Magneto-optical Kerr effect (MOKE) is an efficient approach to probe surface magnetization in thin film samples. Here we present a wide-field MOKE technique that adopts a Ko¨hler illumination scheme to characterize the current-induced damping-like spin-orbit torque (DL-SOT) in micronsized and unpatterned magnetic heterostructures with perpendicular magnetic anisotropy. Through a current-induced hysteresis loop shift analysis, we quantify the DL-SOT efficiency of a Ta-based heterostructure with bar-shaped geometry, Hall-cross geometry, and unpatterned geometry to be ∣ξDL∣≈ 0.08. The proposed wide-field MOKE approach therefore provides an instant and direct characterization of DL-SOT, without the need of any further interpretation on electrical signals.
@article{arxiv.1712.03810,
title = {Spin-orbit torque magnetometry by wide-field magneto-optical Kerr effect},
author = {Tsung-Yu Tsai and Tian-Yue Chen and Chun-Ting Wu and Hsin-I Chan and Chi-Feng Pai},
journal= {arXiv preprint arXiv:1712.03810},
year = {2018}
}