| Magnetoresistance and magnetic properties of Fe3O4 nanoparticle compacts |
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| 引用本文： | 王海,赵宏武,王常生,王荫君,詹文山,李凤英,靳常青,孟凡斌,李养贤. Magnetoresistance and magnetic properties of Fe3O4 nanoparticle compacts[J]. 中国物理, 2002, 11(2): 178-182 |
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| 作者姓名： | 王海 赵宏武 王常生 王荫君 詹文山 李凤英 靳常青 孟凡斌 李养贤 |
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| 作者单位： | State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China;Material Test Center, Hebei University of Technology, Tianjing 300130, China;Material Test Center, Hebei University of Technology, Tianjing 300130, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant Nos. 59928101 and 59871063). |
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| 摘 要： | In this paper,we report on the magnetic properties of Fe3O4 nanoparticles with different grain sizes under different pressures.In all the samples,the saturated magnetization Ms shows a linear decrease with increasing pressure.The thickness of the magnetic dead layer on the nanoparticle surface nuder different pressures was roughly estimated,which also increases with increasing pressure.The transport measurements of the nanoparticle Fe3O4 compacts show that the low-field magnetoresistance (MR) value is insensitive to the grain size in a wide temperature range;however,the high-field MR value is dependent on grain size,especially at low temperatures.These experimental results can be attributed to the different surface states of the nanoparticles.
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| 关 键 词： | Fe3O4 毫微粒子 饱和磁化 磁阻 |
| 收稿时间： | 2001-07-03 |
Magnetoresistance and magnetic properties of Fe3O4 nanoparticle compacts |
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| Wang Hai,Zhao Hong-Wu,Wang Chang-Sheng,Wang Yin-Jun,Zhan Wen-Shan,Li Feng-Ying,Jin Chang-Qing,Meng Fan-Bin and Li Yang-Xian. Magnetoresistance and magnetic properties of Fe3O4 nanoparticle compacts[J]. Chinese Physics, 2002, 11(2): 178-182 |
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| Authors: | Wang Hai Zhao Hong-Wu Wang Chang-Sheng Wang Yin-Jun Zhan Wen-Shan Li Feng-Ying Jin Chang-Qing Meng Fan-Bin Li Yang-Xian |
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| Affiliation: | Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; Material Test Center, Hebei University of Technology, Tianjing 300130, China; State Key Laboratory of Magnetism, Institute of Physics and Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | In this paper, we report on the magnetic properties of Fe3O4 nanoparticles with different grain sizes under different pressures. In all the samples, the saturated magnetization Ms shows a linear decrease with increasing pressure. The thickness of the magnetic dead layer on the nanoparticle surface under different pressures was roughly estimated, which also increases with increasing pressure. The transport measurements of the nanoparticle Fe3O4 compacts show that the low-field magnetoresistance (MR) value is insensitive to the grain size in a wide temperature range; however, the high-field MR value is dependent on grain size, especially at low temperatures. These experimental results can be attributed to the different surface states of the nanoparticles. |
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| Keywords: | nanoparticle saturated magnetization magnetoresistance |
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