Stochastic vortex dynamics in two-dimensional easy-plane ferromagnets: Multiplicative versus additive noise

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dc.contributor.author Kamppeter, Till
dc.contributor.author Mertens, Franz G.
dc.contributor.author Moro Egido, Esteban
dc.contributor.author Sánchez, Angel
dc.contributor.author Bishop, Alan R.
dc.date.accessioned 2012-08-23T11:35:02Z
dc.date.available 2012-08-23T11:35:02Z
dc.date.issued 1999-05-01
dc.identifier.bibliographicCitation Physical Review B, vol. 59, n. 17, 1 may 1999. Pp. 11349-11357
dc.identifier.issn 1098-0121 (print version)
dc.identifier.issn 1550-235X (online version)
dc.identifier.uri http://hdl.handle.net/10016/15125
dc.description.abstract 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 a collective coordinate theory, we analytically show that multiplicative noise, arising from fluctuations in the local-field term of the Landau-Lifshitz equations, and Langevin-like additive noise both have the same effect on 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 very similar vortex dynamics.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Physical Society
dc.title Stochastic vortex dynamics in two-dimensional easy-plane ferromagnets: Multiplicative versus additive noise
dc.type article
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1103/PhysRevB.59.11349
dc.subject.eciencia Matemáticas
dc.identifier.doi 10.1103/PhysRevB.59.11349
dc.rights.accessRights openAccess
dc.type.version publishedVersion
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