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...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 48; no. 11; pp. 3951 - 3954
Main Authors Hyodo, Kazushige, Mitsumata, Chiharu, Sakuma, Akimasa
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.11.2012
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Cross-disciplinary physics: materials science; rheology
Damping
Equations
Exact sciences and technology
Gilbert damping
magnetic particles
Magnetism
Magnetization
Magnetization reversal
Magnetomechanical effects
Materials science
Other topics in materials science
Physics
spin torque
Switches
Torque
Damping
Magnetic powder
spin torque
Magnetization
Gilbert damping
Switching
magnetic particles
Magnetic properties
magnetization reversal
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2012.2198913