21 Nov 2017 12:55
Last Modified:11 Dec 2017 09:37

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