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.
Received: 15 September 2006
Revised: 29 November 2006
Accepted manuscript online:
PACS:
75.70.Ak
(Magnetic properties of monolayers and thin films)
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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