Parametric excitations of coupled nanomagnets

TL;DR

This paper demonstrates the coupling of parametrically excited eigenmodes in nanomagnets, showing stable phase relations and potential applications in logic, neuromorphic systems, and Ising machines.

Contribution

It introduces a method to achieve controllable coupling of nanomagnet eigenmodes via geometry and excitation frequency, enabling new computational device concepts.

Findings

Positive and negative couplings realized

Oscillations stable against thermal fluctuations

Hysteretic phase behavior observed

Abstract

We demonstrate that parametrically excited eigenmodes in nearby nanomagnets can be coupled to each other. Both positive (in-phase) and negative (anti-phase) couplings can be realized by a combination of appropriately chosen geometry and excitation field frequency. The oscillations are sufficiently stable against thermal fluctuations. The phase relation between field-coupled nanomagnets shows a hysteretic behavior with the phase relation being locked over a wide frequency range. We envision that this computational study lays the groundwork to use field-coupled nanomagnets as parametrons as building blocks of logic devices, neuromorphic systems or Ising machines.