Rotating Vortex Dipoles in Ferromagnets

S. Komineas
Phys. Rev. Lett. 99, 117202 – Published 11 September 2007

Abstract

Vortex-antivortex pairs are spontaneously created in magnetic elements. In the case of opposite vortex polarities the pair has a nonzero topological charge, and it behaves as a rotating vortex dipole. We find theoretically and confirm numerically its energy as a function of angular momentum and the associated rotation frequencies. The annihilation process of the pair changes the topological charge while the energy is monotonically decreasing. The change of topological charge affects the dynamics profoundly. We finally discuss the implications of our results for Bloch point dynamics.

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  • Received 5 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.117202

©2007 American Physical Society

Authors & Affiliations

S. Komineas

  • Max-Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, 01187, Dresden, Germany

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Issue

Vol. 99, Iss. 11 — 14 September 2007

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