Abstract

Soft magnetic composites (SMCs) are effective as magnetic powder cores in an inductor. Due to high saturation magnetization, large magnetocrystalline anisotropy and high operating frequency of M (metal)-RE (rear earth) soft magnetic composites, it is possible to miniaturize inductor cores by reducing total loss, especially eddy current loss and excess loss at high frequencies. In this article, the characteristics of Ce2Fe17N3/α-Fe (CFN/F) loss per volume and effective permeability reaching a high frequency of 3 MHz are investigated. The biphase CFN/F composite exhibits a high permeability of 16 at 70 MHz, which is two times greater than that of pure Ce2Fe17N3 (CFN) powders. The total loss is as low as 545 mW/cm3 at 3 MHz and 6 mT. The direct current (DC)-bias properties have a percent of permeability exceeding 65% at H = 7960 A/m. This phenomenon indicates that our material has a higher working frequency and lower core loss than other materials; the biphase CFN/F structure is a promising and efficient approach for developing the miniaturized radio frequency (RF) inductor core.

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