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Functional materials such as magnetic, thermoelectric, and battery materials
have been revolutionized through nanostructure engineering. However, spin
caloritronics, an advancing field based on spintronics and thermoelectrics with
fundamental physics studies, has focused only on uniform materials without
complex microstructures. Here, we show how nanostructure engineering
enables transforming simple magnetic alloys into spin-caloritronic materials
displaying significantly large transverse thermoelectric conversion properties.
The anomalous Nernst effect, a promising transverse thermoelectric phenomenon for energy harvesting and heat sensing, has been challenging to
utilize due to the scarcity of materials with large anomalous Nernst coefficients. We demonstrate a remarkable ~ 70% improvement in the anomalous
Nernst coefficients (reaching ~ 3.7 µVK−1) and a significant ~ 200% enhancement
in the power factor (reaching ~ 7.7 µWm−1K−2) in flexible Fe-based amorphous
materials by nanostructure engineering without changing their composition.
This surpasses all reported amorphous alloys and is comparable to single
crystals showing large anomalous Nernst effect. The enhancement is attributed to Cu nano-clustering, facilitating efficient transverse thermoelectric
conversion. This discovery advances the materials science of spin caloritronics, opening new avenues for designing high-performance transverse
thermoelectric devices for practical applications

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: spin-caloritronic , Nanostructure, Anomalous Nernst effect , transverse thermoelectric conversion

Date published: 2024-03-27

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 2184

Funding:

• MEXT | JST | Exploratory Research for Advanced Technology JPMJER2201

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-024-46475-6

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Updated at: 2024-11-11 16:30:30 +0900

Published on MDR: 2024-11-11 16:30:30 +0900