Magnetocaloric effect of melt-extracted high-entropy Gd19Tb19Er18Fe19Al25 amorphous microwires

Abstract In this paper, the magnetocaloric effect (MCE) of a high-entropy Gd19Tb19Er18Fe19Al25 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 97K. 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 5T 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 5T, respectively. These results suggest that the melt-extracted Gd19Tb19Er18Fe19Al25 microwires exhibit good MCE and have great potential to use as one kind of high temperature magnetic refrigeration material.