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Título:
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Surface magnetism in ZnO/Co_3O_4 mixtures
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Autores:
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Garcia March, M. A. ;
Jimenez Villacorta, F. ;
Quesada, A. ;
De la Venta, J. ;
Carmona Tejero, Noemi ;
Lorite, I. ;
LLopis, J. ;
Fernandez, J. F.
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Tipo de documento:
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texto impreso
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Editorial:
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American Institute of Physics, 2010-01-15
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co_3O_4 despite the diamagnetic and antiferromagnetic character of these oxides, respectively. Here, we present a detailed study on the electronic structure of this material in order to account for the unexpected ferromagnetism. Electrostatic interactions between both oxides lead to a dispersion of Co_3O_4 particles over the surface of ZnO larger ones. As a consequence, the reduction Co^(+3) -> Co^(2+) at the particle surface takes place as evidenced by x-ray absorption spectroscopy measurements and optical spectroscopy. This reduction allows explaining the observed ferromagnetic signal within the well established theories of magnetism in oxides.
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En línea:
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https://eprints.ucm.es/32694/1/Carmona%20Tejero%2002%20LIBRE.pdf
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