Seebeck-driven transverse thermoelectric generation in magnetic hybrid bulk materials

TL;DR

This study demonstrates that magnetic/thermoelectric hybrid bulk materials can generate significant transverse thermoelectric voltage via Seebeck-driven effects, showing promise for thermal energy harvesting applications.

Contribution

First demonstration of Seebeck-driven transverse thermoelectric generation in bulk magnetic/thermoelectric hybrid materials, highlighting their potential for efficient thermal energy harvesting.

Findings

Transverse thermopower reaches 16.0 μV/K at room temperature.

Hybrid bulk materials exhibit larger electrical power due to low internal resistance.

STTG effect confirmed as viable in bulk materials for thermoelectric applications.

Abstract

The Seebeck-driven transverse thermoelectric generation in magnetic/thermoelectric hybrid materials (STTG) has been investigated in all-bulk hybrid materials. The transverse thermopower in a ferromagnetic Co$_2$MnGa/thermoelectric $n$-type Si hybrid bulk material with the adjusted dimensions reaches 16.0 $\mu$V/K at room temperature with the aid of the STTG contribution, which is much larger than the anomalous Nernst coefficient of the Co$_2$MnGa slab (6.8 $\mu$V/K). Although this transverse thermopower is smaller than the value for previously reported thin-film-based hybrid materials, the hybrid bulk materials exhibit much larger electrical power owing to their small internal resistance. This demonstration confirms the validity of STTG in bulk materials and clarifies its potential as a thermal energy harvester.