Spin Polarisation in Heusler alloy based spintronics systems probed by SPINHAXPES

基于一步模型的光发射自旋分辨硬X射线光发射（SPINHAXPES）的描述将开发，同样占相对论和相关效应，以及相对于原子和自旋配置的无序。特别是，它将适当地处理由于驻波技术和高光子能量的使用而产生的特定特征。这些发展将用于基于半金属Heusler合金的GMR和TMR设备的详细调查。重点将放在费米能在接口的自旋极化，因为它是至关重要的自旋相关的运输。将详细考虑各种畸变因素的影响，如结构缺陷或热波动。特别强调将放在有限温度下的自旋极化的研究。为此，将采用各种补充方法，包括将Monte Carlo模拟结果反馈到电子结构计算中。计划中的研究将清楚地表明SPINHAXPES作为掩埋界面自旋极化的新探针的潜力，同时将直接支持合作者Inomata，Felser等人的补充实验工作。

Based on the one-step model of photo emission a description of spin-resolved hard X-ray photo emission (SPINHAXPES) will be developed that equally accounts for relativistic and correlation effects as well as disorder with respect to atomic and spin configurations. In particular, it will properly deal with specific features due to the use of the standing wave technique and high photon energy. The developments will be exploited for a detailed investigation on GMR- and TMR-devices based on half-metallic Heusler alloys. The focus will be put on the spin-polarisation at the Fermi-energy at interfaces because it is of central importance for spin-dependent transport. The influence of various distorting factors as structural imperfections or thermal fluctuations will be considered in a detailed way. Special emphasis will be put on a study on the spin polarisation at finite temperatures. For this, a variety of complementary approaches will be applied including a feed-back of the results of Monte Carlo simulations into electronic structure calculations. The planned investigations will clearly demonstrate the potential of SPINHAXPES as a new probe for the spin polarisation of buried interfaces and will at the same time directly support the complementary experimental work of the collaborators Inomata, Felser et al.