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Duffing oscillation-induced reversal of magnetic vortex core by a resonant perpendicular magnetic field.

  • Author(s): Moon, Kyoung-Woong
  • Chun, Byong Sun
  • Kim, Wondong
  • Qiu, ZQ
  • Hwang, Chanyong
  • et al.

Published Web Location

https://www.nature.com/articles/srep06170.pdf
No data is associated with this publication.
Abstract

Nonlinear dynamics of the magnetic vortex state in a circular nanodisk was studied under a perpendicular alternating magnetic field that excites the radial modes of the magnetic resonance. Here, we show that as the oscillating frequency is swept down from a frequency higher than the eigenfrequency, the amplitude of the radial mode is almost doubled to the amplitude at the fixed resonance frequency. This amplitude has a hysteresis vs. frequency sweeping direction. Our result showed that this phenomenon was due to a Duffing-type nonlinear resonance. Consequently, the amplitude enhancement reduced the vortex core-switching magnetic field to well below 10 mT. A theoretical model corresponding to the Duffing oscillator was developed from the Landau-Lifshitz-Gilbert equation to explore the physical origin of the simulation result. This work provides a new pathway for the switching of the magnetic vortex core polarity in future magnetic storage devices.

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