Signature of intrinsic high-temperature ferromagnetism in cobalt-doped zinc oxide nanocrystals

被引:182
作者
Wang, Xuefeng
Xu, Jianbin [1 ]
Zhang, Bei
Yu, Huogen
Wang, Juan
Zhang, Xixiang
Yu, Jiaguo
Li, Quan
机构
[1] Chinese Univ Hong Kong, Dept Elect Engn, Mat Sci & Technol Res Ctr, Shatin, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Dept Elect Engn, Mat Sci & Technol Res Ctr, Shatin, Hong Kong, Peoples R China
[3] Hong Kong Univ Sci & Technol, Inst Nano Sci & Technol, Kowloon, Hong Kong, Peoples R China
[4] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
[5] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[6] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
关键词
D O I
10.1002/adma.200600396
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nanocrystalline Zn1-xCoxO (x = 0.020, 0.056, and 0.098) powders exhibit intrinsic high-temperature ferromagnetism, as suggested by the well-defined hysteresis loops shown in the figure. The origin of this ferromagnetism is thought to be electron transfer from host Zn 4s states to unfilled dopant Co 3d states (shown in the inset to the figure), which leads to the formation of a spin-split impurity band at the Fermi level in the gap.
引用
收藏
页码:2476 / +
页数:6
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