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<p>FeSiBNbCu nanocrystalline powder cores exhibit strong potential for molding choke applications; however, their high hardness results in low compactness of their soft magnetic composites, limiting their high-frequency magnetic properties. In this study, a significant improvement in the high-frequency magnetic properties of soft magnetic composites (SMCs) was achieved by incorporating small-sized carbonyl iron powder (CIP), and the loss mechanism was investigated through the analysis of high-frequency core loss separation. FeSiBNbCu/CIP-20 wt.% SMCs exhibit excellent magnetic properties with a low core loss of 773.86 mW/cm<sup>3</sup> at 20 mT/2000&#xa0;kHz, a high <i>B</i>s of 0.9&#xa0;T, a DC bias performance of 85% at an applied field of 100 Oe, and a permeability of 21.4 under 5&#xa0;MHz. The core loss separation indicated that the SMCs with 20 wt.% CIP significantly reduces excess loss at 20 mT/2000&#xa0;kHz by 78.0%, while the hysteresis loss and eddy current loss increase slightly. CIP forms an enhanced phase akin to “magnetic filler” in the composite system and optimizes structural uniformity, which results in the lowest core loss in the FeSiBNbCu/CIP SMCs. This demonstrates that this compounding strategy offers a valuable technical exploration path for optimizing the performance of soft magnetic composites in high-frequency electromagnetic equipment.</p>

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Investigation on High-Frequency Magnetic Properties and Loss Contribution Analysis of FeSiBNbCu/CIP Soft Magnetic Composites

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Mengyang Cai,
  • Xingjie Jia,
  • Yaqiang Dong,
  • Ling Zhang,
  • Huan Chen,
  • Aina He,
  • Jiawei Li,
  • Qikui Man,
  • Baogen Shen

摘要

FeSiBNbCu nanocrystalline powder cores exhibit strong potential for molding choke applications; however, their high hardness results in low compactness of their soft magnetic composites, limiting their high-frequency magnetic properties. In this study, a significant improvement in the high-frequency magnetic properties of soft magnetic composites (SMCs) was achieved by incorporating small-sized carbonyl iron powder (CIP), and the loss mechanism was investigated through the analysis of high-frequency core loss separation. FeSiBNbCu/CIP-20 wt.% SMCs exhibit excellent magnetic properties with a low core loss of 773.86 mW/cm3 at 20 mT/2000 kHz, a high Bs of 0.9 T, a DC bias performance of 85% at an applied field of 100 Oe, and a permeability of 21.4 under 5 MHz. The core loss separation indicated that the SMCs with 20 wt.% CIP significantly reduces excess loss at 20 mT/2000 kHz by 78.0%, while the hysteresis loss and eddy current loss increase slightly. CIP forms an enhanced phase akin to “magnetic filler” in the composite system and optimizes structural uniformity, which results in the lowest core loss in the FeSiBNbCu/CIP SMCs. This demonstrates that this compounding strategy offers a valuable technical exploration path for optimizing the performance of soft magnetic composites in high-frequency electromagnetic equipment.