首页|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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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.
cut-off frequencypermeabilityeddy current effectsoft magnetic composites
金校伟、李通、史慧刚、薛德胜
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Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China111 Project
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