Effect of Spin Torque on Magnetization Switching Speed Having Nonuniform Spin Distribution
arXiv:1211.0360 · doi:10.1109/TMAG.2012.2198913
Abstract
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.
4 pages, 4 figures