RT Journal Article
T1 Surface magnetism in ZnO/Co_3O_4 mixtures
A1 Garcia March, M. A.
A1 Jimenez Villacorta, F.
A1 Quesada, A.
A1 de la Venta, J.
A1 Carmona Tejero, Noemí
A1 Lorite, I.
A1 LLopis, J.
A1 Fernández, J. F.
AB 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.
PB American Institute of Physics
SN 0021-8979
YR 2010
FD 2010-01-15
LK https://hdl.handle.net/20.500.14352/44716
UL https://hdl.handle.net/20.500.14352/44716
LA eng
NO © 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.
NO Spanish Council for Scientific Research
NO Ministry of Science and Education, Spain
DS Docta Complutense
RD 24 abr 2025