Giant magnetocaloric effect in Tm-based bulk metallic glasses

We report that the maximum magnetic entropy change ΔSm of Tm39Ho16Co20Al25 metallic glass can reach 18.3 Jkg− 1 K− 1 under 5 T, which is larger than that of any previously reported metallic glasses and comparable with that of the giant magnetocaloric effect material Gd5Si2Ge2 compound. Even under low magnetic field of 2 T, the ΔSm of the glass can reach 10.3 Jkg− 1 K− 1 which is even larger that of most of other metallic glasses under 5 T. The excellent magnetocaloric effect and refrigerant efficiency together with unique mechanical and physical properties of the metallic glasses indicate they are promising candidate for magnetic refrigerants.