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arXiv · 1102.3711

Effects of disorder on magnetic vortex gyration

Hongki Min·R. D. McMichael·Jacques Miltat·M. D. Stiles
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Abstract

A vortex gyrating in a magnetic disk has two regimes of motion in the presence of disorder. At large gyration amplitudes, the vortex core moves quasi-freely through the disorder potential. As the amplitude decreases, the core can become pinned at a particular point in the potential and precess with a significantly increased frequency. In the pinned regime, the amplitude of the gyration decreases more rapidly than it does at larger precession amplitudes in the quasi-free regime. In part, this decreased decay time is due to an increase in the effective damping constant and in part due to geometric distortion of the vortex. A simple model with a single pinning potential illustrates these two contributions.

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Hongki Min, R. D. McMichael, Jacques Miltat, M. D. Stiles. 2011-02-17. Effects of disorder on magnetic vortex gyration. https://doi.org/10.1103/physrevb.83.064411

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