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Magnonic quasicrystals exceed the possibilities of spin wave (SW)manipulation offered by regular magnonic crystals, because of their morecomplex SW spectra with fractal characteristics. Here, we report the directx-ray microscopic observation of propagating SWs in a magnonic quasicrystal,consisting of dipolarly coupled permalloy nanowires arranged in aone-dimensional Fibonacci sequence. SWs from the first and second band as wellas evanescent waves from the band gap between them are imaged. Moreover,additional mini-band gaps in the spectrum are demonstrated, directly indicatingan influence of the quasiperiodicity of the system. The experimental resultsare interpreted using numerical calculations and we deduce a simple model toestimate the frequency position of the magnonic gaps in quasiperiodicstructures. The demonstrated features of SW spectra in one-dimensional magnonicquasicrystals allows utilizing this class of metamaterials for magnonics andmakes them an ideal basis for future applications.

Magnons in a Quasicrystal: Propagation, Localization and Extinction of Spin Waves in Fibonacci Structures