Scattering of backward spin waves in a one-dimensional magnonic crystal

TL;DR

This paper experimentally investigates how backward spin waves scatter in a one-dimensional magnonic crystal with shallow grooves, revealing rejection bands whose properties depend on groove depth, supported by a theoretical model.

Contribution

It provides new experimental data and a theoretical interpretation of spin wave scattering in magnonic crystals with shallow surface grooves.

Findings

Rejection frequency bands are clearly observed.

Rejection efficiency increases with groove depth.

Frequency width of rejection bands increases with groove depth.

Abstract

Scattering of backward volume magnetostatic spin waves from a one-dimensional magnonic crystal, realized by a grating of shallow grooves etched into the surface of an yttrium-iron garnet film, was experimentally studied. Rejection frequency bands were clearly observed. The rejection efficiency and the frequency width of the rejection bands increase with increasing groove depth. A theoretical model based on the analogy of a spin-wave film-waveguide with a microwave transmission line was used to interpret the obtained experimental results.