Magnetic property and magnetocaloric effect in TmCoAl compound. (January 2015) - Mo, Zhao-Jun
Abstract: A large reversible magnetocaloric effect accompanied by a second order magnetic phase transition from paramagnetic (PM) to ferromagnetic (FM) has been observed in TmCoAl intermetallic compound. For the magnetic field change of 5 T, the maximum value of magnetic entropy change (−Δ S M max ) and the value of refrigerant capacity (RC) are evaluated to be 18.2 J/kg K and 211 J/kg, respectively. In particular, a large −Δ S M max (10.2 J/kg K) is achieved at 7.5 K under a low magnetic field change from 0 to 2 T with no thermal hysteresis and magnetic hysteresis loss. The large reversible magnetocaloric effect (both the large −Δ S M and the high RC) indicates that TmCoAl is one of a promising material for magnetic refrigeration in low temperature. Highlights: The value of −Δ S M max is 10.2 J/kg K under field changes of 2 T. TmCoAl compound's MCEs show no thermal and magnetic hysteresis. TmCoAl compound shows second-order FM-PM magnetic transition.