Creation of flexible spin-caloritronic material with giant transverse thermoelectric conversion by nanostructure engineering

Ravi Gautam, Takamasa Hirai, Abdulkareem Alasli, Hosei Nagano, Tadakatsu Ohkubo, Ken-ichi Uchida () and Hossein Sepehri-Amin ()
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Ravi Gautam: National Institute for Materials Science
Takamasa Hirai: National Institute for Materials Science
Abdulkareem Alasli: Nagoya University
Hosei Nagano: Nagoya University
Tadakatsu Ohkubo: National Institute for Materials Science
Ken-ichi Uchida: National Institute for Materials Science
Hossein Sepehri-Amin: National Institute for Materials Science

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract 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.

Date: 2024
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DOI: 10.1038/s41467-024-46475-6

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