Sustained chiral magnetic domain wall motion driven by spin-orbit torques under the tilted current
1 School of Physics and Electronics, Hunan University - Changsha 410082, China
2 Department of Applied Physics, Hebei University of Technology - Tianjin 300401, China
Received: 14 March 2016
Accepted: 22 June 2016
We theoretically investigate the steady magnetic domain wall driven by spin-orbit torques in the heavy-metal/magnet bilayers with perpendicular anisotropy. Based on collective coordinates method and stability analysis, we analyze the effects of tilted current and Dzyaloshinskii-Moriya interaction on the wall. We find that the wall acquires a sustained motion in the high-current regime by deviating the current from the wall track. Also, a persistent motion can be supported by the competition between spin-orbit torques and Dzyaloshinskii-Moriya interaction in transforming wall type. In the low-current regime, there exist a switching of wall chirality and a reversal of wall motion.
PACS: 75.60.Ch – Domain walls and domain structure / 75.70.Tj – Spin-orbit effects / 75.78.Fg – Dynamics of domain structures
© EPLA, 2016