3 páginas, 2 figuras.-- et al.Broadband ferromagnetic resonance in square arrays of Permalloy circular dots with different interdot separations was measured in the vortex ground state. The detected spin excitations show a complicated dependence of their frequencies on the interdot coupling strength. A considerable influence of the interdot separation on the gyrotropic vortex frequency and splitting of the azimuthal spin wave frequencies was detected. The gyrotropic frequency and the first azimuthal doublet frequency splitting depend nonmonotonously on the interdot spacing, whereas the dependence of the second doublet frequency splitting on this parameter is monotonous. The observed effects are explained by the influence of both the dipolar and quadrupolar contributions to the dynamic magnetostatic interactions.The work in Madrid was supported by Spanish MICINN
(Grant Nos. MAT2009-10139, MAT2006-28183-E, and
CSD2007-00010) and CAM (Grant No. S-505/MAT0194).
K.Y.G. and G.R.A. acknowledge support by IKERBASQUE
(the Basque Science Foundation), JAE-doc grant and the
SAIOTEK Grant No. S-PC09UN03. G.N.K. acknowledges
support from Portuguese FCT through the “Ciencia 2007”
program. The work in Kiev was supported by the STCU
Grant No. 5210 and the Grant No. 220-10 from NAS of
Ukraine.Peer reviewe
