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Herein, we report high magnetocaloric performance of melt-extracted metallic glass Gd 60 Al 20 Co 20 microwires, which exhibit a large and reversible magnetocaloric effect (MCE). The isothermal magnetic entropy change (−Δ S m ) reaches as high as 10.1 J kg −1 K −1 and the refrigerant capacity (RC) has a large value of 681 J kg −1 for a field change of 5 T. The as-obtained Gd-based metallic glass microwires hold a great promise for multifunctional applications in MCE-based refrigeration of liquid nitrogen temperature range. [ABSTRACT FROM AUTHOR]

• High entropy Gd 19 Tb 19 Er 18 Fe 19 Al 25 microwires were fabricated by melt-extraction. • Gd 19 Tb 19 Er 18 Fe 19 Al 25 microwires show amorphous structure and SOMT. • Gd 19 Tb 19 Er 18 Fe 19 Al 25 microwires show broaden working temperature range. In this paper, the magnetocaloric effect (MCE) of a high-entropy Gd 19 Tb 19 Er 18 Fe 19 Al 25 amorphous microwires fabricated by melt-extracted method are investigated systematically. These microwires exhibit a second-order phase transition from ferromagnetic to paramagnetic states at the Curie temperature of 97 K. The zero-field-cooling (ZFC) and field-cooling (FC) magnetization curves are irreversible when the temperature lower than the Curie temperature due to the spin glassy freezing behavior. The peak magnetic entropy change (Δ S M pk ) for a field change from 0 to 5 T reaches ~5.94 J/kg∙K. In accordance to two criteria refrigerant capacity, the values of refrigerant capacity (RC) and relative cooling power (RCP) reach ~569 J/kg and ~733 J/kg at a field change of 5 T, respectively. These results suggest that the melt-extracted Gd 19 Tb 19 Er 18 Fe 19 Al 25 microwires exhibit good MCE and have great potential to use as one kind of high temperature magnetic refrigeration material. [ABSTRACT FROM AUTHOR]