Fig. 5
MOKE images of SOT-driven magnetization switching in Bi2Se3/Py at zero magnetic field and room temperature. a–e, MOKE images for SOT-driven magnetization switching by applying a pulsed dc current I along the +x-axis with increasing the current density J C in the Bi2Se3 layer denoted underneath the corresponding image. The blue dashed rectangle in a represents the 12-μm wide Bi2Se3/Py channel connected with two big contact pads. The yellow dashed boxes in a denote five small Py rectangles magnetically isolated by Cu bars. f–j, MOKE images for SOT-driven magnetization switching for I along –x-axis. The dark (light) contrast shows the magnetization along +y (−y)-axis. The direction of magnetization is also indicated by the white arrows in a, e, f, j. The white scale bar is 20 μm
