Thermoelectric performance of spin Seebeck effect in Fe3O4/Pt-based thin film heterostructures

TL;DR

This paper systematically investigates the thermoelectric performance of Fe3O4/Pt-based spin Seebeck devices, demonstrating that multilayer structures enhance power output by increasing thermoelectric voltage and reducing internal resistance.

Contribution

It introduces multilayer structures as a novel approach to improve the thermoelectric efficiency of spin Seebeck devices, overcoming limitations of single-layer geometries.

Findings

Multilayer structures increase thermoelectric voltage.

Multilayers reduce internal resistance.

Power output is significantly enhanced in multilayer devices.

Abstract

We report a systematic study on the thermoelectric performance of spin Seebeck devices based on Fe3O4/Pt junction systems. We explore two types of device geometries: a spin Hall thermopile and spin Seebeck multilayer structures. The spin Hall thermopile increases the sensitivity of the spin Seebeck effect, while the increase in the sample internal resistance has a detrimental effect on the output power. We found that the spin Seebeck multilayers can overcome this limitation since the multilayers exhibit the enhancement of the thermoelectric voltage and the reduction of the internal resistance simultaneously, therefore resulting in significant power enhancement. This result demonstrates that the multilayer structures are useful for improving the thermoelectric performance of the spin Seebeck effect.