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本文计算了三方结构不同表面和不同磁化强度取向下的 χ( 2 ) 、SHG、MSHG及非线性克尔旋转角 Φ( 2 )k,a.结果表明 ,SHG和 Φ( 2 )k,a值非常灵敏地依赖于薄膜的表面及磁化强度的取向 ;三方结构的 SHG、Φ( 2 )k,a与 fcc、bcc和 hcp结构的相比有很大的差异 ,这表明结构对非线性磁光效应有重要的影响 ;当 M∥X、Y轴时 ,MSHG信号很明显 ,这表明可通过 A值的测量来研究磁性薄膜表面的磁畴结构以及取向 .
In this paper, χ (2), SHG, MSHG and nonlinear Kerr rotation angle Φ (2) k, a under different surface orientations and different magnetization orientations are calculated. The results show that the values of SHG and Φ Very sensitive to the orientation of the surface and the magnetization of the film. The tripartite structure of SHG, Φ (2) k, a and fcc, bcc and hcp structures are very different, which shows that the structure of the nonlinear magneto-optical The effect of MSHG signal is obvious when M∥X and Y axis, which indicates that the magnetic domain structure and orientation on magnetic thin film surface can be studied by the measurement of A value.