Rotatable spin-polarized electron source for inverse-photoemission experiments.
Rotatable spin-polarized electron source for inverse-photoemission experiments.
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DOI：
10.1063/1.4863097
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发表时间：
2014-01
期刊：
影响因子：
--
通讯作者：
S. D. Stolwijk;H. Wortelen;A. Schmidt;M. Donath
中科院分区：
文献类型：
--
作者：
S. D. Stolwijk;H. Wortelen;A. Schmidt;M. Donath
我们提出了一种可旋转的自旋极化电子源（ROSE），用于自旋和角度分辨反光电发射（SR-IPE）实验。ROSE的一个关键特征是横向电子束的偏振方向是可变的。因此，反光电发射实验对两个正交的面内偏振方向敏感，而对于非正态电子入射，则对面外偏振分量敏感。在SR-IPE实验的基础上，对ROSE进行了表征和性能测试。在W（110）上磁化Ni薄膜的测量可以作为证明可变自旋灵敏度的参考。此外，对Tl/Si（111）的未占据自旋依赖表面电子结构的研究突出了分析动量空间中自旋等复杂现象的能力。从本质上讲，ROSE为进一步研究表面磁场和表面自旋轨道相互作用中的复杂自旋依赖效应开辟了道路。
We present a ROtatable Spin-polarized Electron source (ROSE) for the use in spin- and angle-resolved inverse-photoemission (SR-IPE) experiments. A key feature of the ROSE is a variable direction of the transversal electron beam polarization. As a result, the inverse-photoemission experiment becomes sensitive to two orthogonal in-plane polarization directions, and, for nonnormal electron incidence, to the out-of-plane polarization component. We characterize the ROSE and test its performance on the basis of SR-IPE experiments. Measurements on magnetized Ni films on W(110) serve as a reference to demonstrate the variable spin sensitivity. Moreover, investigations of the unoccupied spin-dependent surface electronic structure of Tl/Si(111) highlight the capability to analyze complex phenomena like spin rotations in momentum space. Essentially, the ROSE opens the way to further studies on complex spin-dependent effects in the field of surface magnetism and spin-orbit interaction at surfaces.