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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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Official URL: http://dx.doi.org/10.1103/PhysRevB.79.144405
Abstract
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.
Item Type: | Article |
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Additional Information: | ©2009 The American Physical Society. |
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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