MHz cut-off frequency and permeability mechanism of iron-based soft magnetic composites

doi:10.1088/1674-1056/ad57aa

Abstract The lack of soft magnetic composites with high power density in MHz frequency range has become an obstacle in the efficient operation of the electrical and electronic equipments. Here, a promising method to increase the cut-off frequency of iron-based soft magnetic composites to hundreds of MHz is reported. The cut-off frequency is increased from 10 MHz to 1 GHz by modulating the height of the ring, the distribution of particles, and the particle size. The mechanism of cut-off frequency and permeability is the coherent rotation of domain modulated by inhomogeneous field due to the eddy current effect. An empirical formula for the cut-off frequency in a magnetic ring composed of iron-based particles is established from experimental data. This work provides an effective approach to fabricate soft magnetic composites with a cut-off frequency in hundreds of MHz.

Keywords: cut-off frequency permeability eddy current effect soft magnetic composites

Received: 26 February 2024
Revised: 14 May 2024
Accepted manuscript online: 13 June 2024

PACS:	75.40.Gb	(Dynamic properties?)
	76.60.Jx	(Effects of internal magnetic fields)
	75.50.Gg	(Ferrimagnetics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91963201 and 12174163) and the 111 Project (Grant No. B20063).

Corresponding Authors: De-Sheng Xue
E-mail: xueds@lzu.edu.cn

Cite this article:

Xiao-Wei Jin(金校伟), Tong Li(李通), Hui-Gang Shi(史慧刚), and De-Sheng Xue(薛德胜) MHz cut-off frequency and permeability mechanism of iron-based soft magnetic composites 2024 Chin. Phys. B 33 097501

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MHz cut-off frequency and permeability mechanism of iron-based soft magnetic composites

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