AVS 52nd International Symposium
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuA

Invited Paper MI-TuA3
Current-Driven Magnetization Dynamics: Domain Wall Motion and Thermal Effects

Tuesday, November 1, 2005, 2:40 pm, Room 204

Session: Magnetization Dynamics
Presenter: S. Zhang, University of Missouri-Columbia
Authors: S. Zhang, University of Missouri-Columbia
J. He, University of Missouri-Columbia
Z. Li, University of Missouri-Columbia
Correspondent: Click to Email
The spin current induced spin torque has been written in several different forms, depending on materials as well as geometrical arrangements. We outline the key features of those various forms. Here we concentrate on two interesting issues: the effect of spin torques on the thermal assited magnetization reversal and the domain wall depinning by a spin torque. In the first case, we have demonstrated that a stochastic Fokker-Planck equation which explicitly includes the spin torque can be established and solved when the current is not too large, and thus we are able to predict finite temperature current-driven magnetization dynamics. In the second case, we investigate the effect of currents on geometrically confined domain walls. In particular, we construct domain wall pinning/depinning phase diagrams in terms of the applied magnetic field and the current. Our results agree with existing experimental data.