High-temperature dependence of anomalous Ettingshausen effect in SmCo$_5$-type permanent magnets

TL;DR

This study explores how the anomalous Ettingshausen effect in SmCo$_5$-type magnets varies with temperature up to 600 K, revealing a significant increase in the effect and potential for high-temperature thermoelectric applications.

Contribution

The paper provides the first high-temperature analysis of AEE in SmCo$_5$ magnets, combining experimental measurements with first-principles calculations to understand its temperature dependence.

Findings

AEE coefficient increases monotonically with temperature.

AEE figure of merit exceeds previous records for Nernst effect.

First-principles calculations support the observed temperature dependence.

Abstract

The anomalous Ettingshausen effect (AEE) in SmCo$_5$-type permanent magnets has been investigated in the high-temperature range from room temperature to around 600 K. The anomalous Ettingshausen coefficient of the SmCo$_5$ and (SmGd)Co$_5$ magnets monotonically increases with increasing the temperature and shows the similar temperature dependence, while the coefficient of SmCo$_5$ is slightly larger than that of (SmGd)Co$_5$ at high temperatures. The dimensionless figure of merit for AEE in SmCo$_5$ at high temperatures is much greater than the previous record obtained for the anomalous Nernst effect. The observed high-temperature behavior of AEE is discussed based on the first-principles calculations of transverse transport coefficients.