Large anomalous Nernst effect across the magneto-structural transition in bulk Ni-Co-Mn-Sn full Heusler alloy

TL;DR

This paper reports a significant change in the anomalous Nernst effect across a magneto-structural transition in Ni-Co-Mn-Sn Heusler alloy, highlighting potential for temperature and magnetic field-controlled switching applications.

Contribution

It demonstrates a large, temperature-dependent anomalous Nernst effect in Ni-Co-Mn-Sn alloy during a first-order magnetostructural transition, a novel observation in this material.

Findings

Large change in Nernst coefficient across transition

Dependence of ANE on magnetic anisotropy

Potential for temperature and field-controlled switching

Abstract

We report on the observation of temperature and field dependent anomalous Nernst effect (ANE) in Ni-rich bulk Ni-Co-Mn-Sn full Heusler alloy. A large change in the transverse Nernst coefficient (N) is obtained across the first order magnetostructural transition from a tetragonal martensite to a cubic austenite phase. The saturation of ANE and magnetic data appear to depend largely on the magnetic anisotropy of the device. Such change in the Nernst co-efficient may prove to be useful for switching applications controlled by temperature and magnetic field changes.