MnBi磁性多层膜磁光科尔效应的数值模拟

基于各向异性的平面电磁波传输理论和4×4矩阵法，计算了MnBi，Mn_0.53Bi_0.47，Mn_0.52Bi_0.44Sb_0.04磁性多层膜系列的磁光科尔旋转角、椭圆率随波长、入射角、磁性层厚度变化曲线.计算结果表明，模拟的科尔旋转角、椭圆率随波长变化规律与实验结果吻合很好；在一定波长的垂直入射下，模拟的科尔旋转角、椭圆率随磁性层厚度变化曲线出现科尔谱极大；在磁性层厚度一定的情况下，当入射光以某一角度 关键词： 4×4矩阵法 磁性多层膜 磁光科尔谱 介电张量

Numerical calculation of Kerr spectra for MnBi magnetic multilayered films

Based on the theory of propagating electromagnetic plane waves in homogenous anisotropic media and 4×4 matrix method, the Kerr spectra for the MnBi multilayered films as a function of wavelength, incident angle and layer number are simulated. It is found that the calculated Kerr spectra as a function of wavelength are in good agreement with the experimental ones for MnBi,Mn_0.53Bi_0.47，Mn_0.52Bi_0.44Sb_0.04. In addition, the Kerr spectra as a function of incident angle and layer number for the MnBi multilayered films are simulated. The calculated results indicate that the magnetic layer number and incident angle greatly affect the Kerr spectra. A maximum Kerr rotation exists at some thickness of the magnetic film as the wavelength of the incident light is normal. Also, a maximum rotation is found in the simulated Kerr rotation as a function of incident angle at a fixed thickness of magnetic layer. These simulated results is important for the design of the materials.