| 纳米硬磁相耦合永磁体的有效各向异性与矫顽力 |
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| 引用本文： | 谢超然.纳米硬磁相耦合永磁体的有效各向异性与矫顽力[J].北京化工大学学报(自然科学版),2005,32(4):70-72. |
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| 作者姓名： | 谢超然 |
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| 作者单位： | 北京化工大学理学院，北京 100029 |
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| 摘 要： | 通过建立球状晶粒模型，研究了纳米硬磁相晶粒之间的交换耦合相互作用对晶粒有效各向异性和矫顽力的影响，结果表明随着晶粒直径的减小，晶粒之间的交换耦合相互作用将随之增强，而材料的有效各向异性和矫顽力将逐渐下降。为了保证材料具有较高的各向异性和矫顽力，晶粒的直径应该大于20nm。同时，通过与实验数据的拟合，得到了矫顽力的最佳计算公式(Hc=0.32×2Keff/Js)。
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| 关 键 词： | 纳米硬磁相耦合永磁体 交换耦合相互作用 有效各向异性 矫顽力 纳米硬磁相耦合永磁体 交换耦合相互作用 有效各向异性 矫顽力 |
| 收稿时间： | 2004-11-22 |
| 修稿时间： | 2004-11-22 |
Effective anisotropy constant and coercivity of nanocrystalline ferromagnets |
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| XIE Chao-ran.Effective anisotropy constant and coercivity of nanocrystalline ferromagnets[J].Journal of Beijing University of Chemical Technology,2005,32(4):70-72. |
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| Authors: | XIE Chao-ran |
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| Institution: | College of Science, Beijing University of Chemical Technology，Beijing 100029, China |
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| Abstract: | Effects of the exchange coupling interaction between the grains on the effective anisotropy and the coercive field in nano composite permanent magnets were investigated by establishing a model of globosity. The calculation shows that due to the exchange-coupling interaction, the effective anisotropy and the coercive field decrease with the decrease in the grain sizes. For the sake of the enhancing the effective anisotropy and the coercive field, the grain size must be bigger than 20nm. Simultaneously, the best formula of the coercive force, Hc=0.32×2Keff/Js, was found by correlation of the xperimental data. |
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| Keywords: | nanocrystalline ferromagnets exchange-coupling interaction effective anisotropy coercivity |
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