Theory of induced magnetic moments and x-ray magnetic circular dichroism in Co-Pt multilayers
Theory of induced magnetic moments and x-ray magnetic circular dichroism in Co-Pt multilayers
复制标题
Co-Pt 多层膜中的感应磁矩和 X 射线磁圆二色性理论
DOI：
10.1103/physrevb.66.094413
复制
发表时间：
2002
影响因子：
3.7
通讯作者：
G. Schütz
中科院分区：
文献类型：
--
作者：
C. Ederer;M. Komelj;M. Fähnle;G. Schütz
通过将铂层划分为0.1 nm厚的薄片，并为每块薄片分配一个磁光学常数的磁性修正帕拉特形式化建模，得到了共振反射率中测量的不对称比。模型中的自由参数是由于每片片的感应磁化引起的这一常数的变化。本文用从头算密度泛函电子理论计算了各种comp - ptn多层膜的Pt层中诱导轨道矩和自旋矩的分布，其中m和n分别表示Co和Pt层中Co单层和Pt单层的数量。本研究有两个目的。首先，对理想值进行了计算。原子平！Co-Pt接口。从理论结果与实验数据的比较中，人们可以了解所考虑的实验中实际界面的样子。其次，我们想考虑一些关于多层XMCD光谱分析的一般关键问题。分析总是基于和规则，这些规则不是严格有效的，而是依赖于一些近似。10通过比较直接计算mo
the measured asymmetry ratio in the resonant reflectivity and from modeling with a magnetically modified Parratt formalism that divides the Pt layer into 0.1-nm-thick sheets and assigns a magnetic optical constant to each sheet. The free parameter in the modeling is the change in this constant of each sheet due to the induced magnetization in this sheet. In the present paper we calculate by the ab initio densityfunctional electron theory the profiles of the induced orbital moments and spin moments in the Pt layers of various Com-Ptn multilayers, where m and n denote the numbers of Co monolayers and Pt monolayers in the Co and Pt layers, respectively. There are two objectives of the present study. First, the calculations are performed for ideal ~i.e., atomically flat ! Co-Pt interfaces. From a comparison of the theoretical results with the experimental data one may get an idea of how the real interfaces in the considered experiments looked like. Second, we want to consider some general critical issues concerning the analysis of XMCD spectra in multilayers. The analysis is always based on the sum rules which are not strictly valid but which rely on some approximations. 10 By comparing the directly calculated mo