Excitation of spin dynamics by spin-polarized current in vortex state disks

Details Excitation of spin dynamics by spin-polarized current in vortex state disks Excitation of spin dynamics by spin-polarized current in vortex state disks

2007-07-27

arxiv.org/abs/0707.4128v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.99.247208

A spin-polarized current with the polarization perpendicular to the plane of a vortex-state disk results in renormalization of the effective damping for a given magnetization mode, and the effective damping becomes zero if the current exceeds a threshold value. The lowest threshold current corresponds to the lowest frequency vortex gyroscopic mode. For larger values of the current the dynamic magnetization state is characterized by precession of the vortex around the dot center with non-small amplitude and higher frequency.

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