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We investigated the lifetime of spin wave eigenmodes in periodic andquasiperiodic sequences of Py and Co wires. Those materials differsignificantly in damping coefficients, therefore, the spatial distribution ofthe mode amplitude within the structure is important for the lifetime ofcollective spin wave excitations. Modes of the lower frequencies prefer toconcentrate in Py wires, because of the lower FMR frequency for this material.This inhomogeneous distribution of amplitude of modes (with lower amplitude inmaterial of higher damping and with higher amplitude in material of lowerdamping) is preferable for extending the lifetime of the collective excitationsbeyond the volume average of lifetimes for solid materials. We established therelation between the profile of the mode and its lifetime for periodic andquasiperiodic structures. We performed also the comparative studies in order tofind the differences resulting from complexity of the structure and enhancementof localization in quasiperiodic system on the lifetime of spin waves.

Spin wave damping in periodic and quasiperiodic magnonic structures