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〉.
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