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We report on current-induced domain wall motion in Ta/C o 20 F e 60 B 20/MgO nanowires. Domain walls are observed to move against the electron flow when no magnetic field is applied, while a field along the nanowires strongly affects the domain wall motion velocity. A symmetric effect is observed for up-down and down-up domain walls. This indicates the presence of right-handed domain walls, due to a Dzyaloshinskii-Moriya interaction (DMI) with a DMI coefficient D=+ 0.06 mJ/m 2. The positive DMI coefficient is interpreted to be a consequence of B diffusion into the Ta buffer layer during annealing, which was observed by chemical depth profiling measurements. The experimental results are compared to one-dimensional model simulations including the effects of pinning. This modeling allows us to reproduce the experimental outcomes and reliably extract a spin-Hall angle θ SH=–0.11 for Ta in the nanowires …
American Physical Society
Publication date: 
28 Jan 2015

R Lo Conte, E Martinez, A Hrabec, A Lamperti, T Schulz, L Nasi, L Lazzarini, R Mantovan, F Maccherozzi, SS Dhesi, B Ocker, CH Marrows, TA Moore, M Kläui

Biblio References: 
Volume: 91 Issue: 1 Pages: 014433
Physical Review B