The emergence of considerable room temperature magnetocaloric performances in the transition metal high-entropy alloys

We herein investigated the structural, magnetic, and magnetocaloric properties of Mn20Al20Co14Fe20+xCr26-xhigh entropy (HE) alloys by experimental determination and first principle calculations. The results indicated that these alloys were crystallized in a disordered body-centered cubic structure.The Fe substitution of Cr enhanced the energy and net magnetic moment of these alloys, resulting in the improvement of magnetic properties. All the Mn20Al20Co14Fe20+xCr26-x HE alloys underwent a second-order magnetic transition with theCurie temperature ranges of 268.2–310.6 K. The magnetocaloric performances of Mn20Al20Co14Fe20+xCr26-x HE alloys were examined by using the magnetic entropy change, relative cooling power, refrigerant capacity, temperature average entropy change, and mechanical properties, which are superior to the reported transition metal-based magnetocaloric materials with second order magnetic phase transition. By considering the realized considerablemagnetocaloricperformances and the benefits of transition metal HE alloys, the present Mn20Al20Co14Fe20+xCr26-x HE alloys are also of potential for room temperature MR application. The present work would provide a large family of transition metal HE alloys with significant magnetocaloric performances.