Role of defects in magnetic properties of Fe-doped SnO2 films fabricated by the Sol--Gel method
Zhou Xue-Yun(周雪云)a)†ger, Ge Shi-Hui(葛世慧)a)‡ger, Han Xiu-Feng(韩秀峰)b), Zuo Ya-Lu(左亚路)a), Xiao Yu-Hua(肖玉华)a), Wen Zhen-Chao(温振超)b), Zhang Li(张莉)a), and Li Ming-Jie(李明杰)a)
a Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China; b State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract This paper obtains the room temperature ferromagnetism in Sn1-xFexO2 films fabricated by the Sol--Gel method. X-ray diffraction results show that Fe doping inhibits the growth of SnO2 and Fe3+ ions occupy the Sn sites. The measurement of resistance excludes the free carrier inducing ferromagnetism. Moreover, the temperature dependence of magnetization has been better fitted by the Curie--Weiss law and bound magnetic polaron (BMP) theory. An enhancement of ferromagnetism is achieved by annealing the samples with x=7.1% in H2, and a decrease of oxygen flow rate. All these results prove that the BMP model depending on defects can explain ferromagnetism in diluted magnetic oxides.
Received: 12 September 2008
Revised: 10 October 2008
Accepted manuscript online:
Zhou Xue-Yun(周雪云), Ge Shi-Hui(葛世慧), Han Xiu-Feng(韩秀峰), Zuo Ya-Lu(左亚路), Xiao Yu-Hua(肖玉华), Wen Zhen-Chao(温振超), Zhang Li(张莉), and Li Ming-Jie(李明杰) Role of defects in magnetic properties of Fe-doped SnO2 films fabricated by the Sol--Gel method 2009 Chin. Phys. B 18 4025
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