Journal
THIN SOLID FILMS
Volume 517, Issue 21, Pages 6091-6095Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.05.008
Keywords
Diluted magnetic oxides; Co-doped SnO2; Structural defect; Bound magnetic polarons
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Funding
- National Natural Science Foundation of China [50471011, 50525101, 50729101]
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Co-cloped SnO2 insulating films with different crystal quality were fabricated using magnetron sputtering. X-ray photoelectron spectroscopy and X-ray absorption near-edge structure spectrum reveal a solid solution of Co dopants in SnO2 lattice, where Co is in 2+ oxidation state and substitutes for Sn4+. The as-grown films with different crystallinity exhibit clearly room-temperature ferromagnetism, and the films with more structural defects show higher saturated magnetic moment. With the increase of annealing time, the crystallinity of the films is improved and the defects decrease, leading to the decrease or disappearance of ferromagnetism in the films. The results show that the ferromagnetism in Co-cloped SnO2 films is intrinsic and can be considerably influenced by the concentration of structural defects. (C) 2009 Elsevier B.V. All rights reserved.
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