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Interfacial current-induced torques in Pt/Co/GdOx

Current-driven domain wall (DW) motion is investigated in Pt/Co/GdOx nanostrips with perpendicular magnetic anisotropy. Measurements of the propagation field and the energy barrier for thermally activated DW motion reveal a large current-induced torque equivalent to an out-of-plane magnetic field of ~60 Oe per 10^11 A/m^2. This same field-to-current scaling is shown to hold in both the slow thermally activated and fast near-flow regimes of DW motion. The current-induced torque decreases with 4 Å of Pt decorating the Co/GdOx interface and vanishes entirely with Pt replacing GdOx, suggesting that the Co/GdOx interface contributes directly to highly efficient current-driven DW motion.

preprint2012arXivOpen access
Satoru EmoriDavid C. BonoGeoffrey S. D. Beach
cond-mat.mtrl-sci
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Satoru EmoriDavid C. BonoGeoffrey S. D. Beach

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