Buchner M, Högl P, Putz S, Gmitra M, Günther S, Schoen M A W, Kronseder M, Schuh D, Bougeard D, Fabian J, Back C H
Institute of Experimental and Applied Physics, University of Regensburg, Regensburg 93040, Germany.
Institute of Theoretical Physics, University of Regensburg, Regensburg 93040, Germany.
Phys Rev Lett. 2016 Oct 7;117(15):157202. doi: 10.1103/PhysRevLett.117.157202. Epub 2016 Oct 6.
We report the observation of the anisotropic polar magneto-optical Kerr effect in thin layers of epitaxial Fe/GaAs(001) at room temperature. A clear twofold symmetry of the Kerr rotation angle depending on the orientation of the linear polarization of the probing laser beam with respect to the crystallographic directions of the sample is detected for ultrathin magnetic films saturated out of the film plane. The amplitude of the anisotropy decreases with increasing Fe film thickness, suggesting that the interfacial region is the origin of the anisotropy. The twofold symmetry is fully reproduced by model calculations based on an interference of interfacial Bychkov-Rashba and Dresselhaus spin-orbit coupling.
我们报告了在室温下外延Fe/GaAs(001)薄层中各向异性极化磁光克尔效应的观测结果。对于从薄膜平面外饱和的超薄磁性薄膜，检测到克尔旋转角具有明显的双重对称性，这取决于探测激光束的线偏振方向相对于样品晶体学方向的取向。各向异性的幅度随着Fe膜厚度的增加而减小，这表明界面区域是各向异性的起源。基于界面贝赫科夫 - 拉什巴和德雷塞尔豪斯自旋 - 轨道耦合的干涉进行的模型计算完全再现了这种双重对称性。
