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Designing flexible magnetic materials for zero-magnetic-field operation of the anomalous Nernst effect.

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Title: Designing flexible magnetic materials for zero-magnetic-field operation of the anomalous Nernst effect.
Authors: Park, Sang J.1 (AUTHOR) PARK.SangJun@nims.go.jp, Modak, Rajkumar1 (AUTHOR), Gautam, Ravi1 (AUTHOR), Alasli, Abdulkareem2 (AUTHOR), Hirai, Takamasa1 (AUTHOR), Ando, Fuyuki1 (AUTHOR), Nagano, Hosei2 (AUTHOR), Sepehri-Amin, Hossein1 (AUTHOR), Uchida, Ken-ichi1,3 (AUTHOR) UCHIDA.Kenichi@nims.go.jp
Source: Acta Materialia. Dec2025, Vol. 301, pN.PAG-N.PAG. 1p.
Subjects: Nernst effect, Energy harvesting, Waste heat, Thermoelectric apparatus & appliances, Amorphous substances, Thermoelectric effects, Soft magnetic materials, Clean energy
Abstract: The global shift towards a carbon-neutral society has accelerated the demand for green energy, driving research into efficient technologies for harvesting energy from low-grade waste heat. Recently, transverse thermoelectrics based on the anomalous Nernst effect (ANE) has gained attention due to their simple device structure, scalability, and manufacturing-friendly nature. While topological single crystals and epitaxial films have been the focus for enhancing the ANE-driven thermoelectric performance, further improvements in material design are necessary for practical applications. Here, we report an easy-to-implement strategy for designing mechanically flexible transverse thermoelectric materials by creating amorphous-crystalline heterogeneous composites. We fabricated and optimized the heterogeneous composites through controlled heat treatment, achieving a significant enhancement of the anomalous Nernst coefficient, while maintaining flexibility. Additionally, the developed materials showed sufficiently large coercivity enabling operation of materials in devices under zero external magnetic field. Using the developed material, we constructed a single-material-based coiled device and demonstrated zero-field operation of the ANE-based energy harvesting from curved heat sources. These results validate the feasibility of using the ANE-based flexible materials for energy harvesting applications. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The global shift towards a carbon-neutral society has accelerated the demand for green energy, driving research into efficient technologies for harvesting energy from low-grade waste heat. Recently, transverse thermoelectrics based on the anomalous Nernst effect (ANE) has gained attention due to their simple device structure, scalability, and manufacturing-friendly nature. While topological single crystals and epitaxial films have been the focus for enhancing the ANE-driven thermoelectric performance, further improvements in material design are necessary for practical applications. Here, we report an easy-to-implement strategy for designing mechanically flexible transverse thermoelectric materials by creating amorphous-crystalline heterogeneous composites. We fabricated and optimized the heterogeneous composites through controlled heat treatment, achieving a significant enhancement of the anomalous Nernst coefficient, while maintaining flexibility. Additionally, the developed materials showed sufficiently large coercivity enabling operation of materials in devices under zero external magnetic field. Using the developed material, we constructed a single-material-based coiled device and demonstrated zero-field operation of the ANE-based energy harvesting from curved heat sources. These results validate the feasibility of using the ANE-based flexible materials for energy harvesting applications. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:13596454
DOI:10.1016/j.actamat.2025.121422