Figure 1
From: Spin-orbit torque magnetometry by wide-field magneto-optical Kerr effect
(a) Schematic illustration of the experimental setup for wide-field polar MOKE measurement with a Köhler illumination scheme. (b) Exemplary out-of-plane hysteresis loop from a Ta(4)/CoFeB(1.4)/Hf(0.5)/MgO(2) unpatterned film. I represents the mean intensity whereas ΔI is the difference between maximum and minimum MOKE responses. (c) Kerr rotation of Ta(4)/CoFeB(1.4)/Hf(0.5)/MgO(2) as a function of the angle between polarization directions of polarizer and analyzer. The solid line is the fit of data to \(2{K}_{r}\,\sin \,2\theta /({\cos }^{2}\theta +\gamma )\) with K r = 8 × 10−4 rad and γ = 4.2 × 10−3.
