Effect of Spin Torque on Magnetization Switching Speed Having Nonuniform   Spin Distribution
  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. 
Kazushige Hyodo, Chiharu Mitsumata and Akimasa Sakuma
cond-mat.mes-hall