Physics – Condensed Matter – Materials Science
Scientific paper
2008-08-25
Phys. Rev. Lett. 101, 247203 (2008)
Physics
Condensed Matter
Materials Science
10 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.101.247203
A spin wave theory explaining experimentally observed frequency splitting of dynamical 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 excitation modes of the in-plane part of the vortex with indices m = +/-1 and a low-frequency m= +1 gyrotropic mode describing the translational motion of the vortex core. 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.
Guslienko Konstantin Y.
Kim Sang-Koog
Slavin Andrei N.
Tiberkevich Vasyl
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