Probing of a parametrically pumped magnon gas with a non-resonant packet of traveling spin waves

TL;DR

This paper investigates how a non-resonant traveling spin wave packet interacts with a parametrically pumped magnon gas in a YIG film, revealing properties of the magnon gas through amplitude and phase analysis.

Contribution

It introduces a simple theoretical model to determine magnon density in the pumped region based on spin wave interactions.

Findings

Magnon gas affects the amplitude and phase of traveling spin waves.

Theoretical model accurately estimates magnon density.

Probing method provides insights into magnon gas properties.

Abstract

The magnon gas created by spatially localized longitudinal parametric pumping in an yttrium-iron-garnet film is probed by a traveling packet of spin waves non-resonant with the pumping field. The analysis of the influence of the magnon gas on the amplitude and phase of the propagating spin waves allows to determine characteristic properties of the parametrically pumped magnon gas. A simple theoretical model is proposed from which the magnon density in the pumping region is calculated.