Effect of Spin Torque on Magnetization Switching Speed Having Nonuniform Spin Distribution

Kazushige Hyodo, Chiharu Mitsumata, Akimasa Sakuma

Published 2012-11-02Version 1

We study the influence of the spin torque, which depends on the space and time derivative of magnetization, on magnetization reversal time in a ferromagnetic fine particle. The spin torque operates to dissipate the angular momentum of the magnetization precession, and the torque increases in a spin vortex structure. We calculate the magnetization reversal time under a DC magnetic field using the Landau-Lifshitz-Gilbert equation containing a spin torque term. We found that the spin torque changes the magnetization switching speed significantly during the reversal process by maintaining a spin vortex in an intermediate state.