| Dependence of Effective Anisotropy on Grain Size in Nanocrystalline Nd2 Fe14 B Hard Magnetic Material |
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| 作者姓名： | 冯维存 高汝伟 韩广兵 朱明刚 李卫 孙光飞 |
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| 作者单位： | School of Physics and Microelectronics，Shandong University Jinan 250010，China，Division of (Functional) Materials，Central Iron and Steel Research Institute，Beijing 100081，China，School of Physics and Microelectronics，Shandong University Jinan 250010，China，School of Physics and Microelectronics，Shandong University Jinan 250010，China，Division of (Functional) Materials，Central Iron and Steel Research Institute，Beijing 100081，China，Division of (Functional) Materials，Central Iron and Steel Research Institute，Beijing 100081，China，School of Materials Science，University of Science and Technology Beijing，Beijing 100083，China |
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| 基金项目： | Project supported by National‘863’Project (2002AA324050，2002AA302602) and Natural Science Foundation of China(50371046) and Doctoral Foundation of China (20040422014) |
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| 摘 要： | Anisotropy of material is the key factor determin ing coercivity and anisotropy of nano grain is dramati cally influenced by grain size1~2]. So the coercivityof nano magnetic material with different grain sizeswould have obvious difference.…
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| 关 键 词： | 金属材料 有效各向异性 颗粒尺寸 交换-耦合反应 稀土元素 Nd2Fe14B 纳米晶体 |
Dependence of Effective Anisotropy on Grain Size in Nanocrystalline Nd2Fe14B Hard Magnetic Material |
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| FENG Weicun,GAO Ruwei,HAN Guangbing,Zhu Minggang,Li Wei,Sun Guangfei.Dependence of Effective Anisotropy on Grain Size in Nanocrystalline Nd2 Fe14 B Hard Magnetic Material[J].Journal of Rare Earths,2005,23(1):52-54. |
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| Authors: | FENG Weicun GAO Ruwei HAN Guangbing Zhu Minggang Li Wei Sun Guangfei |
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| Abstract: | Taking nanocrystalline Nd2Fe14B as a typical sample, based on Herzer′s random anisotropy theory and the cubic grain model, the partial exchange-coupling interaction model was established and the dependence of effective anisotropy constant Keff on grain size was investigated. Calculation results reveal that the exchange-coupling interaction enhances and the effective anisotropy of material Keff decreases with the reduction of grain size. The variation of Keff is basically the same as that of coercivity. The decrease of effective anisotropy is the main reason of the reduction of coercivity for nanocrystalline Nd2Fe14B permanent magnetic material. |
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| Keywords: | metal materials effective anisotropy grain size exchange-coupling interaction coercivity rare earths |
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