Vortex-based soft magnetic composite with ultrastable permeability up to gigahertz frequencies

Guohua Bai, Jiayi Sun, Zhenhua Zhang, Xiaolian Liu, Sateesh Bandaru, Weiwei Liu, Zhong Li, Hongxia Li, Ningning Wang and Xuefeng Zhang ()
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Guohua Bai: Hangzhou Dianzi University
Jiayi Sun: Hangzhou Dianzi University
Zhenhua Zhang: Hangzhou Dianzi University
Xiaolian Liu: Hangzhou Dianzi University
Sateesh Bandaru: Hangzhou Dianzi University
Weiwei Liu: Hangzhou Dianzi University
Zhong Li: Hangzhou Dianzi University
Hongxia Li: Hangzhou Dianzi University
Ningning Wang: Hangzhou Dianzi University
Xuefeng Zhang: Hangzhou Dianzi University

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

Abstract: Abstract Soft magnetic materials with stable permeability up to hundreds of megahertz (MHz) are urgently needed for integrated transformers and inductors, which are crucial in the more-than-Moore era. However, traditional frequency-stable soft magnetic ferrites suffer from low saturation magnetization and temperature instability, making them unsuitable for integrated circuits. Herein, we fabricate a frequency-stable soft magnetic composite featuring a magnetic vortex structure via cold-sintering, where ultrafine FeSiAl particles are magnetically isolated and covalently bonded by Al2SiO5/SiO2/Fe2(MoO4)3 multilayered heterostructure. This construction results in an ultrastable permeability of 13 up to 1 gigahertz (GHz), relatively large saturation magnetization of 105 Am2/kg and low coercivity of 48 A/m, which we ascribe to the elimination of domain walls associated with almost uniform single-vortex structures, as observed by Lorentz transmission electron microscopy and reconstructed by micromagnetic simulation. Moreover, the ultimate compressive strength has been simultaneously increased up to 337.1 MPa attributed to the epitaxially grown interfaces between particles. This study deepens our understanding on the characteristics of magnetic vortices and provides alternative concept for designing integrated magnetic devices.

Date: 2024
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DOI: 10.1038/s41467-024-46650-9

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