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Structural and Magnetic Properties of Codoped ZnO based Diluted Magnetic Semiconductors
作者姓名:李斌斌  沈鸿烈  张荣  修向前  谢治
作者单位:[1]College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 [2]Department of Physics, Nanjing University, Nanjing 210093 [3]National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029
基金项目:Supported by the Indraught Personnel Research Fund of Nanjing University of Aeronautics and Astronautics (S0733-061)
摘    要:Zn1-xCoxO (x = 0.01, 0.02, 0.05, 0.10 and 0.20) diluted magnetic semiconductors are prepared by the sol-gel method. The structural and magnetic properties of the samples are studied using x-ray diffraction (XRD), extended x-ray absorption fine structure (EXAFS) and superconducting quantum interference device (SQUID). The XRD patterns does not show any signal of precipitates that are different from wurtzite type ZnO when Co content is lower than x = 0.10. An EXAFS technique for the Co K-edge has been employed to probe the local structures around Co atoms doped in ZnO powders by fluorescence mode. The simulation results for the first shell EXAFS signals indicate that Zn sites can be substituted by Co atoms when Co content is lower than x = 0.05. The SQUID results show that the samples (x 〈 0.05) exhibit clear hysteresis loops at 300K, and magnetization versus temperature from 5 K to 350K at H = 100 Oe for the sample x = 0.02 shows that the samples have ferromagnetism above room temperature. A double-exchange mechanism is proposed to explain the ferromagnetic properties of the samples.

关 键 词:半导体  磁特性  结构  双掺杂
收稿时间:2007-06-12

Structural and Magnetic Properties of Codoped ZnO based Diluted Magnetic Semiconductors
LI Bin-Bin,SHEN Hong-Lie,ZHANG Rong,XIU Xiang-Qiang,XIE Zhi.Structural and Magnetic Properties of Codoped ZnO based Diluted Magnetic Semiconductors[J].Chinese Physics Letters,2007,24(12):3473-3476.
Authors:LI Bin-Bin  SHEN Hong-Lie  ZHANG Rong  XIU Xiang-Qiang  XIE Zhi
Institution:College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016Department of Physics, Nanjing University, Nanjing 210093National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029
Abstract:Zn1-xCoxO (x=0.01, 0.02, 0.05, 0.10 and 0.20) diluted magnetic semiconductors are prepared by the sol-gel method. The structural and magnetic properties of the samples are studied using x-ray diffraction (XRD), extended x-ray absorption fine structure (EXAFS) and superconducting quantum interference device (SQUID). The XRD patterns does not show anysignal of precipitates that are different from wurtzite type ZnO when Co content is lower than x=0.10. An EXAFS technique for the Co K-edge has been employed to probe the local structures around Co atoms doped in ZnO powders by fluorescence mode. The simulation results for the first shell EXAFS signals indicate that Zn sites can be substituted by Co atoms when Co content is lower than x=0.05. The SQUID results show that the samples (x<0.05) exhibit clear hysteresis loops at 300K, and magnetization versus temperature from 5K to 350K at H=100,Oe for the sample x=0.02 showsthat the samples have ferromagnetism above room temperature. A double-exchange mechanism is proposed to explain the ferromagnetic properties of the samples.
Keywords:61  10  -i  61  10  Ht  85  25  Dq
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