Magnonic Fabry-P\'{e}rot resonators as programmable phase shifters

TL;DR

This paper demonstrates that magnonic Fabry-Pérot resonators, composed of YIG films and CoFeB nanostripes, can serve as programmable, low-loss phase shifters for spin-wave computing, with phase control achieved through magnetic switching.

Contribution

The study introduces a novel magnonic resonator design that enables on-demand phase shifting of spin waves via magnetic configuration, advancing reconfigurable magnonic circuit technology.

Findings

Resonators induce a π phase shift in transmitted spin waves.

Phase shift is highly sensitive to magnetization alignment.

Resonators exhibit low-loss transmission suitable for reconfigurable circuits.

Abstract

We explore the use of magnonic Fabry-P\'erot resonators as programmable phase shifters for spin-wave computing. The resonator, composed of a yttrium iron garnet (YIG) film coupled with a CoFeB nanostripe, operates through dynamic dipolar coupling, leading to wavelength downconversion and the formation of a magnonic cavity. Using super-Nyquist sampling magneto-optical Kerr effect (SNS-MOKE) microscopy and micromagnetic simulations, we demonstrate that these resonators can induce a $\pi$ phase shift in the transmitted spin wave. The phase shift is highly sensitive to the magnetization alignment within the resonator, allowing for on-demand control via magnetic switching. This feature, combined with low-loss transmission, positions the magnonic Fabry-P\'erot resonator as a promising component for reconfigurable magnonic circuits and spin-wave computing devices.