The inverse magnetocaloric effect of Ni–Co–Mn–Al quaternary alloy with the relatively low material cost is achieved firstly in a theoretical study (V. Sokolovskiy et al.: J. Appl. Phys., 2020, vol. 127, p. 163901). To investigate and prove this study, the exact composition of \(\hbox{Ni}_{{40}}\hbox{Co}_{{10}}\hbox{Mn}_{{36}}\hbox{Al}_{{14}}\) alloy is selected and and explored by the combination of X-ray diffraction, scanning electron microscopy, resistivity, and magnetic studies. The quaternary alloy reveals that the main phase is associated with a martensitic L1₀ phase structure with some austenitic B2 phase in the vicinity of room temperature. The results show that the alloy maintains both Austenite and Martensite phases and has a grand scale change in magnetization of approximately 95 emu \(\hbox{g}^{-1}\) around the Martensitic phase transition (in the range of 20 K) that exhibits a first-order magnetic transition from ferromagnetic to non-ferromagnetic state. The alloy reveals the inverse magnetic entropy change of about 12 and 8 J \(\hbox{kg}^{-1}\,\hbox{K}^{-1}\) and the relative cooling power of 125 and 76 J kg⁻¹ under only 15 and 10 kOe, respectively. Likewise, the MR value of 11.5 pct obtains in the external magnetic field source of 10 kOe in the heating direction. The experimental results support the referenced theoretical study and make this material prominent in future magnetocaloric and magnetoresistivity studies.

Ni-Co-Mn-Al 四元合金材料成本相对较低的逆磁热效应首先在理论研究中实现（V. Sokolovskiy 等：J. Appl. Phys. , 2020, vol. 127, p. 163901）。为了调查和证明这项研究，\(\hbox{Ni}_{{40}}\hbox{Co}_{{10}}\hbox{M​​n}_{{36}}\hbox{Al }_{{14}}\)合金是通过 X 射线衍射、扫描电子显微镜、电阻率和磁性研究的结合来选择和探索的。四元合金表明主相与马氏体 L1 ₀在室温附近具有一些奥氏体 B2 相的相结构。结果表明，该合金同时保持奥氏体和马氏体相，并且在马氏体相变（在 20 K 范围内）附近磁化强度发生了大约 95 emu \(\hbox{g}^{-1}\) 的大规模变化 ) 表现出从铁磁态到非铁磁态的一阶磁跃迁。合金显示约12和8 J的逆磁熵变 \(\hbox{kg}^{-1}\,\hbox{K}^{-1}\)和125和76 J的相对冷却功率公斤^-1分别低于 15 和 10 kOe。同样，在加热方向 10 kOe 的外部磁场源中获得 11.5 pct 的 MR 值。实验结果支持了参考的理论研究，并使该材料在未来的磁热和磁阻研究中具有突出地位。