Low-field induced large reversible magnetocaloric effect in Tm3Co compound

• For magnetic-field changes of 2 T, the -ΔSMmax and RCP are 11.6 J/kg K and 93 J/kg, respectively.
• Tm3Co compound’s MCEs show no thermal and magnetic hysteresis.
• Tm3Co compound shows two successive magnetic transitions with increasing the temperature: AFM to FM and FM to PM transition.

A large reversible magnetocaloric effect has been observed in Tm3Co compound. The Tm3Co compound exhibits two successive magnetic transitions with the increasing temperature: antiferromagnetic (AFM) to ferromagnetic (FM) transition at 4.5 K and FM to paramagnetic (PM) transition at 6.5 K. Under a magnetic field change of 5 T, the maximum value of magnetic entropy change −ΔSM is 19.9 J/kg K at 7.5 K and the refrigerant capacity power (RCP) is 300 J/kg with no hysteresis loss. In particular, the large reversible −ΔSM (11.6 J/kg K) is achieved for a low magnetic field change of 2 T. The large reversible magnetocaloric effect (both the large −ΔSM and the high RCP) indicates that Tm3Co could be a promising candidate for magnetic refrigeration.