Spin wave amplification driven by heat flow: the role of damping and exchange interaction

TL;DR

This study demonstrates through micromagnetic simulations that heat flow can effectively compensate damping in permalloy nanostructures, leading to spin-wave amplification influenced by damping and exchange interactions.

Contribution

The paper introduces the concept of using heat flow to amplify spin waves in nanostructures, highlighting the role of damping and exchange interactions in this process.

Findings

Heat flow can compensate damping in permalloy nanostructures.

Spin-wave amplification occurs at experimentally accessible thermal gradients.

The Gilbert damping parameter significantly influences amplification effectiveness.

Abstract

In this article we report on micromagnetic simulations performed on a permalloy nanostructure in presence of a uniform thermal gradient. Our numerical simulations show that heat flow is an effective mean to compensate the damping, and that the gradients at which spin-wave amplification is observed are experimentally accessible. In particular, we have studied the role of the Gilbert damping parameter on spin-wave amplification.