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




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.

Author(s): Filip Lisiecki and Justyna Rychły and Piotr Kuświk and Hubert Głowiński and Jarosław W. Kłos and Felix Groß and Nick Träger and Iuliia Bykova and Markus Weigand and Mateusz Zelent and Eberhard J. Goering and Gislea Schütz and Maciej Krawczyk and Feliks Stobiecki and Janusz Dubowik and and Joachim Gräfe
Journal: Physical Review Applied
Volume: 11
Pages: 054061
Year: 2019

Department(s): Modern Magnetic Systems
Bibtex Type: Article (article)
Paper Type: Journal

DOI: https://doi.org/10.1103/PhysRevApplied.11.054061
URL: https://doi.org/10.1103/PhysRevApplied.11.054061


  title = {Magnons in a Quasicrystal: Propagation, Extinction, and Localization of Spin Waves in Fibonacci Structures},
  author = {Lisiecki, Filip and Rychły, Justyna and Kuświk, Piotr and Głowiński, Hubert and Kłos, Jarosław W. and Groß, Felix and Tr{\"a}ger, Nick and Bykova, Iuliia and Weigand, Markus and Zelent, Mateusz and Goering, Eberhard J. and Sch{\"u}tz, Gislea and Krawczyk, Maciej and Stobiecki, Feliks and Dubowik, Janusz and and Joachim Gr{\"a}fe},
  journal = {Physical Review Applied},
  volume = {11},
  pages = {054061},
  year = {2019},
  url = {https://doi.org/10.1103/PhysRevApplied.11.054061}