Magnetocaloric properties of R2NiMnO6 (R=Pr, Nd, Tb, Ho and Y) double perovskite family

Double perovskite R2NiMnO6 (R=Pr, Nd, Tb, Ho and Y) composites are prepared via solid state synthesis or nitrate route. Isothermal magnetic entropy change (ΔSM(T,H)) and relative cooling power (RCP) for all systems are calculated and compared. All of them possess relatively high values of ΔSM(T,H) and RCP as compared to many perovskite and double perovskite systems reported previously. Ho2NiMnO6 has the highest value for |ΔSM(T,H)| and RCP as 8.4 JKg−1K−1 at 70 kOe and 59.18 J Kg−1 at 20 kOe respectively. This study highlights the potential of magnetocaloric refrigerant materials at low temperature.