| Variations from Zn1-xCoxO Magnetic Semiconductor to Co-ZnCoO Granular Composite |
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| 作者姓名： | 陈延学 颜世申 刘国磊 梅良模 任妙娟 |
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| 作者单位： | [1]School of Physics and Microelectronics and National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 [2]School of Science, Jinan University, Jinan 250022 |
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| 基金项目： | Supported by the National Basic Research Programme of China under Grant No 2001CB610603, the National Natural Science Foundation of China under Grant Nos 50402019 10234010 and 50572053, NCET040634 and the Doctoral Fund of Jinan University （B0404）. |
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| 摘 要： | We investigate the variations from as-deposited Zn1-x： Cox O magnetic semiconductors to the post-annealed Co- ZnCoO granular composite. The as-deposited Zn1-x Cox 0 magnetic semiconductor deposited under thermal nonequilibrium conditions is composed of Zn1-x. Cox O nanograins of high Co concentration. The room-temperature ferromagnetism with high magnetization and large negative magnetoresistance are found in the as-deposited samples. By annealing, the samples become of granular composite consisting of the Co metal grains and the remanent Zn1-x CoxO matrix. Although the magnetization is enhanced after annealing, the spin-dependent negative magnetoresistance disappears at room temperature. The magnetoresistance observed in the annealed samples in the high field region has no relation with the ferromagnetism, which in turn indicates that the roomtemperature ferromagnetism and large negative magnetoresistance observed in the as-deposited are the intrinsic properties of the Zn1-x Cox O magnetic semiconductor.
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| 关 键 词： | Zn1-xCoxO 半导体 磁性 Co-ZnCoO颗粒 |
| 修稿时间： | 2006-06-19 |
Variations from Zn1-xCoxO Magnetic Semiconductor to Co--ZnCoO Granular Composite |
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| CHEN Yan-Xue,YAN Shi-Shen,LIU Guo-Lei,MEI Liang-Mo,REN Miao-Juan.Variations from Zn1-xCoxO Magnetic Semiconductor to Co-ZnCoO Granular Composite[J].Chinese Physics Letters,2007,24(1):214-217. |
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| Authors: | CHEN Yan-Xue YAN Shi-Shen LIU Guo-Lei MEI Liang-Mo REN Miao-Juan |
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| Institution: | School of Physics and Microelectronics and National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100
School of Science, Jinan University, Jinan 250022 |
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| Abstract: | We investigate the variations from as-deposited Zn1-xCoxO magnetic semiconductors to the post-annealed Co--ZnCoO granular composite. The as-deposited Zn1-xCoxO magnetic semiconductor deposited under thermal non-equilibrium conditions is composed of Zn1-xCoxO nanograins of high Co concentration. The room-temperature ferromagnetism with high magnetization and large negative magnetoresistance are found in the as-deposited samples. By annealing, the samples become of granular composite consisting of the Co metal grains and the remanent Zn1-xCoxO matrix. Although the magnetization is enhanced after annealing, the spin-dependent negative magnetoresistance disappears at room temperature. The magnetoresistance observed in the annealed samples in the high field region has no relation with the ferromagnetism, which in turn indicates that the room-temperature ferromagnetism and large negative magnetoresistance observed in the as-deposited are the intrinsic properties of the Zn1-xCoxO magnetic semiconductor. |
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| Keywords: | 75 50 Pp 75 47 -m |
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