Domain-wall depinning assisted by pure spin currents

Abstract

We study the depinning of domain walls by pure diffusive spin currents in a nonlocal spin valve structure based on two ferromagnetic permalloy elements with copper as the nonmagnetic spin conduit. The injected spin current is absorbed by the second permalloy structure with a domain wall and from the dependence of the wall depinning field on the spin current density we find an efficiency of 6*10^{-14}T/(A/m^2), which is more than an order of magnitude larger than for conventional current induced domain wall motion. Theoretically we reproduce this high efficiency, which arises from the surface torques exerted by the absorbed spin current that lead to efficient depinning.

11 pages, 3 figures, accepted for publication in Phys. Rev. Lett

References in corpus (8)

• Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Real-space observation of current-driven domain wall motion in submicron magnetic wires
• Spin Injection and Detection in Magnetic Nanostructures
• Microscopic approach to current-driven domain wall dynamics
• Spin injection and spin accumulation in all-metal mesoscopic spin valves
• Non-adiabatic spin torque investigated using thermally activated magnetic domain wall dynamics
• Control of spin injection by direct current in lateral spin valves

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