中国物理B ›› 2009, Vol. 18 ›› Issue (9): 4025-4029.doi: 10.1088/1674-1056/18/9/068

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Role of defects in magnetic properties of Fe-doped SnO2 films fabricated by the Sol--Gel method

周雪云1, 葛世慧1, 左亚路1, 肖玉华1, 张莉1, 李明杰1, 韩秀峰2, 温振超2   

  1. (1)Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China; (2)State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2008-09-12 修回日期:2008-10-10 出版日期:2009-09-20 发布日期:2009-09-20

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)   

  1. 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
  • Received:2008-09-12 Revised:2008-10-10 Online:2009-09-20 Published:2009-09-20

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摘要： 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.

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.

Key words: diluted magnetic oxides, BMP model, defects

中图分类号:  (Sol-gel processing, precipitation)

  • 81.20.Fw
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.50.Dd (Nonmetallic ferromagnetic materials) 75.50.Pp (Magnetic semiconductors) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 81.40.Gh (Other heat and thermomechanical treatments)