Spin-orbit torque-driven current-induced domain wall motion in Gd-Fe magnetic wires

摘要

We fabricated Gd-Fe/Ta/sub, and W/Gd-Fe/Ta/sub, perpendicular magnetized magnetic wires and investigated current-induced domain wall motion (CIDWM) in them. The propagation field of the Gd-Fe wires is low (similar to 3 mT), and the wires were found to have a low threshold current density (similar to 3.1 x 10(10) A m(-2)) of CIDWM. The directions of the CIDWM in Gd-Fe/Ta and W/Gd-Fe/Ta wires are opposite to each other, indicating that the CIDWM in both wires is driven by spin-orbit torque because the spin Hall torque generated by the Ta underlayer and W cap layer oppose each other. (C) 2019 The Japan Society of Applied Physics