Due to the existence of the magnetic-field-induced reverse martensitic transformation, the Ni–Mn–Z alloys where Z is the p-block element of In, Sn or Sb exhibit several state-of-the-art magnetoresponsive properties. From the perspective of practical application, a major challenge of this compound is to strengthen the ferromagnetism and reduce the transitional hysteresis ΔT_Hys simultaneously. In this work, we report an alloying strategy to this issue, i.e., the partial substitutions of Co and Cu for Ni and the p-block element, respectively, by a combined study of experiment and ab-initio calculation in the Ni₄₅Co₅Mn₃₆In_14–xCu_x (x = 0–1.5) alloys. Results show that the Cu replacement for the p-block element (In) can effectively reduce ΔT_Hys owing to the improved geometrical compatibility between austenite and martensite. Moreover, the adopted alloying strategy of Cu hardly weakens the strong ferromagnetism of Ni(Co)–Mn–In, since the magnetism exhibits a weak dependence on the p-block element compared with Mn and Ni. The maximum reversible magnetic entropy change $\Delta S_M^{Max}$ of the Ni₄₅Co₅Mn₃₆In_13.3Cu_0.7 directionally solidified sample at a magnetic field of 5 T is 13.8 J·kg⁻¹·K⁻¹. The refrigeration capacity RC and effective refrigeration capacity RC_eff equal to 473.7 J·kg⁻¹ and 270.2 J·kg⁻¹, respectively. Both values belong to the highest one in the Ni–Mn-based alloys. Additionally, the working temperature window of the magnetocaloric effect is as wide as ~40 K. This work is expected to promote the design of advanced metamagnetic shape memory alloys.

由于磁场引起的马氏体逆相变的存在，其中Z是In，Sn或Sb的p元素的Ni-Mn-Z合金表现出几种最新的磁响应特性。从实际应用的角度来看，该化合物的主要挑战是增强铁磁性并同时降低过渡磁滞_ΔTHys。在这项工作中，我们报告了针对该问题的合金化策略，即通过在Ni ₄₅ Co _5中进行实验和从头算计算的组合研究，分别将Co和Cu分别置换为Ni和p嵌段元素。锰₃₆ In_14–x铜_x（x = 0–1.5）合金。结果表明，由于改善了奥氏体和马氏体之间的几何相容性，用铜代替p块元素（In）可以有效降低_ΔTHys。此外，采用的铜合金化策略几乎不会削弱Ni（Co）-Mn-In的强铁磁性，因为与Mn和Ni相比，磁性对p阻挡元素的依赖性较小。最大可逆磁熵变$\Delta {\mathrm{小号}}_{\mathrm{中号}}^{\mathrm{中号}\mathrm{一种}X}$在5 T的磁场下，定向凝固的Ni ₄₅ Co ₅ Mn ₃₆ In _13.3 Cu _0.7样品的当量为13.8 J·kg ^-1 ·K ^-1。制冷量RC和有效制冷量RC _eff分别等于473.7 J·kg ^-1和270.2 J·kg ^-1。这两个值均属于Ni-Mn基合金中的最高值。此外，磁热效应的工作温度范围高达〜40K。这项工作有望促进先进的亚磁形状记忆合金的设计。