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Effects of disorder on magnetic vortex gyration



Hongki Min, Robert McMichael, Jacques Miltat, Mark D. Stiles


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.
Physical Review B


magnetic vortex, micromagnetics, gyration, magnetic damping, precession, Landau-Lifshitz-Gilbert


Min, H. , McMichael, R. , Miltat, J. and Stiles, M. (2011), Effects of disorder on magnetic vortex gyration, Physical Review B, [online], (Accessed April 20, 2024)
Created February 14, 2011, Updated October 12, 2021