We study the influence of the spin torque, which depends on the space andtime derivative of magnetization, on magnetization reversal time in aferromagnetic fine particle. The spin torque operates to dissipate the angularmomentum of the magnetization precession, and the torque increases in a spinvortex structure. We calculate the magnetization reversal time under a DCmagnetic field using the Landau-Lifshitz-Gilbert equation containing a spintorque term. We found that the spin torque changes the magnetization switchingspeed significantly during the reversal process by maintaining a spin vortex inan intermediate state.
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