铁需要从面心立方体奥氏体结构转变为体心立方体铁素体结构，但是铁素体只能容纳固溶体状态的0.02%的碳。

The iron wants to change from the FCC austenite structure to the BCC ferrite structure, but the ferrite can only contain 0.02% carbon in solid solution.

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使用变分累积展开法，计算了简单立方、体心立方、面心立方格点上自旋1/2的铁磁薄膜的磁化强度和矫玩力。

Using the variational cumulant expansion, the authors examine the magnetization and coercivity for spin-1/2 ferromagnetic films of simple cubic, body-centered-cubic and face-centered-cubic lattices.

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