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Description:

The next generation of power electronics requires materials with rapid response at tens of kilohertz while minimizing core losses. Progress is limited by the shortage of ultra-low-loss soft magnets. We demonstrate a nanostructure-engineering approach with high-frequency domain control that boosts Fe-enriched amorphous ribbons, cutting core loss by 55% to ~75 ± 1.3 W/kg at 10 kHz, 1 T. This arises from optimized perpendicular anisotropy induced by positive magnetostriction and compressive stress from partial nanocrystallization of α-Fe in an amorphous matrix. The resulting narrow stripe-shaped domains (~4.8 ± 0.6 μm) suppress excess loss. Our findings mark a key step in soft magnet design, enabling energy-efficient, miniaturized power electronics.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Soft magnet, Core loss, Magnetic domain, Nanostructure

Date published: 2025-09-03

Publisher: Springer Science and Business Media LLC

Journal:

• Nature Communications (ISSN: 20411723) vol. 16 issue. 1 8022

Funding:

• INNOPEL

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

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-025-63139-1

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Updated at: 2025-09-30 12:30:25 +0900

Published on MDR: 2025-09-30 12:18:38 +0900