# Thickness dependence of spin Peltier effect visualized by thermal imaging technique

## TL;DR

This study visualizes how the spin Peltier effect varies with YIG thickness using thermal imaging, providing insights into magnon propagation and validating models for magnon diffusion length estimation.

## Contribution

It introduces a thermal imaging method to measure the thickness dependence of the spin Peltier effect in YIG, enabling precise analysis of magnon propagation.

## Key findings

- Confirmed the t_YIG dependence of SPE with high resolution.
- Validated phenomenological models for magnon diffusion length.
- Demonstrated the effectiveness of lock-in thermography in spin caloritronics.

## Abstract

Magnon propagation length in a ferrimagnetic insulator yttrium iron garnet (YIG) has been investigated by measuring and analyzing the YIG-thickness t_YIG dependence of the spin Peltier effect (SPE) in a Pt/YIG junction system. By means of the lock-in thermography technique, we measured the spatial distribution of the SPE-induced temperature modulation in the Pt/YIG system with the t_YIG gradation, allowing us to obtain the accurate t_YIG dependence of SPE with high t_YIG resolution. Based on the t_YIG dependence of SPE, we verified the applicability of several phenomenological models to estimate the magnon diffusion length in YIG.