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

doi:10.1088/1674-1056/ad57aa

中国物理B ›› 2024, Vol. 33 ›› Issue (9): 97501-097501.doi: 10.1088/1674-1056/ad57aa

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

Xiao-Wei Jin(金校伟), Tong Li(李通), Hui-Gang Shi(史慧刚), and De-Sheng Xue(薛德胜)†

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

收稿日期:2024-02-26 修回日期:2024-05-14 接受日期:2024-06-13 发布日期:2024-08-15
通讯作者: De-Sheng Xue E-mail:xueds@lzu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91963201 and 12174163) and the 111 Project (Grant No. B20063).

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

Xiao-Wei Jin(金校伟), Tong Li(李通), Hui-Gang Shi(史慧刚), and De-Sheng Xue(薛德胜)†

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

Received:2024-02-26 Revised:2024-05-14 Accepted:2024-06-13 Published:2024-08-15
Contact: De-Sheng Xue E-mail:xueds@lzu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 91963201 and 12174163) and the 111 Project (Grant No. B20063).

摘要/Abstract

摘要： 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.

关键词: cut-off frequency, permeability, eddy current effect, soft magnetic composites

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.

Key words: cut-off frequency, permeability, eddy current effect, soft magnetic composites

中图分类号: (Dynamic properties?)

75.40.Gb

76.60.Jx (Effects of internal magnetic fields) 75.50.Gg (Ferrimagnetics)

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[J]. 中国物理B, 2024, 33(9): 97501-097501.

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[J]. Chin. Phys. B, 2024, 33(9): 97501-097501.

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

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

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