Anomalous Hall and Nernst effects in the Two-Dimensional ferromagnetic metal FePd2Te2

TL;DR

This study reports a giant zero-field anomalous Nernst effect in 2D ferromagnetic FePd2Te2, highlighting its potential for thermoelectric and spintronic applications due to its large thermoelectric response and Berry curvature contribution.

Contribution

The paper demonstrates a significant anomalous Nernst effect in a 2D ferromagnetic metal, revealing its potential for thermoelectric devices and advancing understanding of transverse thermoelectricity in layered magnets.

Findings

Maximum anomalous Nernst signal of 0.15 μV/K at 100 K

The ratio α_ij/σ_ij approaches the fundamental limit of 86 μV/K

Giant zero-field anomalous Nernst response observed in 2D FePd2Te2

Abstract

The transverse thermoelectric effect enables simpler, more flexible thermoelectric devices by generating electricity perpendicular to heat flow, offering promising solutions for waste heat recovery and solid-state cooling applications. Here, we report a striking observation of zero-field anomalous Hall effect (AHE) and anomalous Nernst effect (ANE) below TC in the two-dimensional metallic magnet FePd2Te2. The anomalous Nernst signal Syx^A peaks a maximum value of 0.15 {\mu}V/K at 100 K, much larger than that of conventional FM materials. Remarkably, the derived ratio alpha_ij/sigma_ij in FePd2Te2 approaches the fundamental limit of 86 {\mu}V/K. Our findings suggest a dominant Berry curvature contribution to the ANE. The observed giant zero-field anomalous Nernst response in 2D FePd2Te2 not only advances fundamental understanding of transverse thermoelectricity in layered magnets, but also provides this material as a promising candidate for practical thermoelectric spintronic applications.