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00925njm 22002777a 4500 dc Serrano, A., A. author Plaza, M. author Pérez García, Lucas author Venta, J. de la author LLopis, J. author García, M. A. author 2009-04 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. 1098-0121 10.1103/PhysRevB.79.144405 https://hdl.handle.net/20.500.14352/42777 http://dx.doi.org/10.1103/PhysRevB.79.144405 https://journals.aps.org Room-temperature ferromagnetism in the mixtures of the TiO₂ and Co₃O₄ powders