Domain-wall resonance induced by spin-polarized current in metal thin films with stripe structures

Abstract

The dynamics of a domain wall induced by spin-polarized current is studied in ferromagnetic metallic thin films with stripe structures. The solution of the generalized Landau-Lifshitz-Gilbert equation including adiabatic and nonadiabatic spin torque is used to describe motion and distortion of the domain wall. We show that ac currents facilitate the manipulation of the domain wall since domain wall resonance decreases the critical current density for depinning. In contrast with dc current, both the two spin torques induced by ac currents can produce wall motion and distortion.