Dynamics and switching processes for magnetic bubbles in nanoelements
- Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom)
- Department of Applied Mathematics, University of Crete, Knossou Avenue, 71409 Heraklion Crete (Greece)
We study numerically the dynamics of a magnetic bubble in a disk-shaped magnetic element which is probed by a pulse of a magnetic field gradient. Magnetic bubbles are nontrivial magnetic configurations which are characterized by a topological (skyrmion) number N and they have been observed in mesoscopic magnetic elements with strong perpendicular anisotropy. For weak fields we find a skew deflection of the axially symmetric N=1 bubble and a subsequent periodic motion around the center of the dot. This gyrotropic motion of the magnetic bubble is shown here for the first time. Stronger fields induce switching of the N=1 bubble to a bubble which contains a pair of Bloch lines and has N=0. The N=0 bubble can be switched back to a N=1 bubble by applying again an external field gradient. Detailed features of the unusual bubble dynamics are described by employing the skyrmion number and the moments of the associated topological density.
- OSTI ID:
- 21287028
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 79, Issue 22; Other Information: DOI: 10.1103/PhysRevB.79.224429; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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