中文摘要：

以α-Fe、Nd2Fe14B为例，研究了纳米晶粒尺寸对交换耦合的软-硬磁性晶粒各向异性的影响。结果表明，软-硬磁性晶粒的有效各向异性常数〈Ksh〉随软磁性晶粒尺寸Ds的增加而减小，随硬磁性晶粒尺寸Dh的增加而增大。当Ds／Dh为固定值且1／1．1≥Ds／Dh≥1／1．4时，〈Ksh〉在Ds为10～20nm之间取得一极大值。当Dh〉25nm，Ds在10nm左右时，可获得较大的〈Ksh〉。

英文摘要：

The grain size effects on the effective magnetic anisotropy constant 〈Ksh〉 between the exchange-coupled magnetically soft 〈α-Fe〉 and hard （Nd2Fe4B） nano-grains have been investigated. For the given size Dh of the hard grains, 〈Ksh〉 increases with the decreasing size D, of the soft grains. For the given Ds, 〈Ksh〉 increases with increasing Dh, and then approaches the magnetic anisotropy of the hard phase. For a given Ds/Dh ratio in the range of 1/1. 1≥D,/Dh≥1/1.4, 〈Ksh〉 versus D, has a maximum value. A large 〈Ksh〉 is predicted for the hard grain size larger than 25 nm and the soft grain size about 10nm.