Brillouin light scattering studies of planar metallic magnonic crystals

TL;DR

This paper reviews how Brillouin light scattering is used to analyze the spin-wave spectra of planar magnonic crystals, highlighting their tunable frequency bands for microwave device applications.

Contribution

It provides a comprehensive review of the spectral properties of planar magnonic crystals studied via Brillouin light scattering, emphasizing tunability and fabrication aspects.

Findings

Discrete frequencies form finite bands in arrays of nanoelements.

Frequency bands can be tuned by geometry, material, and magnetic field.

Potential applications in microwave filters and waveguides.

Abstract

The application of Brillouin light scattering to the study of the spin-wave spectrum of one- and two-dimensional planar magnonic crystals consisting of arrays of interacting stripes, dots and antidots is reviewed. It is shown that the discrete set of allowed frequencies of an isolated nanoelement becomes a finite-width frequency band for an array of identical interacting elements. It is possible to tune the permitted and forbidden frequency bands, modifying the geometrical or the material magnetic parameters, as well as the external magnetic field. From a technological point of view, the accurate fabrication of planar magnonic crystals and a proper understanding of their magnetic excitation spectrum in the GHz range is oriented to the design of filters and waveguides for microwave communication systems.