A nonlinear magnonic nano-ring resonator

TL;DR

This paper introduces a nonlinear nanoscale magnonic ring resonator that acts as a notch filter and can be tuned for neuromorphic and logic applications, supported by analytical and micromagnetic studies.

Contribution

It presents a novel nonlinear magnonic ring resonator device with analytical modeling and micromagnetic validation for use in magnonic logic and neuromorphic circuits.

Findings

Efficient spin-wave transmission suppression in the linear regime.

Resonance frequency shifts with input power, enabling neuron-like activation functions.

Validated analytical model matches micromagnetic simulations.

Abstract

The field of magnonics, which aims at using spin waves as carriers in data processing devices, has attracted increasing interest in recent years. We present and study micromagnetically a nonlinear nanoscale magnonic ring resonator device for enabling implementations of magnonic logic gates and neuromorphic magnonic circuits. In the linear regime, this device efficiently suppresses spin-wave transmission using the phenomenon of critical resonant coupling, thus exhibiting the behavior of a notch filter. By increasing the spin-wave input power, the resonance frequency is shifted leading to transmission curves, depending on the frequency, reminiscent of the activation functions of neurons or showing the characteristics of a power limiter. An analytical theory is developed to describe the transmission curve of magnonic ring resonators in the linear and nonlinear regimes and validated by a comprehensive micromagnetic study. The proposed magnonic ring resonator provides a multi-functional nonlinear building block for unconventional magnonic circuits.