MHz mechanism of permeability in Fe-Si-Al soft magnetic composites

被引：0
|
作者：
Feng, Hao [1 ]
Jin, Xiaowei [1 ]
Li, Tong [1 ]
Cui, Hongxin [1 ]
Meng, Chao [1 ]
Liu, Zhaochen [1 ]
Xue, Desheng [1 ,2 ]
机构：
[1] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Peoples R China
[2] Lanzhou Univ, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2025年 / 1014卷
关键词：
Permeability; Cut-off frequency; Loss; Eddy current; MHz; Soft magnetic composites; POWDER CORES; FIELD; EVOLUTION; LOSSES;
D O I：
10.1016/j.jallcom.2025.178742
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
MHz mechanism of permeability in soft magnetic composites (SMCs) based on epoxy-coated spherical Fe-Si-Al particles is studied. It is found the permeability at 1 MHz decreases from 23 (+0.69) to 10 (+0.3) and the cut-off frequency of permeability increases from 126 (+3.78) MHz to over 1 GHz with decreasing the volume fraction of particles in the SMCs from 90 % to 60 %, respectively. Combining with the results of ferromagnetic resonance, coherent rotation of domain modulated by eddy current is the dominated MHz mechanism of permeability. This is corresponding to both increase of cut-off frequency (from 31 (+0.9) MHz to 367 (+11) MHz) and decrease of loss (from 6776 (+379) kW m-3 to 1003 (+56) kW m-3 at 3 MHz) of SMCs with decreasing the average particle sizes (from 96.0 mu m to 9.3 mu m). This study deepens the understanding of the permeability of SMCs in the MHz band, and provides a reference for the design of high frequency power electronics.
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页数：6
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