Quantitative Analysis of High-Frequency Material Properties in Thin-Ribbon Magnetic Cores

This paper presents quantitative analysis of material properties of magnetic cores wound of thin magnetic tape. Self-consistent model of penetration depth was proposed to include skin effect in calculation of magnetic material parameters. The model was used to extract geometry-independent material parameters based on which quantitative analysis of the material complex permeability was presented. The model is based on the magnetic cores frequency-dependent complex impedance (measured) and on selected basic material parameters (typically provided by manufacturers). The approach is demonstrated on a practical example, in which frequency-dependent saturation current of the magnetic cores was calculated based on the extracted geometry-independent material parameters. The results are presented for three types of nanocrystalline cores, in a frequency range from 1 kHz to 100 MHz.