Room temperature table-like magnetocaloric effect in amorphous Gd ₅₀ Co ₄₅ Fe ₅ ribbon

Gd 50 Co 45 Fe 5 amorphous alloy ribbon with a table-like magnetocaloric effect (MCE) suitable for the ideal Ericsson cycle at room temperature has been developed. In addition to a high magnetic transition temperature of 289 K very close to that of Gd (294 K), a relatively large value of refrigerant capacity (~521 J kg −1 ) has been achieved under a field change of 5 T. This value of refrigerant capacity (RC) is about 27% and 70% larger than those of Gd (~410 J kg −1 ) and Gd 5 Si 2 Ge 2 (~306 J kg −1 ). More importantly, the peak value of magnetic entropy change ( ) approaches a nearly constant value of ~3.8 J ⋅ kg −1 ⋅ K −1 under an applied field change of 0~5 T in a wide temperature span over 40 K around room temperature, which could be used as the candidate working material in the Ericsson-cycle magnetic regenerative refrigerator around room temperature.