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利用微磁学理论和变分原理，计算了纳米双相交换耦合多层膜α-Fe／Nd2Fe14B永磁体的成核场随两相磁层厚度的变化曲线。计算结果表明，当软磁相或硬磁相的厚度为某一临界值时，该交换耦合多层永磁膜的成核场达到其最大值，这与Rave等人的有限元法计算结果趋势是一致的，考虑到工艺参数的影响后，也与Shindo等人的实验及理论估算结果是一致的．
Using the theory of micro-magnetism and variational principle, the variation of the nucleation field with the two-phase magnetic layer thickness of the nanocrystalline BIPD α-Fe / Nd2Fe14B permanent magnet was calculated. The calculated results show that when the thickness of the soft magnetic or hard magnetic phase is a certain critical value, the nucleation field of the exchange-coupled multilayer permanent magnetic film reaches its maximum, which is in agreement with the trend of the finite element method calculation result by Rave et al. Is consistent, taking into account the impact of process parameters, but also with Shindo et al experimental and theoretical estimates are consistent.