磁性材料中的晶粒相互作用

Intergrain Interactions in the Magnetic Materials

磁性材料中的晶粒相互作用对材料的宏观磁性有决定性影响。相互作用可分为晶粒之间的长程静磁相互作用和近邻晶粒之间的交换耦合相互作用。晶粒相互作用强弱取决于材料的微结构（晶粒形状、尺寸、取向及界面耦合程度）。可以从理论模型计算和实验曲线分析两种方法研究、比较两种晶粒相互作用。最后介绍了纳米软磁材料和纳米双相永磁材料中的交换相互作用对材料性能的影响。

The intergrain interactions have the decisive effects on the macroscopic properties of the magnetic materials.The interactions can be classified as the longrange magnetostatic interaction between the grains and the exchange coupling interaction of the neighboring grains. The strengths of the interactions are depended on the microstructure of the materials( the forms, the dimensions, the alignment and the interface coupling degrees of the grains). The intergrain interactions can be studied and compared by the theoretical model calculation and by analyzing the experimental curves. In the end of this paper, we introduce the effects of the exchange coupling interaction on the properties for the nanometer soft magnetic materials and the nanometer twophase permanent materials.