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<p>The goal of this investigation is to evaluate the validity of the phenomenological model<?ColorInfoStart FFFFFF-Background1?> <?ColorInfoEnd FFFFFF-Background1?>(PM) for the magnetocaloric effect (MCE) in Ni<sub>2</sub>Mn<sub>0.55</sub>Cu<sub>0.35</sub>Fe<sub>0.10</sub>Ga during the first order phase transition (FOPT) at 5 T. Furthermore, the MCE of Ni<sub>2</sub>Mn<sub>0.55</sub>Cu<sub>0.35</sub>Fe<sub>0.10</sub>Ga during the second order phase transition (SOPT) is studied. Interestingly, the agreement between the simulated magnetic entropy change (3.5&#xa0;J/kg.K) and the reported one (3.2&#xa0;J/kg.K) for FOPT is quite precise across the whole temperature range. Furthermore, Ni<sub>2</sub>Mn<sub>0.55</sub>Cu<sub>0.35</sub>Fe<sub>0.10</sub>Ga ‘s relative cooling power has been calculated to be 207 and 73 J/kg for SOPT and FOPT, respectively. Moreover, the simulated heat capacity change via the FOPT reaches a maximum value of 90.8 J/kg.K. These findings suggest that PM is a reliable model for studying MCE in the FOPT and SOPT since it reduces the time and effort necessary to compute and quantify it. Consequently, we believe the PM can be utilized for predicting the MCE parameters in any magnetic transition. It is indicated that Ni<sub>2</sub>Mn<sub>0.55</sub>Cu<sub>0.35</sub>Fe<sub>0.10</sub>Ga can be employed as an essential refrigerant magnet at ambient temperature and at higher and lower temperatures.</p>

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Investigation of magnetocaloric effects during first-order and second-order phase transitions in Ni2Mn0.55Cu0.35Fe0.10Ga

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Mahmoud A. Hamad,
  • Hatem R. Alamri,
  • Mohamed E. Harb,
  • Sameh M. Elghnam

摘要

The goal of this investigation is to evaluate the validity of the phenomenological model (PM) for the magnetocaloric effect (MCE) in Ni2Mn0.55Cu0.35Fe0.10Ga during the first order phase transition (FOPT) at 5 T. Furthermore, the MCE of Ni2Mn0.55Cu0.35Fe0.10Ga during the second order phase transition (SOPT) is studied. Interestingly, the agreement between the simulated magnetic entropy change (3.5 J/kg.K) and the reported one (3.2 J/kg.K) for FOPT is quite precise across the whole temperature range. Furthermore, Ni2Mn0.55Cu0.35Fe0.10Ga ‘s relative cooling power has been calculated to be 207 and 73 J/kg for SOPT and FOPT, respectively. Moreover, the simulated heat capacity change via the FOPT reaches a maximum value of 90.8 J/kg.K. These findings suggest that PM is a reliable model for studying MCE in the FOPT and SOPT since it reduces the time and effort necessary to compute and quantify it. Consequently, we believe the PM can be utilized for predicting the MCE parameters in any magnetic transition. It is indicated that Ni2Mn0.55Cu0.35Fe0.10Ga can be employed as an essential refrigerant magnet at ambient temperature and at higher and lower temperatures.