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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|
|Keywords:||magnetic vortex, micromagnetics, gyration, magnetic damping, precession, Landau-Lifshitz-Gilbert|
|PDF version:||Click here to retrieve PDF version of paper (471KB)|