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Effects of disorder on magnetic vortex gyration

Published

Author(s)

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

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

Keywords

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

Citation

Min, H. , McMichael, R. , Miltat, J. and Stiles, M. (2011), Effects of disorder on magnetic vortex gyration, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906934 (Accessed September 30, 2022)
Created February 14, 2011, Updated October 12, 2021