Rotating vortex dipoles in ferromagnets

Details Rotating vortex dipoles in ferromagnets Rotating vortex dipoles in ferromagnets

2007-05-21

arxiv.org/abs/0705.2977v1

Phys. Rev. Lett. 99, 117202 (2007)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.99.117202

Vortex-antivortex pairs are localized excitations and have been found to be spontaneously created in magnetic elements. In the case that the vortex and the antivortex have opposite polarities the pair has a nonzero topological charge, and it behaves as a rotating vortex dipole. We find theoretically, and confirm numerically, the form of the energy as a function of the angular momentum of the system and the associated rotation frequencies. We discuss the process of annihilation of the pair which changes the topological charge of the system by unity while its energy is monotonically decreasing. Such a change in the topological charge affects profoundly the dynamics in the magnetic system. We finally discuss the connection of our results with Bloch Points (BP) and the implications for BP dynamics.

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