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

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3 Author(s)
Hyodo, K. ; Dept. of Appl. Phys., Tohoku Univ., Sendai, Japan ; Mitsumata, C. ; Sakuma, A.

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.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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