Article Non-Equilibrium Magnon Engineering Enabling Significant Thermal Transport Modulation

Takamasa Hirai SAMURAI ORCID ; Toshiaki Morita ; Subrata Biswas ; Jun Uzuhashi SAMURAI ORCID ; Takashi Yagi ORCID ; Yuichiro Yamashita ORCID ; Varun Kumar Kushwaha ; Fuya Makino ; Rajkumar Modak ; Yuya Sakuraba SAMURAI ORCID ; Tadakatsu Ohkubo SAMURAI ORCID ; Rulei Guo ; Bin Xu ; Junichiro Shiomi ORCID ; Daichi Chiba ORCID ; Ken-ichi Uchida SAMURAI ORCID

Adv Funct Materials - 2025 - Hirai - Non-Equilibrium Magnon Engineering Enabling Significant Thermal Transport Modulation.pdf
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Takamasa Hirai, Toshiaki Morita, Subrata Biswas, Jun Uzuhashi, Takashi Yagi, Yuichiro Yamashita, Varun Kumar Kushwaha, Fuya Makino, Rajkumar Modak, Yuya Sakuraba, Tadakatsu Ohkubo, Rulei Guo, Bin Xu, Junichiro Shiomi, Daichi Chiba, Ken-ichi Uchida. Non-Equilibrium Magnon Engineering Enabling Significant Thermal Transport Modulation. Advanced Functional Materials. 2025, 35 (40), 2506554. https://doi.org/10.1002/adfm.202506554

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(abstract)

Thermal conductivity, a fundamental parameter characterizing thermal transport in solids, is typically determined by electron and phonon transport. Although electrical transport properties are material-specific, recent advance in understanding phonon transport has led to new insights on controlling the thermal conductivity via phonon engineering techniques. Here, an unconventional way of artificially modulating the heat conduction in solids is demonstrated via engineering of magnon transport. Time-domain thermoreflectance measurements in ferromagnetic metal/insulator junction systems reveal that the thermal conductivity of the ferromagnetic metals and interfacial thermal conductance vary substantially depending on the spatial distribution of non-equilibrium spin currents. Systematic measurements of the thermal transport properties with changing the boundary conditions for spin currents unveil that magnons significantly modulate the heat conduction by ~10 W/mK even in ferromagnetic metals at room temperature, upsetting the conventional wisdom that the magnon thermal conductivity is very small in metals except at low temperatures. This magnon-engineered thermal transport offers a new principle and manner for active thermal management.

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Keyword: Magnon engineering, Thermal conductivity, Interfacial thermal resistance, Time-domain thermoreflectance

Date published: 2025-10-01

Publisher: Wiley

Journal:

  • Advanced Functional Materials (ISSN: 1616301X) vol. 35 issue. 40 2506554

Funding:

  • Thermal and Electric Energy Technology Foundation
  • NEC Corporation
  • Japan Society for the Promotion of Science 22H04965
  • Japan Society for the Promotion of Science 22K20495
  • Exploratory Research for Advanced Technology JPMJER2201
  • Core Research for Evolutional Science and Technology JPMJCR17I1

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

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First published URL: https://doi.org/10.1002/adfm.202506554

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Updated at: 2025-10-21 15:49:59 +0900

Published on MDR: 2025-10-21 15:43:47 +0900

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