Abstract
We have investigated the spin wave modes in perpendicularly magnetized permalloy nanodots as a function of film thickness using field modulated perpendicular ferromagnetic resonance spectroscopy. We observed mode intensity inversion with an increase in dot thickness. In thicker dots, one ellusive antisymmetric spin wave mode was also detected due to the asymmetric nature of the excitation signal. In the case of the thickest nanodot, a circulating chiral mode near the dot surface was also observed. Our experimental results are in good qualitative agreement with the dynamic micromagnetic simulations.
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