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Nitrogen doping-mediated room-temperature ferromagnetism in insulating Co-doped SnO2 films

✍ Scribed by X.F. Liu; Javed Iqbal; S.L. Yang; B. He; R.H. Yu

Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 281 KB
Volume: 256
Category: Article
ISSN: 0169-4332
DOI: 10.1016/j.apsusc.2010.01.079

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✦ Synopsis

Co-doped SnO 2 films codoped with nitrogen (N) have been prepared by magnetron sputtering to investigate the effect of p-type defects on magnetic properties. The incorporation of N modifies the preferential growth orientation of the films. Multiple characterization techniques reveal that the incorporated Co 2+ and N 3À ions substitute for Sn 4+ and O 2À sites in SnO 2 lattice, respectively. As N concentration increases, the band gap of the films decreases because of the formation of Sn-N bond. Room-temperature ferromagnetism is observed in (Co, N)-codoped SnO 2 films, and the saturated magnetic moment is sensitive to the incorporated N concentration. The variations in the magnetic properties as a function of N concentration are discussed on the basis of bound magnetic polaron model.

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