RT Journal Article
T1 Stochastic vortex dynamics in two-dimensional easy-plane ferromagnets: Multiplicative versus additive noise
A1 Kamppeter, Till
A1 Mertens, Franz G.
A1 Moro, Esteban
A1 Sánchez, Angel
A1 Bishop, Alan R.
AB We study how thermal fluctuations affect the dynamics of vortices in the two-dimensional classical, ferromagnetic,anisotropic Heisenberg model depending on their additive or multiplicative character. Using acollective coordinate theory, we analytically show that multiplicative noise, arising from fluctuations in thelocal-field term of the Landau-Lifshitz equations, and Langevin-like additive noise both have the same effecton vortex dynamics ~within a very plausible assumption consistent with the collective coordinate approach!.This is a nontrivial result, as multiplicative and additive noises usually modify the dynamics quite differently.We also carry out numerical simulations of both versions of the model finding that they indeed give rise to verysimilar vortex dynamics.
PB American Physical Society
SN 1098-0121 (print version)
SN 1550-235X (online version)
YR 1999
FD 1999-05-01
LK http://hdl.handle.net/10016/15125
UL http://hdl.handle.net/10016/15125
LA eng
DS e-Archivo
RD 28 abr. 2024