# Thermal induced monochromatic microwave generation in magnon-polariton

## TL;DR

This paper introduces a novel method for generating monochromatic microwave radiation through thermal energy in magnon-polaritons, utilizing negative damping and exceptional point physics to achieve efficient energy conversion.

## Contribution

It presents a new thermal-to-microwave energy conversion mechanism in magnon-polaritons based on intrinsic energy loss compensation and exceptional point physics.

## Key findings

- Achieves up to 17% efficiency in thermal to microwave energy conversion.
- Demonstrates the role of negative damping and exceptional points in energy transfer.
- Proposes a new mechanism for microwave generation using thermal energy.

## Abstract

We propose thermal induced generation of monochromatic microwave radiation in magnon-polariton. Mechanism of thermal to microwave energy transformation is based on intrinsic energy loss compensation of coupled magnon and microwave cavity oscillators by thermal induced "negative damping". A singularity at an exceptional point is achieved when at the critical value of "negative damping" the damping of the system is fully compensated. At the exceptional point, the input energy is equally distributed between the magnon and photon subsystems of the magnon-polariton. The efficiency of transformation of thermal energy into useful microwave radiation is estimated to be as large as 17 percent due to magnon-photon coupling mediated direct conversation of spin current into microwave photons.