Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect

Fuyuki Ando; Takamasa Hirai; K Uchida

doi:10.1063/5.0180506

journal article Open Access Jan 23, 2024

Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect

Fuyuki Ando

Takamasa Hirai

K Uchida

APL Energy Vol. 2 No. 1 · AIP Publishing

View at Publisher Save 10.1063/5.0180506

Abstract

A transverse thermoelectric generator for magnetic-field-free and high-density power generation utilizing the anomalous Nernst effect is constructed and its performance is characterized. By alternately stacking two different permanent magnets with the large coercivity and anomalous Nernst coefficients of opposite sign, transverse thermoelectric voltage and power can be generated in the absence of external magnetic fields and enhanced owing to a thermopile structure without useless electrode layers. In the permanent-magnet-based stack, the magnetic attractive force enables easy construction of the thermopile structure with a high fill factor. In this study, we construct a bulk module consisting of 12 pairs of SmCo5- and Nd2Fe14B-type permanent magnets having positive and negative anomalous Nernst coefficients, respectively, whose fill factor reaches ∼80%, whereas that of conventional thermoelectric modules based on the Seebeck effect is typically 30%–60%. We demonstrate magnetic-field-free anomalous Nernst power generation up to 177 µW at a temperature difference of 75 K around room temperature, which corresponds to the largest anomalous Nernst power density of 65 µW/cm2. The presented module structure concept will provide a design guideline for high-performance transverse thermoelectric power generation.

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Cited By

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Fundamentals and advances in transverse thermoelectrics

Hiroto Adachi, Fuyuki Ando · 2025

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Metrics

18

Citations

35

References

Details

Published: Jan 23, 2024
Vol/Issue: 2(1)
License: View

Authors

F

Fuyuki Ando

National Institute for Materials Science , Tsukuba 305-0047, Japan

T

Takamasa Hirai

National Institute for Materials Science , Tsukuba 305-0047, Japan

K

K Uchida

National Institute for Materials Science , Tsukuba 305-0047, Japan

Funding

NEC Corporation

Exploratory Research for Advanced Technology (ERATO) "Magnetic Thermal Management Materials" Award: JPMJER2201

Cite This Article

Fuyuki Ando, Takamasa Hirai, K Uchida (2024). Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect. APL Energy, 2(1). https://doi.org/10.1063/5.0180506

Permanent-magnet-based transverse thermoelectric generator with high fill factor driven by anomalous Nernst effect

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