中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1770-1775.doi: 10.1088/1009-1963/16/6/049

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Difference in magnetic properties between Co-doped ZnO powder and thin film

施尔畏1, 宋力昕1, 刘学超2, 陈之战2, 张华伟2, 张涛2   

  1. (1)Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; (2)Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2006-09-15 修回日期:2006-11-29 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the Shanghai Nanotechnology Promotion Center (Grant No~0452nm071).

Difference in magnetic properties between Co-doped ZnO powder and thin film

Liu Xue-Chao(刘学超)a) b), Shi Er-Wei(施尔畏)a), Chen Zhi-Zhan(陈之战)a)†, Zhang Hua-Wei(张华伟)a) b), Zhang Tao(张涛)a) b), and Song Li-Xin(宋力昕)a)   

  1. a Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2006-09-15 Revised:2006-11-29 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the Shanghai Nanotechnology Promotion Center (Grant No~0452nm071).

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摘要： This paper reports that the Zn$_{0.95}$Co$_{0.05}$O polycrystalline powder and thin film were prepared by sol-gel technique under the similar preparation conditions. The former does not show typical ferromagnetic behaviour, while the latter exhibits obvious ferromagnetic properties at 5 K and room temperature. The UV--vis spectra and x-ray absorption spectra show that Co$^{2 + }$ ions are homogeneously incorporated into ZnO lattice without forming secondary phases. The distinct difference between film and powder sample is the $c$-axis (002) preferential orientation indicated by the x-ray diffraction pattern and field emission scanning electron microscopy measurement, which may be the reason why Zn$_{0.95}$Co$_{0.05}$O film shows ferromagnetic behaviour.

关键词: ZnO, Co-doped, crystalline orientation, magnetism

Abstract: This paper reports that the Zn$_{0.95}$Co$_{0.05}$O polycrystalline powder and thin film were prepared by sol-gel technique under the similar preparation conditions. The former does not show typical ferromagnetic behaviour, while the latter exhibits obvious ferromagnetic properties at 5 K and room temperature. The UV--vis spectra and x-ray absorption spectra show that Co$^{2 + }$ ions are homogeneously incorporated into ZnO lattice without forming secondary phases. The distinct difference between film and powder sample is the $c$-axis (002) preferential orientation indicated by the x-ray diffraction pattern and field emission scanning electron microscopy measurement, which may be the reason why Zn$_{0.95}$Co$_{0.05}$O film shows ferromagnetic behaviour.

Key words: ZnO, Co-doped, crystalline orientation, magnetism

中图分类号:  (Magnetic properties of monolayers and thin films)

  • 75.70.Ak
75.50.Pp (Magnetic semiconductors) 78.40.Fy (Semiconductors) 78.40.Pg (Disordered solids) 78.66.Hf (II-VI semiconductors) 78.70.Dm (X-ray absorption spectra)