Nonlocal stimulation of three-magnon splitting in a magnetic vortex

TL;DR

This study demonstrates that stimulated three-magnon splitting in a magnetic vortex disk can be triggered below threshold through nonlocal excitation, with potential applications in magnonic nonlinear networks for computing.

Contribution

It provides a combined numerical, theoretical, and experimental analysis showing nonlocal stimulation of three-magnon splitting in magnetic vortices, advancing magnonic control methods.

Findings

Stimulated three-magnon splitting can be triggered below threshold.

Stimulation occurs over a wide range of powers and frequencies.

Experimental results align with theoretical predictions.

Abstract

We present a combined numerical, theoretical and experimental study on stimulated three-magnon splitting in a magnetic disk in the vortex equilibrium state. Our micromagnetic simulations and Brillouin-light-scattering results confirm that three-magnon splitting can be triggered even below threshold by exciting one of the secondary modes by magnons propagating in a waveguide next to the disk. The experiments show that stimulation is possible over an extended range of excitation powers and a wide range of frequencies around the eigenfrequencies of the secondary modes. Rate-equation calculations predict an instantaneous response to stimulation and the possibility to prematurely trigger three-magnon splitting even above threshold in a sustainable manner. These predictions are confirmed experimentally using time-resolved Brillouin-light-scattering measurements and are in a good qualitative agreement with the theoretical results. We believe that the controllable mechanism of stimulated three-magnon splitting could provide a possibility to utilize magnon-based nonlinear networks as hardware for reservoir or neuromorphic computing.