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<p>This study successfully fabricated the Fe<sub>72</sub>Si<sub>16</sub>B<sub>7</sub>Cu<sub>1</sub>Nb<sub>4</sub> iron-based amorphous alloy via melt-spinning and systematically investigated structural relaxation, magnetic domain structure evolution, and their impact on coercivity through precisely controlled multi-step annealing at primary annealing temperatures (510 , 520 , 530 , and 540&#xa0;°C). The results reveal that as the annealing temperature increased from 510&#xa0;°C to 540&#xa0;°C, the volume fraction of the crystalline phase significantly increased from 59.53 to 71.43%, while the thickness of the residual amorphous layer decreased noticeably from 1.987 to 1.673&#xa0;nm. Furthermore, the annealing treatment led to a substantial enhancement in the alloy’s saturation magnetic induction from 0.597 to 1.120&#xa0;T, and a dramatic reduction in coercivity from 15.623 to 0.298&#xa0;A/m. This research elucidates the critical role of enhanced atomic mobility, atomic rearrangement, and elimination of free volume in optimizing the magnetic domain structure and improving soft magnetic properties. This study provides valuable guidance for the design of high-sensitivity magnetic cores in power electronics, such as residual current protection devices, by optimizing coercivity through controlled annealing.</p>

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The Influence of Structural State on the Coercivity of Fe72Si16B7Cu1Nb4 Nanocrystalline Alloys

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Jiashao Shao,
  • Wenju Gu,
  • Li Li,
  • Xiucong Yao,
  • Yanfei Geng,
  • Xizhang Chen

摘要

This study successfully fabricated the Fe72Si16B7Cu1Nb4 iron-based amorphous alloy via melt-spinning and systematically investigated structural relaxation, magnetic domain structure evolution, and their impact on coercivity through precisely controlled multi-step annealing at primary annealing temperatures (510 , 520 , 530 , and 540 °C). The results reveal that as the annealing temperature increased from 510 °C to 540 °C, the volume fraction of the crystalline phase significantly increased from 59.53 to 71.43%, while the thickness of the residual amorphous layer decreased noticeably from 1.987 to 1.673 nm. Furthermore, the annealing treatment led to a substantial enhancement in the alloy’s saturation magnetic induction from 0.597 to 1.120 T, and a dramatic reduction in coercivity from 15.623 to 0.298 A/m. This research elucidates the critical role of enhanced atomic mobility, atomic rearrangement, and elimination of free volume in optimizing the magnetic domain structure and improving soft magnetic properties. This study provides valuable guidance for the design of high-sensitivity magnetic cores in power electronics, such as residual current protection devices, by optimizing coercivity through controlled annealing.