Spin Peltier effect and its length scale in Pt/YIG system at high temperatures

TL;DR

This study investigates the temperature and thickness dependence of the spin Peltier effect in Pt/YIG systems, revealing a consistent characteristic length and differences from the spin Seebeck effect at high temperatures.

Contribution

It provides the first detailed analysis of the SPE length scale across a range of temperatures in Pt/YIG systems, highlighting its temperature independence and relation to the spin Seebeck effect.

Findings

Characteristic length of SPE is about 0.9 μm near room temperature.

SPE behavior at high temperatures differs from the spin Seebeck effect.

SPE length scale remains almost constant up to the Curie temperature.

Abstract

The temperature and yttrium-iron-garnet (YIG) thickness dependences of the spin Peltier effect (SPE) have been investigated using a Pt/YIG junction system at temperatures ranging from room temperature to the Curie temperature of YIG by the lock-in thermography method. By analyzing the YIG thickness dependence using an exponential decay model, the characteristic length of SPE in YIG is estimated to be 0.9 $\mu$m near room temperature and almost constant even near the Curie temperature. The high-temperature behavior of SPE is clearly different from that of the spin Seebeck effect, providing a clue for microscopically understanding the reciprocal relation between them.