We demonstrate simultaneous detection of current driven antidamping-like and field-like spin-orbit torques in heavy metal/ferromagnetic metal bilayers by measuring all three magnetization components m_(x,) m_y, and m_z using the vector magneto-optic Kerr effect. We have also implemented a self-calibration method to accurately determine the effective fields of spin-orbit torques. With this technique, we investigate the magnitude and direction of spin-orbit torques in a series of platinum/permalloy samples. The values found are in excellent agreement with results obtained via quadratic magneto-optic Kerr effect, planar Hall effect, and spin transfer ferromagnetic resonance measurements.
@article{arxiv.1707.08565,
title = {3D MOKE spin-orbit torque magnetometer},
author = {Halise Celik and Harsha Kannan and Tao Wang and Alex R. Mellnik and Xin Fan and Xinran Zhou and Daniel C. Ralph and Matthew F. Doty and Virginia O. Lorenz and John Q. Xiao},
journal= {arXiv preprint arXiv:1707.08565},
year = {2017}
}