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oai:docta.ucm.es:20.500.14352/427772023-08-28T18:43:33Zcom_20.500.14352_14col_20.500.14352_15

Room-temperature ferromagnetism in the mixtures of the TiO₂ and Co₃O₄ powders Serrano, A., A. Plaza, M. Pérez García, Lucas Venta, J. de la LLopis, J. García, M. A. 538.9 Magnetic semiconductors Oxides ZnO Física de materiales Física del estado sólido 2211 Física del Estado Sólido ©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. 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. Ministerio de Ciencia y Educación Spanish Council for Scientific Research Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2023-06-20T00:35:45Z 2023-06-20T00:35:45Z 2009-04 journal article https://hdl.handle.net/20.500.14352/42777 1098-0121 10.1103/PhysRevB.79.144405 eng MAT2007- 66845-C02-01 FIS-2008-06249 2006- 50F0122 2007-50I015 open access application/pdf American Physical Society