期刊
THIN SOLID FILMS
卷 516, 期 10, 页码 3223-3226出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.06.168
关键词
diluted magnetic semiconductors; room-temperature ferromagnetism; oxygen vacancy
We report here the observation of significant room-temperature ferromagnetism in a semiconductor doped with nonmagnetic impurities, Cu-doped TiO2 thin films grown by reactive magnetron sputtering. Films annealed in air were not magnetic while those annealed in vacuum were ferromagnetic with a Curie temperature about 350 K. The magnetic moment per copper atom decreased as the copper concentration increased. These results show that both the oxygen vacancies and the distance between nearest-neighbor copper atoms play a crucial role for the appearance of magnetism. (c) 2007 Elsevier B.V All rights reserved.
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