Scattering of surface and volume spin waves in a magnonic crystal

TL;DR

This paper compares how surface and volume spin waves in a magnonic crystal are scattered and rejected at different groove depths, revealing that volume waves are more effectively suppressed than surface waves.

Contribution

It provides a comparative analysis of surface and volume spin wave scattering in a magnonic crystal, highlighting differences in rejection efficiency and the effects of nonreciprocity.

Findings

Volume spin waves exhibit larger rejection bands than surface spin waves.

Rejection efficiency depends on groove depth and wave mode.

Nonreciprocity influences scattering and rejection characteristics.

Abstract

The operational characteristics of a magnonic crystal, which was fabricated as an array of shallow grooves etched on a surface of a magnetic film, were compared for magnetostatic surface spin waves and backward volume magnetostatic spin waves. In both cases the formation of rejection frequency bands was studied as a function of the grooves depth. It has been found that the rejection of the volume wave is considerably larger than of the surface one. The influences of the nonreciprocity of the surface spin waves as well as of the scattering of the lowest volume spin-wave mode into higher thickness volume modes on the rejection efficiency are discussed.