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用两个自旋相互垂直的s=1的层状伊辛模型描述磁性薄膜极化转向的物理过程 .计算了自由能密度随原子层的增加所发生的变化 ,得到了与实验定性相同的极化方向转变的规律 .结果显示 :在层数增加过程中 ,偶极作用的影响基本保持不变 ,发生极化转向的主要原因是表面垂直各向异性能的影响随层数增加被逐渐削弱 ,最终弱于偶极作用的影响而导致极化方向从垂直转到平行膜面 .
The physical process of the polarization of the magnetic thin film is described by using two layered Ising models with s = 1 perpendicular to each spin. The change of the free energy density with the increase of the atomic layer is calculated, and the same pole The results show that the influence of dipole action remains unchanged in the process of increasing the number of layers, and the main reason for polarization steering is that the influence of surface vertical anisotropy energy is gradually weakened with the increase of number of layers, The final weaker than the dipole effect of the polarization resulting from the vertical direction to parallel to the membrane surface.