Extraordinary magnetocaloric effect of Fe-based bulk glassy rods by combining fluxing treatment and J-quenching technique

•Fe-based BMG with diameters up to 2.0 mm were fabricated by J-quenching technique.•The largest value of ΔSM among the present Fe-based glassy alloys was found.•The ΔSM is attributed to coexistence of magnetic and spin reorientation transition.

The extraordinary magnetocaloric effect of Fe80P13C7 bulk glassy rods has been studied. The magnetic entropy change (ΔSM) and refrigerant capacity (RC) values under 1.5 T can reach 2.20 J kg−1 K−1 and 125 J kg−1, respectively, which are the largest values among present ternary Fe-based glassy alloys. It is found that the magnetocaloric effect vs temperature curve gradually changes into two peaks with increasing magnetic fields, leading to a much wider ΔSM peak and thus a larger RC. This extraordinary magnetocaloric effect in Fe80P13C7 may be attributed to the coexistence of magnetic transition and spin reorientation transition.