Stimulated magnon scattering by non-degenerate parametric excitation

TL;DR

This paper investigates stimulated magnon scattering in patterned micro- and nanostructures, revealing how non-degenerate parametric excitation can generate new magnon modes depending on geometry and pumping sequences.

Contribution

It demonstrates, via micromagnetic simulations, that combining two pumping frequencies induces stimulated magnon scattering, a process influenced by geometry and field sequence, in patterned structures.

Findings

Stimulated magnon scattering depends on film geometry.

Two pumping frequencies can generate new magnon modes.

Scattering channels differ from those in continuous films.

Abstract

Parametric spin wave excitation allows studying a variety of nonlinear phenomena, such as magnon scattering. In patterned micro- and nanostructures the magnon spectra is discrete and translational symmetry is broken, which means allowable scattering channels differ from those in continuous films. An example is non-degenerate scattering by which high-power transverse field pumping creates two magnons with distinct frequencies around half the pumping frequency. Through micromagnetics simulations, we show under certain conditions that combining two pumping frequencies generates new magnon modes through a process of stimulated magnon scattering. Such processes are found to depend on the film geometry and sequence of the pumping fields.