Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

TL;DR

This paper demonstrates numerically how a magnonic Gires-Tournois interferometer can precisely control the phase of reflected spin waves, enabling advanced interference control and potential sensor applications.

Contribution

It introduces a novel magnonic interferometer design that allows phase control of spin waves through geometrical tuning, advancing magnonic device capabilities.

Findings

Reflected spin wave phase is highly sensitive to geometrical parameters.

Resonances depend on film, stripe, and spacer thicknesses.

Potential for developing magnonic metasurfaces and sensors.

Abstract

The phase is one of the fundamental properties of a wave that allows to control interference effects and can be used to efficiently encode information. We examine numerically a magnonic resonator of the Gires-Tournois interferometer type, which enables the control of the phase of spin waves reflected from the edges of the ferromagnetic film. The considered interferometer consists of a Py thin film and a thin, narrow Py stripe placed above its edge, both coupled magnetostatically. We show that the resonances and the phase of the reflected spin waves are sensitive for a variation of the geometrical parameters of this bi-layerd part of the system. The high sensitivity to film, stripe, and non-magnetic spacer thicknesses, offers a prospect for developing magnonic metasurfaces and sensors.