| Electrical Properties of Nanostructured Magnetic Colloid and Influence of Magnetic Field |
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| 作者姓名： | 卜胜利 陈险峰 狄子昀 耿滔 夏宇兴 |
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| 作者单位： | [1]College of Science, University of Shanghai for Science and Technology, Shanghai 200093 [2]Department of Physics, The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240 |
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| 摘 要： | We investigate the electrical properties of the nanostructured magnetic colloid without and with magnetic field. The competition between the directional motion of the charged magnetic nanoparticles and other minor nonmagnetic impurities （also small amount of ions） under applied voltage and their random orientation due to thermal activation is implemented to elaborate the electrically conduction mechanism under zero magnetic field. Two equivalent electric circuits are employed for explaining the charging and discharging processes. The tunnelling conduction mechanism upon application of externally magnetic field may exist in the nanostructured magnetic colloid. The alternation of the two conduction mechanisms accounts for the current spikes when the magnetic field is switched on or off. This work presents the peculiar electrical phenomena of the magnetically colloidal system.
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| 关 键 词： | 磁性胶体 电磁学 磁学 物理分析 |
| 收稿时间： | 2007-08-13 |
Electrical Properties of Nanostructured Magnetic Colloid and Influence of Magnetic Field |
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| PU Sheng-Li,CHEN Xian-Feng,DI Zi-Yun,GENG Tao,XIA Yu-Xing.Electrical Properties of Nanostructured Magnetic Colloid and Influence of Magnetic Field[J].Chinese Physics Letters,2007,24(11):3253-3256. |
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| Authors: | PU Sheng-Li CHEN Xian-Feng DI Zi-Yun GENG Tao XIA Yu-Xing |
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| Institution: | College of Science, University of Shanghai for Science and Technology, Shanghai 200093Department of Physics, The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240 |
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| Abstract: | We investigate the electrical properties of the nanostructured magnetic colloid without and with magnetic field. The competition between the directional motion of the charged magnetic nanoparticles and other minor nonmagnetic impurities (also small amount of ions) under applied voltage and their random orientation due to thermal activation is implemented to elaborate the electrically conduction mechanism under zero magnetic field. Two equivalent electric circuits are employed for explaining the charging and discharging processes. The tunnelling conduction mechanism upon application of externally magnetic field may exist in the nanostructured magnetic colloid. The alternation of the two conduction mechanisms accounts for the current spikes when the magnetic field is switched on or off. This work presents the peculiar electrical phenomena of the magnetically colloidal system. |
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| Keywords: | 75 50 Mm 75 75 +a 82 70 Dd |
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