MnBi磁性多层膜磁光科尔效应的数值模拟  

Numerical calculation of Kerr spectra for MnBi magnetic multilayered films

作　　者：林应斌[1] 赖恒[1] 黄志高[1,2] 都有为[2] 

机构地区：[1]福建师范大学物理系,激光所,福州350007 [2]南京大学固体微结构国家重点实验室,南京210093

出　　处：《物理学报》2004年第2期606-613,共8页Acta Physica Sinica

基　　金：教育部高等学校骨干教师资助计划;福建省自然科学基金;创新人才基金 (批准号 :E0 0 10 0 2 2 ;2 0 0 0E14 6和K3 0 70 );国家 973项目 (批准号 :19990 64 5 0 8)资助的课题~~

摘　　要：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,Mn0 53Bi0 4 7,Mn0 52 Bi0 4 4Sb0 0 4 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入射时 ,模拟的科尔旋转角、椭圆率随入射角变化曲线呈现极大峰 .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.

关 键 词：磁性多层膜 磁光科尔谱 介电张量 各向异性 平面电磁波传输 锰铋 科尔旋转角 磁光记录材料 

分 类 号：O482[理学—固体物理]