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<p>The applied magnetic field intensity and the magnetic state of the reacted phase are important factors for in-magnetic-field phase growth. In this study, the in-magnetic-field reaction in Mn/Ga diffusion couples was analyzed under applied magnetic fields of up to 15&#xa0;T at 573&#xa0;K and 773&#xa0;K. It was found that the growth rates of the Ga-rich phases (λMnGa and Mn<sub>2</sub>Ga<sub>5</sub> phases) showed different behavior with respect to the magnetic field intensity when the Mn-rich phases (Mn<sub>3</sub>Ga and γMnGa phases) were ferromagnetic at 573&#xa0;K and paramagnetic at 773&#xa0;K. At 573&#xa0;K, the thicknesses of the Ga-rich phases at 5&#xa0;T became thinner than the same phases at 0&#xa0;T, and further decreased asymptotically under a higher magnetic field of 15&#xa0;T. The thicknesses of the Mn-rich phases were independent of the magnetic field intensity. At 773&#xa0;K, the thicknesses of the Ga-rich phases in a 10&#xa0;T-annealed sample were reduced to 45–55% of the corresponding thicknesses in a 5&#xa0;T-annealed sample. These behaviors were explained based on the contribution of the Zeeman energy to the formation enthalpy of the Mn-Ga phases in the ferromagnetic and paramagnetic regions.</p>

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Effects of Magnetic Field Intensity on the Reaction in Mn/Ga Diffusion Couple

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Yoshifuru Mitsui,
  • Yumi Watanabe,
  • Ryota Kobayashi,
  • Kohki Takahashi,
  • Keiichi Koyama

摘要

The applied magnetic field intensity and the magnetic state of the reacted phase are important factors for in-magnetic-field phase growth. In this study, the in-magnetic-field reaction in Mn/Ga diffusion couples was analyzed under applied magnetic fields of up to 15 T at 573 K and 773 K. It was found that the growth rates of the Ga-rich phases (λMnGa and Mn2Ga5 phases) showed different behavior with respect to the magnetic field intensity when the Mn-rich phases (Mn3Ga and γMnGa phases) were ferromagnetic at 573 K and paramagnetic at 773 K. At 573 K, the thicknesses of the Ga-rich phases at 5 T became thinner than the same phases at 0 T, and further decreased asymptotically under a higher magnetic field of 15 T. The thicknesses of the Mn-rich phases were independent of the magnetic field intensity. At 773 K, the thicknesses of the Ga-rich phases in a 10 T-annealed sample were reduced to 45–55% of the corresponding thicknesses in a 5 T-annealed sample. These behaviors were explained based on the contribution of the Zeeman energy to the formation enthalpy of the Mn-Ga phases in the ferromagnetic and paramagnetic regions.