The Effect of Substrate Temperature on the Room Temperature Ferromagnetism of Co-Doped ZnO Thin Films

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• 作者：Wang Zhuliang ; Li Xiaoli ; Jiang Fengxian ; Tian Baoqiang ; Lü ; Baohua ; Xu Xiaohong
• 关键词：Co-doped ZnO films ; magnetron co-sputtering ; substrate temperature ; ferromagnetism
• 刊名：Rare Metal Materials and Engineering
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：37
• 期：5
• 页码：831-834
• 全文大小：228 K

文摘

Zn_1-xCo_xO (x=0.08-0.31) thin films were prepared on c-cut sapphire substrates by magnetron co-sputtering. The effects of substrate temperatures on the structures and magnetic properties of Co-doping ZnO thin films were investigated. The results indicate that c-cut sapphire substrates induce highly (002) oriented growth of ZnCoO films. And all films show room temperature ferromagnetism. Moreover, the low substrate temperature can not only hinder the generation of the second Co₂O₃ phase, but also remarkably enhance the ferromagnetism of ZnCoO film compared with high substrate temperature. Optical spectrometry indicates that Co²⁺enters the tetrahedral sites of the wurtzite structure of ZnO host and substitutes for Zn²⁺.