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.
, McMichael, R.
, Miltat, J.
and Stiles, M.
Effects of disorder on magnetic vortex gyration, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906934
(Accessed September 21, 2023)