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

Abstract

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.

References in corpus (6)

• Magnetic Vortex Core Dynamics in a Ferromagnetic Dot
• Current-induced Vortex Motion by Spin-Transfer Torque
• Magnon modes and magnon-vortex scattering in two-dimensional easy-plane ferromagnets
• Magnon modes for thin circular vortex state magnetic dot
• Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots
• Vortex polarity switching by a spin--polarized current

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