Anomalous Nernst effect in amorphous Tb-Fe-Co thin films

TL;DR

This study investigates how the anomalous Nernst effect varies with composition in amorphous Tb-Fe-Co thin films, revealing controllable thermoelectric properties influenced by electronic states and Berry curvature.

Contribution

It demonstrates the compositional dependence of the ANE in amorphous Tb-Fe-Co films and clarifies the contributions of different thermoelectric effects to the maximum ANE coefficient.

Findings

Maximum ANE coefficient of 1.8 uV/K at specific composition.

ANEC varies significantly with transition metal composition.

Electronic states and Berry curvature influence thermoelectric properties.

Abstract

We conducted a comprehensive study on the compositional dependence of the anomalous Nernst effect (ANE) in amorphous (amo.) Tb-Fe-Co thin films. The anomalous Nernst coefficient strongly depends not only on the Tb composition but also on the transition metal composition, reaching a maximum of 1.8 uV/K for amo. Tb11.0(Fe50.0Co50.0) 89.0. By evaluating the electrical and thermoelectric properties, it was clarified that this maximum is achieved by the superposition of two large contributions: S_1 arising from direct transverse electron conduction due to a temperature gradient, and S_2 resulting from the combined Seebeck and anomalous Hall effects. We discovered that the anomalous Nernst conductivity, which is attributed to Berry curvature, varied significantly with the transition metal, even in an amorphous material lacking long-range crystalline order. Our research indicates that it is possible to control the electronic states that influence thermoelectric properties, even in the amorphous state.