Micromagnetic Modeling of Magnetization Reversal in Nano-Scale Point Contact Devices

This paper deals with micromagnetic model of magnetization reversal in nano scale-point contact devices driven by nonuniform injection of a spin-polarized current. A computational study of the magnetization reversal in the nanosecond regime will be presented considering the influence of the current density distribution below the aperture region on the reversal time. For high current values, a strong dependence of the reversal time on the current distribution has been observed. Finally, results of micromagnetic simulations show that the reversal time versus current behaviour (at T=0K) is monotonic, very different from the switching processes observed in standard spin valves and magnetic tunnel junctions with uniform current injection.