Figure 2
From: Spin-orbit torque magnetometry by wide-field magneto-optical Kerr effect
(a) Schematics of wide-field polar MOKE signal detection for a micron-sized bar-shaped sample under current-induced hysteresis loop shift measurements. (b) A representative image of the measured bar-shaped device (10 μm × 20 μm) and the probing area under optical microscope. (c) Optically-detected hysteresis loops of a Ta(4)/CoFeB(1.4)/Hf(0.5)/MgO(2) sample with dc currents (I dc ) of opposite polarities and under the application of an in-plane bias field H x = 600 Oe to overcome Dzyaloshinskii-Moriya interaction. \({H}_{z}^{{\rm{eff}}}\)’s represent the amount of shifts in terms of effective field due to current-induced SOT. (d) \({H}_{z}^{{\rm{eff}}}\) as functions of I dc for H x = ±600 Oe.
