Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.247203
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Funding
- Creative Research Initiatives (ReC-SDSW) of MEST/KOSEF
- Army Research Office of the USA [W911NF-0410247]
- National Science Foundation of the USA [ECCS-0653901]
- Oakland University Foundation
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A spin-wave theory explaining experimentally observed frequency splitting of dynamical spin excitations with azimuthal symmetry of a magnetic dot in a vortex ground state is developed. It is shown that this splitting is a result of the dipolar hybridization of three spin-wave modes of a dot having azimuthal indices m=1: two high-frequency azimuthal dipolar modes of the in-plane part of the vortex with indices m=+/- 1 and a low-frequency (Goldstone-like) gyrotropic mode, describing translational motion of the vortex core and having index m=+1. The analytically calculated magnitude of the frequency splitting is proportional to the ratio of the dot thickness to its radius and quantitatively agrees with the results of time-resolved Kerr experiments.
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