CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 26 February 2024
Revised: 14 May 2024
Accepted manuscript online: 13 June 2024
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PACS:
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75.40.Gb
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(Dynamic properties?)
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76.60.Jx
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(Effects of internal magnetic fields)
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75.50.Gg
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(Ferrimagnetics)
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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
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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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