Difference in magnetic properties between Co-doped ZnO powder and thin film |
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| Authors: | Liu Xue-Chao Shi Er-Wei Chen Zhi-Zhan Zhang Hua-Wei Zhang Tao and Song Li-Xin |
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| Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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| 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. |
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| Keywords: | ZnO Co-doped crystalline orientation magnetism |
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