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MA: Fachverband Magnetismus

MA 8: Spin Excitations and Spin Torque

MA 8.11: Vortrag

Montag, 11. März 2013, 12:15–12:30, H23

Current induced Domain Wall Motion in Rashba nanowires — •Martin Stier¹, Reinhold Egger², and Michael Thorwart¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg — ²Institut für theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf

We consider the current-induced motion of a Bloch domain wall in an thin ferromagnetic nanowire with strong Rashba spin-orbit coupling. By including intrinsic and extrinsic relaxation mechanisms, we calculate the full nonadiabatic spin torque. In particular, we show that a nonadiabatic local magnetic Rashba field H_R arises which can become large for small dampings β. Our theory predicts that with increasing spin-orbit coupling strength, domain wall motion progresses from purely translatory to oscillatory dynamics. For pulsed currents, depending on the pulse length, rich behavior is found, including wall motion against the current direction and a strong enhancement of the wall velocity.