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Published on: July 2, 2018
Nonlinear magnetic vortex dynamics in a circular nanodot excited by spin-polarized current
Konstantin Y Guslienko1, Oksana V Sukhostavets2, Dmitry V Berkov3
1Depto. Física de Materiales, Facultad de Química, Universidad del País Vasco, UPV/EHU, San Sebastián 20018, Spain ; IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain.
Abstract:
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.
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