Ideal Ericsson cycle magnetocaloric effect in (La0.9Gd0.1)0.67Sr0.33MnO3 single crystalline nanoparticles

► Curie temperature can be tuned and decreased with Gd doping. ► The −ΔSM has the important feature of remaining almost constant in the temperature range above 60 K. ► The relative cooling power (RCP) value is about 99 J/kg for the applied field of 1 T. ► This type of nano-material is an ideal Ericsson cycle magnetic refrigerant for operation at room temperature.