Nonlinear magnetic vortex dynamics in a circular nanodot excited by spin-polarized current

被引：0
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作者：
Konstantin Y Guslienko
Oksana V Sukhostavets
Dmitry V Berkov
机构：
[1] Universidad del País Vasco,Depto. Física de Materiales, Facultad de Química
[2] UPV/EHU,undefined
[3] IKERBASQUE,undefined
[4] Basque Foundation for Science,undefined
[5] General Numerics Research Laboratory,undefined
来源：
Nanoscale Research Letters | / 9卷
关键词：
Magnetic nanodot; Nano-oscillator; Vortex; Spin torque transfer;
D O I：
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摘要：
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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