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<p>Finemet alloys have been extensively used for their superior soft magnetic properties at high frequencies. In this work, the effects of normal annealing (NA) and secondary transverse magnetic field annealing (NA + TMA) on the soft magnetic properties of cores fabricated from ultrathin Finemet ribbons (14–16&#xa0;μm) were systematically investigated. Compared with NA-treated samples, the NA + TMA-treated ultrathin ribbon cores exhibit significantly enhanced high-frequency soft magnetic performance, outperforming commercially available thicker Finemet ribbon cores. Among all samples, the NA555 + TMA-treated core shows the best performance, with a saturation magnetic flux density (<i>B</i><sub>s</sub>) of 1.15&#xa0;T, a coercivity (<i>H</i><sub>c</sub>) of 0.65 A/m, an effective permeability (<i>μ</i><sub><i>e</i></sub>) of 41,350, a quality factor (<i>Q</i>) of 1.72, and a core loss (<i>P</i><sub><i>s</i></sub>) of 14.5 W/kg at 100&#xa0;kHz under a maximum magnetic flux density of 0.2&#xa0;T. X-ray diffraction (XRD) analysis indicates that no new phases are formed after TMA, and both the grain size and crystalline volume fraction remain nearly unchanged, suggesting that the performance enhancement is unlikely to arise from microstructural refinement. Instead, the improvement is primarily associated with the modulation of magnetic anisotropy, magnetic domain structure, and residual stress induced by the transverse magnetic field annealing (TMA) process.</p>

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Effect of secondary transverse magnetic field annealing on soft magnetic properties of cores with ultrathin Finemet ribbons

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Chao Huang,
  • Qijie Ye,
  • Chen Yang,
  • Shixin Tan,
  • Lansong Yang,
  • Junlei Shi,
  • Pingjun Tao,
  • Yuanzheng Yang

摘要

Finemet alloys have been extensively used for their superior soft magnetic properties at high frequencies. In this work, the effects of normal annealing (NA) and secondary transverse magnetic field annealing (NA + TMA) on the soft magnetic properties of cores fabricated from ultrathin Finemet ribbons (14–16 μm) were systematically investigated. Compared with NA-treated samples, the NA + TMA-treated ultrathin ribbon cores exhibit significantly enhanced high-frequency soft magnetic performance, outperforming commercially available thicker Finemet ribbon cores. Among all samples, the NA555 + TMA-treated core shows the best performance, with a saturation magnetic flux density (Bs) of 1.15 T, a coercivity (Hc) of 0.65 A/m, an effective permeability (μe) of 41,350, a quality factor (Q) of 1.72, and a core loss (Ps) of 14.5 W/kg at 100 kHz under a maximum magnetic flux density of 0.2 T. X-ray diffraction (XRD) analysis indicates that no new phases are formed after TMA, and both the grain size and crystalline volume fraction remain nearly unchanged, suggesting that the performance enhancement is unlikely to arise from microstructural refinement. Instead, the improvement is primarily associated with the modulation of magnetic anisotropy, magnetic domain structure, and residual stress induced by the transverse magnetic field annealing (TMA) process.