中文摘要：

研究纳米磁性材料晶粒间的交换耦合相互作用,提出适合各种耦合条件晶粒界面及表面处各向异性的表达式.结果表明：软、硬磁性相晶粒间的交换耦合相互作用降低了硬磁性相晶粒的各向异性,提高了软磁性相晶粒的各向异性.软硬磁性晶粒的平均各向异性先增加后减小,在某个晶粒尺寸值达到最大值,这种变化趋势与相关的理论及实验结果一致.硬硬磁性晶粒的平均各向异性随晶粒尺寸的变化趋势与相关的实验结果也一致.

英文摘要：

Exchange-coupling effect in anisotropy constant of nano-meter magnetic materials is investigated. An equation was put forward for anisotropy at grain boundaries. Due to exchange-coupling between magnetically soft and hard grains, anisotropy of hard grain is decreased while that of soft grain is enhanced. The average anisotropy of soft-hard grains, increases rapidly,reaches a maximum and then decreases slowly. It is consistent with related experimental and theoretic results. Calculated average anisotropy of hard grains is consistent with experiment.