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<p>In this study, we investigated the magnetocaloric response of a quinary Ni<sub>48</sub>Mn<sub>34</sub>In<sub>13</sub>Ga<sub>3</sub>Cu<sub>2</sub> ferromagnetic shape memory alloy (FSMA). The alloy was synthesized by arc melting from high-purity elements and then annealed at 1173&#xa0;K for 24&#xa0;h to favor the formation of a fully ordered L2<sub>1</sub> austenite. Differential scanning calorimetry (DSC) and isofield magnetization curves acquired at 5 mT confirmed the occurrence of a martensitic transformation near room temperature, characterized by a narrow thermal hysteresis of 6&#xa0;K, and Curie temperature (T<sub>C</sub>) at 290&#xa0;K. Room-temperature X-ray diffraction (XRD) analysis verified the presence of a single-phase L2<sub>1</sub> austenite. The magnetic field-induced entropy changes (ΔS<sub>Mag</sub>) were calculated from a series of isofield magnetization curves up to 2&#xa0;T using a Maxwell relationship. The resulting ΔS<sub>Mag</sub> value was 15.7, 8.2, and − 2.9 Jkg<sup>−1</sup>&#xa0;K<sup>−1</sup>, corresponding to the first-order, reversible, and second-order transitions, respectively.</p> Graphical abstract <p></p>

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Reversible magnetocaloric effect in low-hysteresis Ni–Mn–In–Ga–Cu ferromagnetic shape memory alloy

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • J. P. Camarillo-Garcia,
  • H. I. Gala-Barrón,
  • H. Flores-Zúñiga,
  • P. Álvarez-Alonso,
  • J. López-García,
  • F. Alvarado-Hernández

摘要

In this study, we investigated the magnetocaloric response of a quinary Ni48Mn34In13Ga3Cu2 ferromagnetic shape memory alloy (FSMA). The alloy was synthesized by arc melting from high-purity elements and then annealed at 1173 K for 24 h to favor the formation of a fully ordered L21 austenite. Differential scanning calorimetry (DSC) and isofield magnetization curves acquired at 5 mT confirmed the occurrence of a martensitic transformation near room temperature, characterized by a narrow thermal hysteresis of 6 K, and Curie temperature (TC) at 290 K. Room-temperature X-ray diffraction (XRD) analysis verified the presence of a single-phase L21 austenite. The magnetic field-induced entropy changes (ΔSMag) were calculated from a series of isofield magnetization curves up to 2 T using a Maxwell relationship. The resulting ΔSMag value was 15.7, 8.2, and − 2.9 Jkg−1 K−1, corresponding to the first-order, reversible, and second-order transitions, respectively.

Graphical abstract