Abstract
Magnonic quasicrystals can be used to manipulate spin waves, offering possibilities beyond those of periodic magnonic crystals. The authors investigate one-dimensional magnonic Fibonacci quasicrystals and demonstrate the existence of collective spin waves over a broad range of wave vectors. The spin-wave spectra here are tunable by changing magnetic field amplitude (for continuous band-structure adjustment), magnetization configuration (for reprogrammability), or the dimensions of the elements (for scalability). Beyond being fundamentally interesting, these properties show that magnonic quasicrystals are promising for tomorrow's spintronic, microwave, and magnonic technologies.
Highlights
In magnonic crystals (MCs), the band structure of allowed and forbidden frequencies for spin waves (SWs) can be tuned on demand by using an external magnetic field
Magnonic quasicrystals, which exhibit long-range order but no periodicity, offer possibilities beyond MC, such as fractal characteristics [7] and a larger number of forbidden and allowed magnonic bands, which are found in the linear regime
We investigate, experimentally and numerically, SW dynamics in 1D magnonic quasicrystals composed of Py NWs of two different widths, arranged in a Fibonacci sequence, to demonstrate the power of these systems to precisely tune the SW spectra
Summary
In magnonic crystals (MCs), the band structure of allowed and forbidden frequencies for spin waves (SWs) can be tuned on demand by using an external magnetic field. This unique feature offers fine tuning and reprogrammability [1,2,3,4], which are desirable for potential applications [5] but are not obtained in photonic or plasmonic crystals [6]. Other works concern two-dimensional (2D) systems such as Penrose structures [16]
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