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Chin. Phys. B, 2024, Vol. 33(9): 097501    DOI: 10.1088/1674-1056/ad57aa
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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
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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