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Publication Citation: Effects of disorder on magnetic vortex gyration

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Author(s): Hongki Min; Robert D. McMichael; Jacques Miltat; Mark D. Stiles;
Title: Effects of disorder on magnetic vortex gyration
Published: February 15, 2011
Abstract: A vortex gyrating in a magnetic disc has two regimes of motion in the presence of disorder. At large 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 precession decreases more rapidly than 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.
Citation: Physical Review B
Volume: 83
Pages: 9 pp.
Keywords: magnetic vortex, micromagnetics, gyration, magnetic damping, precession, Landau-Lifshitz-Gilbert
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (471KB)