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

Filip Lisiecki, Justyna Rychły, Piotr Kuświk, Hubert Głowiński, Jarosław W. Kłos, Felix Groß, Nick Träger, Iuliia Bykova, Markus Weigand, Mateusz Zelent, Eberhard J. Goering, Gislea Schütz, Maciej Krawczyk, Feliks Stobiecki, Janusz Dubowik, and Joachim Gräfe
Phys. Rev. Applied 11, 054061 – Published 22 May 2019
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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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  • Received 7 January 2019
  • Revised 17 April 2019

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

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Filip Lisiecki1, Justyna Rychły2, Piotr Kuświk1,3, Hubert Głowiński1, Jarosław W. Kłos2,4, Felix Groß5, Nick Träger5, Iuliia Bykova5, Markus Weigand5, Mateusz Zelent2, Eberhard J. Goering5, Gislea Schütz5, Maciej Krawczyk2, Feliks Stobiecki1, Janusz Dubowik1, and Joachim Gräfe5,*

  • 1Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland
  • 2Faculty of Physics, Adam Mickiewicz University, Poznań, Poland
  • 3Centre for Advanced Technologies, Adam Mickiewicz University, Poznań, Poland
  • 4Institute of Physics,University of Greifswald, Greifswald, Germany
  • 5Max Planck Institute for Intelligent Systems, Stuttgart, Germany

  • *graefe@is.mpg.de

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Vol. 11, Iss. 5 — May 2019

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