J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk
Phys. Rev. B 92, 054414 (2015)
We studied a finite Fibonacci sequence of Co and Py stripes aligned side by side and in direct contact with each other. Calculations based on a continuous model, including exchange and dipole interactions, were performed for structures feasible for fabrication and characterization of the main properties of magnonic quasicrystals. We have shown the fractal structure of the magnonic spectrum with a number of magnonic gaps of different widths. Moreover, localization of spin waves in quasicrystals and the existence of surface spin waves in finite quaiscrystal structure is demonstrated.
Fig.1. Intergated density fo states (IDOS) of the Fibonacci sequence S14 composed of wide Py and Co stripes of 250 nm width and 30 nm thickness. Gray areas mark the most pronounced magnonic gaps. The inset presents the magnified region of IDOS plot where the complex band-gap structure is visible.