Effects of disorder on magnetic vortex gyration

Details Effects of disorder on magnetic vortex gyration Effects of disorder on magnetic vortex gyration

2011-02-17

arxiv.org/abs/1102.3711v1

Phys. Rev. B 83, 064411 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.83.064411

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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