Magnonic band gaps in YIG based magnonic crystals: array of grooves versus array of metallic stripes

TL;DR

This study compares magnonic band gaps in YIG-based magnonic crystals with metallic stripes and grooves, analyzing their properties experimentally and theoretically for potential miniaturization and applications.

Contribution

It provides a comparative analysis of two types of planar magnonic crystals, highlighting the influence of nonreciprocal spin wave properties on band gap characteristics.

Findings

Metallic stripes significantly affect magnonic band gap width.

Nonreciprocal dispersion influences band gap dependence on magnetic field.

Both structures show potential for miniaturization and applications.

Abstract

The magnonic band gaps of the two types of planar one-dimensional magnonic crystals comprised of the periodic array of the metallic stripes on yttrium iron garnet (YIG) film and YIG film with an array of grooves was analyzed experimentally and theoretically. In such periodic magnetic structures the propagating magnetostatic surface spin waves were excited and detected by microstripe transducers with vector network analyzer and by Brillouin light scattering spectroscopy. Properties of the magnonic band gaps were explained with the help of the finite element calculations. The important influence of the nonreciprocal properties of the spin wave dispersion induced by metallic stripes on the magnonic band gap width and its dependence on the external magnetic field has been shown. The usefulness of both types of the magnonic crystals for potential applications and possibility for miniaturization are discussed.