A magnonic directional coupler for integrated magnonic half-adders

TL;DR

This paper introduces a compact, integrated magnonic directional coupler using yttrium iron garnet waveguides, enabling efficient spin-wave based logic operations like half-adders with low energy consumption.

Contribution

The work presents a novel, nanoscale magnonic directional coupler and demonstrates its application in an integrated magnonic half-adder, advancing magnonic circuit technology.

Findings

Successful design of a 350 nm wide magnonic directional coupler

Simulation of a magnonic half-adder using the couplers

Potential for low-energy, integrated magnonic computing

Abstract

Magnons, the quanta of spin waves, could be used to encode information in beyond-Moore computing applications, and magnonic device components, including logic gates, transistors, and units for non-Boolean computing, have already been developed. Magnonic directional couplers, which can function as circuit building blocks, have also been explored, but have been impractical because of their millimetre dimensions and multi-mode spectra. Here, we report a magnonic directional coupler based on yttrium iron garnet single-mode waveguides of 350 nm width. We use the amplitude of a spin-wave to encode information and to guide it to one of the two outputs of the coupler depending on the signal magnitude, frequency, and the applied magnetic field. Using micromagnetic simulations, we also propose an integrated magnonic half-adder that consists of two directional couplers and processes all information within the magnon domain with aJ energy consumption.