Nonlinear magnetic vortex dynamics in a circular nanodot excited by spin-polarized current
Ikusi/ Ireki
Data
2014-08-08Egilea
Gusliyenko, Kostyantyn
Sukhostavets, Oksana
Berkov, Dmitry V.
Nanoscale Research Letters 9 : (2014) // Article ID 386
Laburpena
We investigate analytically and numerically nonlinear vortex spin torque oscillator dynamics in a circular magnetic nanodot induced by a spin-polarized current perpendicular to the dot plane. We use a generalized nonlinear Thiele equation including spin-torque term by Slonczewski for describing the nanosize vortex core transient and steady orbit motions and analyze nonlinear contributions to all forces in this equation. Blue shift of the nano-oscillator frequency increasing the current is explained by a combination of the exchange, magnetostatic, and Zeeman energy contributions to the frequency nonlinear coefficient. Applicability and limitations of the standard nonlinear nano-oscillator model are discussed.