Optical and magnetooptical properties of granular alloys with giant magnetoresistance in the IR region of the spectrum
Optical and magnetooptical properties of granular alloys with giant magnetoresistance in the IR region of the spectrum
复制标题
红外光谱区具有巨磁阻的粒状合金的光学和磁光性质
DOI：
10.1134/1.558937
复制
发表时间：
1999
影响因子：
1.1
通讯作者：
J. Clerc
中科院分区：
文献类型：
--
作者：
A. Granovskiǐ;M. Kuz’michev;J. Clerc
利用磁折变效应和赤道克尔效应，研究了巨磁阻颗粒合金在红外区的光学和磁光学特性。计算是在半经典近似下进行的，考虑了颗粒体及其表面（界面）上的自旋相关散射。得到的σxx（ω）和σxy（ω）的表达式对颗粒表面和颗粒体的散射、颗粒尺寸、界面杂质类型、入射光频率和外加磁场都很敏感。对于具有巨磁阻的颗粒状薄膜，该理论预测了当样品磁化至饱和时（对于20%量级的巨磁阻，分别为0.02%和20%）光学反射和透射系数的显著相对变化，以及与磁化有关的非线性Kerr和Faraday效应。
The features of the optical and magnetooptical properties of granular alloys with giant magnetoresistance in the IR region are examined in reference to the magnetorefractive effect and the equatorial Kerr effect. Calculations are performed within the semiclassical approximation with consideration of spin-dependent scattering in the bulk of the granules and on their surfaces (interfaces). The expressions obtained forσxx(ω) andσxy(ω) are found to be sensitive to scattering on the surfaces and in the bulk of the granules, as well as to granule size, the type of impurities trapped on the interfaces, the frequency of the incident light, and the external magnetic field. For granular thin films exhibiting giant magnetoresistance, the theory predicts significant relative changes in the optical reflection and transmission coefficients when the sample is magnetized to saturation (0.02% and 20%, respectively, for giant magnetoresistance of the order of 20%), as well as Kerr and Faraday effects that are nonlinear with respect to magnetization.