Phys. Rev. Lett. 99, 117202 (2007) [4 pages]Rotating Vortex Dipoles in FerromagnetsReceived 5 April 2007; revised 26 May 2007; published 11 September 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.117202
DOI:
10.1103/PhysRevLett.99.117202
PACS:
75.10.Hk, 11.27.+d, 75.60.Ch, 75.75.+a
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.