Design and optimization of one-dimensional ferrite-film based magnonic crystals

TL;DR

This paper investigates the scattering of spin waves in one-dimensional magnonic crystals made from yttrium-iron garnet films, demonstrating how geometrical parameters influence their transmission properties and enabling tailored device design.

Contribution

It provides a combined experimental and theoretical analysis of how geometrical parameters affect magnonic crystal performance, offering a model for engineering desired characteristics.

Findings

Well-defined rejection frequency bands observed

Transmission characteristics depend on film and groove parameters

Theoretical model accurately describes experimental data

Abstract

One-dimensional magnonic crystals have been implemented as gratings of shallow grooves chemically etched into the surface of yttrium-iron garnet films. Scattering of backward volume magnetostatic spin waves from such structures is investigated experimentally and theoretically. Well-defined rejection frequency bands are observed in transmission characteristics of the magnonic crystals. The loss inserted by the gratings and the rejections bands bandwidths are studied as a function of the film thickness, the groove depth, the number of grooves, and the groove width. The experimental data are well described by a theoretical model based on the analogy of a spin-wave film-waveguide with a microwave transmission line. Our study shows that magnonic crystals with required operational characteristics can be engineered by adjusting these geometrical parameters.