Microstructure and magnetocaloric properties of melt-extracted SmGdDyCoAl high-entropy amorphous microwires

This paper presents a systematic investigation of the microstructure and magnetocaloric properties of melt-extracted Sm 20 Gd 20 Dy 20 Co 20 Al 20 high-entropy microwires. The fabricated wires exhibited an amorphous structure, and the temperature interval of the undercooled liquid Δ T was 45 K. The microwires underwent a second-order magnetic transition from a ferromagnetic to a paramagnetic state near the Curie temperature ( T C = 52 K). The maximum magnetic entropy change ( - Δ S_M^max ), the relative cooling power and the refrigeration capacity reached 6.34 J·kg −1 ·K −1 , 422.09 J·kg −1 and 332.94 J·kg −1 , respectively, under a magnetic field change of 5 T. In addition, the temperature-averaged entropy changes with two temperature lifts (3 and 10 K) were 6.32 and 6.27 J·kg −1 ·K −1 , respectively. The good magnetocaloric performance highlights the significant potential for the Sm 20 Gd 20 Dy 20 Co 20 Al 20 microwires to be used as magnetic refrigerant materials in low-temperature region applications. This work will serve as a valuable reference for future investigations on low-temperature high-entropy magnetocaloric materials. Graphic Abstract