晶粒间界相对纳米Nd_2Fe_(14)B各向异性和矫顽力的影响

Effect of intergranular phase on the anisotropy and coercivity of nanometer Nd_2Fe_(14)B materials

本文采用立方晶粒结构模型研究了晶粒间界相对纳米硬磁材料各向异性和矫顽力的影响.结果表明:晶粒间界相减弱了交换耦合作用.当晶粒尺寸D为定值时,随着晶粒间界相厚度d的增加,晶粒平均各向异性<K>单调增加,而材料的有效各向异性Keff、矫顽力单调减小.我们计算的矫顽力随晶粒尺寸的变化与相关理论和实验结果基本一致.

The effect of intergranular phase on the anisotropy and coercivity of nanometer hard mangnetic material has been investigated by adopting cubic model of grain. The results show that the exchange-coupling interaction between grains is weakened by intergranular phase. When grain size D is fixed, with increasing the thickness of grain size d, the average anisotropy of grain 〈 K 〉 increases monotonously, however, the effective anisotropy Keff and eoercivity of material decrease monotonously. The variation of coercivity with grain size we calculated are basically similar with that of theretical and experimental results.