铬中轨道霍尔效应的磁光检测

Magneto-Optical Detection of the Orbital Hall Effect in Chromium.

作者信息

Lyalin Igor, Alikhah Sanaz, Berritta Marco, Oppeneer Peter M, Kawakami Roland K

机构信息

Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120 Uppsala, Sweden.

出版信息

Phys Rev Lett. 2023 Oct 13;131(15):156702. doi: 10.1103/PhysRevLett.131.156702.

DOI:10.1103/PhysRevLett.131.156702

PMID:37897779

Abstract

The orbital Hall effect has been theoretically predicted but its direct observation is a challenge. Here, we report the magneto-optical detection of current-induced orbital accumulation at the surface of a light 3d transition metal, Cr. The orbital polarization is in-plane, transverse to the current direction, and scales linearly with current density, consistent with the orbital Hall effect. Comparing the thickness-dependent magneto-optical measurements with ab initio calculations, we estimate an orbital diffusion length in Cr of 6.6±0.6 nm.

摘要

轨道霍尔效应已在理论上得到预测，但其直接观测颇具挑战。在此，我们报告了对轻3d过渡金属Cr表面电流诱导的轨道积累的磁光检测。轨道极化在平面内，垂直于电流方向，且与电流密度呈线性比例关系，这与轨道霍尔效应相符。通过将厚度依赖的磁光测量结果与从头计算进行比较，我们估计Cr中的轨道扩散长度为6.6±0.6纳米。