借助层状模型,研究了硬磁相与软磁相原子的短程交换作用对界面原子磁矩取向的影响.结果表明,短程交换作用使得界面附近硬磁相和软磁相各自几个变换作用长度范围内,原子磁矩以特定的方式取向排列.这种特定的取向排列可称为界面磁各向异性.界面磁各向异性依赖于硬磁相易磁化方向的相对取向和软磁相的厚度,其包含的能量随软磁相厚度的减小有一极大值.在晶粒尺寸为几十个纳米的复相纳米永磁中,界面磁各向异性显著依赖于软磁相晶粒尺寸,而对硬磁相晶粒尺寸不敏感,其包含的能量极大值与最佳微结构相关.
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