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Lifetime of vortices in 2D easy-plane ferromagnets

D. A. Dimitrov and G. M. Wysin
Department of Physics, Kansas State University, Manhattan, KS 66506-2601

Fri Sep 1 16:26:56 CDT 1995


We use a combination of classical Monte Carlo and spin dynamics simulations for the 2D classical easy-plane ferromagnet to estimate the lifetime of free vortices near the Kosterlitz-Thouless transition temperature. Using thermal equilibrium initial states from Monte Carlo, the spin equations of motion are integrated numerically and the number fluctuations of free vortices are used to calculate the lifetime. The inverse lifetime gives an estimate for a cutoff frequency below which an ideal gas description of vortex dynamics is inappropriate. For this reason we compare the lifetime results with simulations and ideal gas phenomenology for the dynamic structure function, .

PACS numbers: 75.10.Hk, 75.30.Ds, 75.40.Gb, 75.40.Mg

Submitted to Physical Review Letters

This preprint also available in RevTeX. (A zipped file including postscript figures).

Gary M Wysin
Fri Sep 1 16:26:33 CDT 1995