Improved magnetic properties in amorphous FeSiBCr soft magnetic composites with easy-plane anisotropy for high-frequency applications

Abstract

Abstract The miniaturization and high frequency of future electromagnetic devices require soft magnetic composites with high permeability, high working frequency, and low core loss. In this work, easy-plane amorphous FeSiBCr powders with a thickness of approximately 1–2 μm are obtained by planetary ball milling, and are successfully fabricated into an arranged soft magnetic composite by using a uniform magnetic field. The complex permeability spectrums of the composites are measured and analyzed. Due to the planar distribution of easy magnetization axes, the amorphous easy-plane FeSiBCr/Si-resin composite shows a permeability of 31 at 1 MHz. The core loss of the samples is measured from 100 KHz to 5 MHz and is discussed in detail. The loss-separated results illustrate that the eddy current loss and excess loss can be effectively reduced in the amorphous easy-plane FeSiBCr/Si-resin composite. These results indicate that, compared with an amorphous non-easy-plane FeSiBCr/Si-resin composite, the permeability of the amorphous easy-plane FeSiBCr/Si-resin composite is effectively improved and the core loss is reduced, making it promising for high-frequency applications.