Dynamics of vortex-antivortex pairs in ferromagnets
| dc.creator | Komineas, Stavros | |
| dc.creator | Papanicolaou, Nikos | |
| dc.date | 2007-12-21 | |
| dc.date.accessioned | 2026-07-07T08:50:52Z | |
| dc.date.available | 2026-07-07T08:50:52Z | |
| dc.description | We study the dynamics of vortex-antivortex (VA) pairs in an infinitely thin ferromagnetic film with easy-plane anisotropy. These are localized excitations with finite energy that are characterized by a topological (skyrmion) number N = 0,+1,-1. Topologically trivial (N=0) VA pairs undergo Kelvin motion analogous to that encountered in fluid dynamics. In contrast, topologically nontrivial (N = +1,-1) VA pairs perform rotational motion around a fixed guiding center. We present the results of a detailed study in both cases and further demonstrate that in the presence of dissipation a rotating N = +1,-1 VA pair shrinks to a point and is annihilated, due to the discreteness of the lattice, thus leading to a "topologically forbidden" (Delta N = 1) process. We argue that the latter process underlies the experimentally observed vortex core switching whereby the polarity of a single vortex is reversed after collision with an N = 0 VA pair created by a burst of an applied alternating magnetic field. | |
| dc.description | review article, 18 pages | |
| dc.identifier | https://arxiv.org/abs/0712.3684 | |
| dc.identifier | http://arxiv.org/abs/0712.3684 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/144745 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Materials Science | |
| dc.title | Dynamics of vortex-antivortex pairs in ferromagnets | |
| dc.type | text |