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Abstract: We report on detailed broadband ferromagnetic resonance measurements ofazimuthal and radial spin wave excitations in circular Permalloy dots in thevortex ground state. Dots with aspect ratio Beta =height over radius variedfrom 0.03 to 0.1 were explored. We found that for Beta exceeding approximately0.05, variation of the spin wave eigenfrequencies with Beta deviates from thepredicted dependence. The frequency splitting of two lowest azimuthal modes wasobserved. The experimentally observed dependence of the frequency splitting onbeta was reasonably well described by dynamic splitting model accounting thespin-waves and, vortex gyrotropic mode interaction.



Autor: A.A. Awad 1, K.Y. Guslienko 2 and 3, J.F. Sierra 1, G.N. Kakazei 4, V. Metlushko 5, F. G. Aliev 1 1 Dpto. Fisica de la Materia Co

Fuente: https://arxiv.org/



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