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

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 (ANE), 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 improvement in the anomalous Nernst coefficients in flexible Fe-based amorphous materials through nanostructural engineering, without altering their composition. This surpasses all reported amorphous alloys and is comparable to single crystals showing large ANE. 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.

25 pages, 5 figures, 9 supplemental figures

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• Transverse thermoelectric generation using magnetic materials
• Thermoelectrics: from Longitudinal to Transverse
• Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
• Sm-Co-based amorphous alloy films for zero-field operation of transverse thermoelectric generation
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• Spintronic thermal management
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Cited by in corpus (5)

• Hybridizing anomalous Nernst effect in artificially tilted multilayer based on magnetic topological material
• Fundamentals and advances in transverse thermoelectrics
• Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets
• High-throughput development of flexible amorphous materials showing large anomalous Nernst effect via automatic annealing and thermoelectric imaging
• Designing flexible hard magnetic materials for zero-magnetic-field operation of the anomalous Nernst effect