| Defect-Bound Carrier Mediated Room-Temperature Ferromagnetism in Co-Doped ZnO Powders |
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| 作者姓名： | 文岐业 张怀武 宋远强 杨青慧 John．Xiao |
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| 作者单位： | [1]State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 [2]Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 90306015, the National Basic Research Programme of China under Grant No 2007CB31407 and the International S＆T Cooperation Programme of China under Grant No 2006DFA53410. |
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| 摘 要： | We prepare pure single-phase Co：ZnO powders introducing controllable interstitial Zni by Zn vapour annealing. The as-ground powder shows that no room-temperature ferromagnetism （RT-FM） exists, while the Zn vapour treated samples exhibit unambiguous RT-FM with a maximum magnetic moment of 0.2μB/Co. The FM of Co：ZnO strongly depends on the Zn diffusion process, suggesting that not only carriers but also Zni defects play an important role in mediating FM in diluted magnetic semiconductors. A new core-shell model is proposed to interpret the mixture behaviour of FM and paramagnetism observed in the Zn vapour annealed Co：ZnO powders.
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| 关 键 词： | 铁磁体 室温 钴 氧化锌 粉末 |
| 收稿时间： | 2007-6-15 |
| 修稿时间： | 2007-06-15 |
Defect-Bound Carrier Mediated Room-Temperature Ferromagnetism in Co-Doped ZnO Powders |
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| WEN Qi-Ye,ZHANG Huai-Wu,SONG Yuan-Qiang,YANG Qing-Hui John Q.Xiao.Defect-Bound Carrier Mediated Room-Temperature Ferromagnetism in Co-Doped ZnO Powders[J].Chinese Physics Letters,2007,24(10):2955-2958. |
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| Authors: | WEN Qi-Ye ZHANG Huai-Wu SONG Yuan-Qiang YANG Qing-Hui John QXiao |
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| Institution: | 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054; 2.Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | |
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| Keywords: | 75 50 Pp 81 40 Ef 61 72 Ww |
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