Bistable nanomagnet as programmable phase inverter for spin waves

TL;DR

This paper demonstrates a programmable phase inverter for spin waves using a bistable nanomagnet in a magnonic crystal, enabling low-loss phase shifts crucial for spin wave logic gates.

Contribution

It introduces a nanomagnet-based phase inverter that achieves controlled phase shifts in spin waves through resonant standing modes, advancing spin wave logic device design.

Findings

Achieved low-loss phase inversion with nanostripes of opposed magnetization.

Demonstrated phase shifts upon a single nanostripe with opposite magnetization.

Modeled the experimental results with micromagnetic simulations across various parameters.

Abstract

To realize spin wave logic gates programmable phase inverters are essential. We image with phase-resolved Brillouin light scattering microscopy propagating spin waves in a one-dimensional magnonic crystal consisting of dipolarly coupled magnetic nanostripes. We demonstrate phase shifts upon a single nanostripe of opposed magnetization. Using micromagnetic simulations we model our experimental finding in a wide parameter space of bias fields and wave vectors. We find that low-loss phase inversion is achieved, when the internal field of the oppositely magnetized nanostripe is tuned such that the latter supports a resonant standing spin wave mode with odd quantization number at the given frequency. Our results are key for the realization of phase inverters with optimized signal transmission.