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Chinese Physics, 2007, Vol. 16(6): 1770-1775    DOI: 10.1088/1009-1963/16/6/049
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)
a Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
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.
Keywords:  ZnO      Co-doped      crystalline orientation      magnetism  
Received:  15 September 2006      Revised:  29 November 2006      Accepted manuscript online: 
PACS:  75.70.Ak (Magnetic properties of monolayers and thin films)  
  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)  
Fund: Project supported by the Shanghai Nanotechnology Promotion Center (Grant No~0452nm071).

Cite this article: 

Liu Xue-Chao(刘学超), Shi Er-Wei(施尔畏), Chen Zhi-Zhan(陈之战), Zhang Hua-Wei(张华伟), Zhang Tao(张涛), and Song Li-Xin(宋力昕) Difference in magnetic properties between Co-doped ZnO powder and thin film 2007 Chinese Physics 16 1770

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