Figure 5
From: Spin-orbit torque magnetometry by wide-field magneto-optical Kerr effect
(a) Schematics (top view) of tungsten probes configuration for measuring SOT effective field in a Ta(4)/CoFeB(1.4)/Hf(0.5)/MgO(2) unpatterned film. The two dashed boxes represent two different probing areas. w and L represent the width and the length of the probing area, respectively. D is the distance between two probe tips. Optically-detected hysteresis loops for I dc = ±8 mA and H x = 500 Oe from the probing area (b) away from the region with strong current flow and (c) within the strong current flow region. (d) \({H}_{z}^{{\rm{eff}}}\) of the unpatterned Ta-based heterostructure as functions of I dc for H x = ±500 Oe.
