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

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 dipolarly 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. 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 allows utilizing this class of metamaterials for magnonics and makes them an ideal basis for future applications.

arXiv comment10 pages, 6 figures

References in corpus (6)

• The 2014 Magnetism Roadmap
• Spin wave spectrum of a magnonic crystal with an isolated defect
• Spin waves in one-dimensional bi-component quasicrystals
• Band structure of magnonic crystals with defects: Brillouin spectroscopy and micromagnetic simulations
• Spin wave damping in periodic and quasiperiodic magnonic structures
• Spin wave surface states in one-dimensional planar magnonic crystals

Cited by in corpus (12)

• Magnetization Dynamics of Nanoscale Magnetic Materials: A Perspective
• Dynamics of reconfigurable artificial spin ice: towards magnonic functional materials
• Real space observation of magnon interaction with driven space-time crystals
• An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides
• Influence of nonmagnetic dielectric spacers on the spin wave response of one-dimensional planar magnonic crystals
• Josephson effect in a Fibonacci quasicrystal
• Topological superconductivity in Fibonacci quasicrystals
• Fractalized magnon transport on the quasicrystal with enhanced stability
• Gænice: a general model for magnon band structure of artificial spin ices
• Nonstanding spin waves in a single rectangular permalloy microstrip under uniform magnetic excitation
• The Fibonacci quasicrystal: case study of hidden dimensions and multifractality
• Magnetization Dynamics in Quasiperiodic Magnonic Crystals