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<p>Novel Fe-based nanocrystalline soft magnetic composites (SMCs) are prepared using a cold pressing method with Fe<sub>73.3</sub>P<sub>5</sub>Si<sub>7.6</sub>B<sub>9.5</sub>C<sub>1.9</sub>Nb<sub>2</sub>Cu<sub>0.7</sub> powder and carbonyl iron powder (CIP). This work systematically explores the effect of adding CIP on both the microstructural development and the enhancement of soft magnetic performance. The optimized SMCs containing 15 wt.% CIP exhibit the most desirable soft magnetic properties subjected to appropriate heat treatment. Compared to its CIP-free core, the saturation magnetization (<i>M</i><sub>s</sub>) increases from 138&#xa0;emu/g to 155&#xa0;emu/g, and the effective permeability (<i>μ</i><sub>e</sub>) rises from 45 to 53.6. The DC-bias characteristics reach 63% at 100 Oe, and the core loss (<i>P</i><sub>cv</sub>) decreases by ~ 20% to as low as 178 mW/cm<sup>3</sup> (0.05&#xa0;T, 100&#xa0;kHz). The improvement arises from CIP-induced densification that suppresses porosity and reduces domain-wall pinning. This unique combination of high permeability, robust DC-bias characteristics, and low core loss highlights the promise of CIP-doped nanocrystalline SMCs for high-current applications in advanced electronic and power devices.</p>

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Optimizing the high-frequency magnetic properties of Fe-based nanocrystalline soft magnetic composites by incorporating carbonyl iron powder

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Changlong Jin,
  • Yanzhou Fan,
  • Xingyu Zheng,
  • Min Wang,
  • Jifeng Zhou,
  • Qiang Luo,
  • Zhijun Guo,
  • Baolong Shen

摘要

Novel Fe-based nanocrystalline soft magnetic composites (SMCs) are prepared using a cold pressing method with Fe73.3P5Si7.6B9.5C1.9Nb2Cu0.7 powder and carbonyl iron powder (CIP). This work systematically explores the effect of adding CIP on both the microstructural development and the enhancement of soft magnetic performance. The optimized SMCs containing 15 wt.% CIP exhibit the most desirable soft magnetic properties subjected to appropriate heat treatment. Compared to its CIP-free core, the saturation magnetization (Ms) increases from 138 emu/g to 155 emu/g, and the effective permeability (μe) rises from 45 to 53.6. The DC-bias characteristics reach 63% at 100 Oe, and the core loss (Pcv) decreases by ~ 20% to as low as 178 mW/cm3 (0.05 T, 100 kHz). The improvement arises from CIP-induced densification that suppresses porosity and reduces domain-wall pinning. This unique combination of high permeability, robust DC-bias characteristics, and low core loss highlights the promise of CIP-doped nanocrystalline SMCs for high-current applications in advanced electronic and power devices.