| 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: |
 Click here to retrieve PDF version of paper (459KB) |
