Interface-induced anomalous Nernst effect in Fe3O4/Pt-based heterostructures

TL;DR

This study investigates the anomalous Nernst effect in Fe3O4/Pt heterostructures, revealing an interface-induced ANE and highlighting the dominance of the spin Seebeck effect in transverse thermoelectric voltage.

Contribution

It demonstrates the presence of an interface-induced ANE in Fe3O4/Pt heterostructures and distinguishes its contribution from the spin Seebeck effect.

Findings

Interface-induced ANE observed in multilayers.

Spin Seebeck effect accounts for ~70% of voltage.

Pt thickness influences ANE characteristics.

Abstract

We have studied the anomalous Nernst effect (ANE) in [Fe3O4/Pt]-based heterostructures, by measuring the ANE-induced electric field with a magnetic field applied normal to the sample surface, in the perpendicular magnetized configuration, where only the ANE is expected. An ANE voltage is observed for [Fe3O4/Pt]n multilayers, and we further investigated its origin by performing measurements in [Fe3O4/Pt/Fe3O4] trilayers as a function of the Pt thickness. Our results suggest the presence of an interface-induced ANE. Despite of this ANE, the spin Seebeck effect is the dominant mechanism for the transverse thermoelectric voltage in the in-plane magnetized configuration, accounting for about 70 % of the measured voltage in the multilayers.