Research Area: | Magnonics | Year: | 2019 |
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Type of Publication: | Article | Keywords: | spin waves, magnonics, quasicrystals |
Authors: |
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Journal: | Physical Review Applied | Volume: | 11 |
Pages: | 054061 | ||
BibTex: |
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Abstract: | Magnonic quasicrystals exceed the possibilities of spin-wave (SW) manipulation offered by regular
magnonic crystals, because of their more complex SW spectra with fractal characteristics. Here, we report the direct x-ray microscopic observation of propagating SWs in a magnonic quasicrystal, consisting of dipolar coupled permalloy nanowires arranged in a one-dimensional Fibonacci sequence. SWs from the first and second band as well as evanescent waves from the band gap between them are imaged. Moreover,additional mini band gaps in the spectrum are demonstrated, directly indicating an influence of
the quasiperiodicity of the system. Finally, the localization of SW modes within the Fibonacci crystal
is shown. The experimental results are interpreted using numerical calculations and we deduce a simple
model to estimate the frequency position of the magnonic gaps in quasiperiodic structures. The demonstrated features of SW spectra in one-dimensional magnonic quasicrystals allow utilizing this class of metamaterials for magnonics and make them an ideal basis for future applications. |
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