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<p>The influence of a 5&#xa0;T magnetic field on the liquid–solid reaction of ferromagnetic MnBi phase at 573&#xa0;K was investigated using Bi/Mn diffusion couples. A MnBi phase layer was not formed but MnBi grains were observed at the Bi/Mn interface. Because of the formation of MnBi grains, concavities were observed on the Mn surface. At 0&#xa0;T, the concavities expanded with increasing annealing time. The magnetic field increased the number of nucleation sites of the MnBi phase, which also increased the number of concavities at the Mn surface. The MnBi grains synthesized at 0&#xa0;T were isotropic and randomly oriented, while the MnBi grains at 5&#xa0;T were elongated along the <i>c</i>-axis and oriented parallel to the magnetic field direction. The in-field reaction enhanced the number of nucleation sites of MnBi phase and oriented the elongated MnBi grains.</p>

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Liquid–Solid Reaction of MnBi Phase in Bi/Mn Diffusion Couples under a Magnetic Field

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Yukinari Sueyoshi,
  • Ryota Kobayashi,
  • Yoshifuru Mitsui,
  • Keiichi Koyama

摘要

The influence of a 5 T magnetic field on the liquid–solid reaction of ferromagnetic MnBi phase at 573 K was investigated using Bi/Mn diffusion couples. A MnBi phase layer was not formed but MnBi grains were observed at the Bi/Mn interface. Because of the formation of MnBi grains, concavities were observed on the Mn surface. At 0 T, the concavities expanded with increasing annealing time. The magnetic field increased the number of nucleation sites of the MnBi phase, which also increased the number of concavities at the Mn surface. The MnBi grains synthesized at 0 T were isotropic and randomly oriented, while the MnBi grains at 5 T were elongated along the c-axis and oriented parallel to the magnetic field direction. The in-field reaction enhanced the number of nucleation sites of MnBi phase and oriented the elongated MnBi grains.