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<p>Magnetic field effects on the activation energy, <i>E</i><sub>a</sub>, of phase transformation in the hcp phase of Mn<sub>55</sub>Al<sub>45</sub>C<sub>2</sub> and Mn<sub>53</sub>Zn<sub>2</sub>Al<sub>45</sub> were investigated by differential thermal analysis (DTA) under high magnetic fields up to 10&#xa0;T. Single exothermic peak including plural transformations was observed for both Mn<sub>55</sub>Al<sub>45</sub>C<sub>2</sub> and Mn<sub>53</sub>Zn<sub>2</sub>Al<sub>45</sub>. No systematic magnetic field dependence of transformation temperature was observed for either Mn<sub>55</sub>Al<sub>45</sub>C<sub>2</sub> or Mn<sub>53</sub>Zn<sub>2</sub>Al<sub>45</sub>. <i>E</i><sub>a</sub> for Mn<sub>55</sub>Al<sub>45</sub>C<sub>2</sub> and Mn<sub>53</sub>Zn<sub>2</sub>Al<sub>45</sub> under magnetic fields showing different behavior. <i>E</i><sub>a</sub> for Mn<sub>55</sub>Al<sub>45</sub>C<sub>2</sub> monotonically increased with increasing magnetic field intensity, whereas <i>E</i><sub>a</sub> for Mn<sub>53</sub>Zn<sub>2</sub>Al<sub>45</sub> had a minimum value at 5&#xa0;T. These magnetic field effects on <i>E</i><sub>a</sub> have been discussed by dividing the reduction effect of <i>E</i><sub>a</sub> (transformation to ferromagnetic phase) in the lower magnetic field region and the enhancement effect of <i>E</i><sub>a</sub> (transformation from ferromagnetic phase) in the higher magnetic field region.</p>

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Differential Thermal Analysis of Ferromagnetic Mn55Al45C2 and Mn53Zn2Al45 Under High Magnetic Fields

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Ryota Kobayashi,
  • Shuto Fumoto,
  • Yoshifuru Mitsui,
  • Kohki Takahashi,
  • Keiichi Koyama

摘要

Magnetic field effects on the activation energy, Ea, of phase transformation in the hcp phase of Mn55Al45C2 and Mn53Zn2Al45 were investigated by differential thermal analysis (DTA) under high magnetic fields up to 10 T. Single exothermic peak including plural transformations was observed for both Mn55Al45C2 and Mn53Zn2Al45. No systematic magnetic field dependence of transformation temperature was observed for either Mn55Al45C2 or Mn53Zn2Al45. Ea for Mn55Al45C2 and Mn53Zn2Al45 under magnetic fields showing different behavior. Ea for Mn55Al45C2 monotonically increased with increasing magnetic field intensity, whereas Ea for Mn53Zn2Al45 had a minimum value at 5 T. These magnetic field effects on Ea have been discussed by dividing the reduction effect of Ea (transformation to ferromagnetic phase) in the lower magnetic field region and the enhancement effect of Ea (transformation from ferromagnetic phase) in the higher magnetic field region.