Surface magnetism in ZnO/Co_3O_4 mixtures



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Garcia March, M. A. and Jimenez Villacorta, F. and Quesada, A. and de la Venta, J. and Carmona Tejero, Noemí and Lorite, I. and LLopis, J. and Fernández, J. F. (2010) Surface magnetism in ZnO/Co_3O_4 mixtures. Journal of applied physics, 107 (4). ISSN 0021-8979

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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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© 2010 American Institute of Physics.

Lucas Pérez and Manuel Plaza are acknowledged for the help with the magnetic measurements. M.S. Martín-González and J. L. Costa-Krämer are acknowledged for fruitful discussions. This work was supported by the Spanish Council for Scientific Research through Project Nos. CSIC 2006-50F0122 and CSIC 2007-50I015 and Spanish Ministry of Science and Education through Project Nos. MAT2007- 66845-C02-01 and 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:Room-temperature; Doped ZnO; Sol-gel; Ferromagnetism; Oxide
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:32694
Deposited On:29 Jul 2015 09:53
Last Modified:29 Jul 2015 09:53

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