期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3294649
关键词
cobalt compounds; electronic structure; electrostatics; ferromagnetic materials; II-VI semiconductors; reduction (chemical); reflectivity; semimagnetic semiconductors; surface magnetism; wide band gap semiconductors; XANES; zinc compounds
资金
- Spanish Council for Scientific Research [CSIC 2006-50F0122, CSIC 2007-50I015]
- Spanish Ministry of Science and Education [MAT2007-66845-C02-01, FIS-2008-06249]
We recently reported the observation of room temperature ferromagnetism in mixtures of ZnO and Co3O4 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 Co3O4 particles over the surface of ZnO larger ones. As a consequence, the reduction Co+3 -> Co2+ 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据