The magnetocaloric and magnetic properties of Pr0.7Sr0.3MnO3 film on Pb(Mg1/3Nb2/3)0.7Ti0.3O3

The magnetocaloric and ferromagnetic properties of Pr0.7Sr0.3MnO3 film grown on (001) Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3 (PMN-PT) using pulsed laser deposition technology have been investigated in this work. The X-ray diffraction measurement shows that the (001)-oriented film has been successfully deposited on PMN-PT substrate. The ferromagnetic properties and magnetocaloric effect resulted from ferromagnetic transition are explored via using the magnetic moment versus temperature plots, hysteresis loops, and the magnetic moment versus magnetic field curves. The magnetic moment versus temperature plots (M-T curves) show that with the decrease of temperature, the Pr0.7Sr0.3MnO3 film undergoes a transition from paramagnetic to ferromagnetic phase at temperature close to Curie-Weiss temperature (T-CW). T-CW (approximately 133 K) is determined by the Curie-Weiss law. The Pr0.7Sr0.3MnO3 film reveals the ferromagnetic feature below T-CW, while the film exhibits the paramagnetic state at temperature higher than T-CW. Hysteresis loops also confirm that the film reveals ferromagnetic feature at temperature lower than T-CW (e.g. ferromagnetic behaviors at 10 and 100 K). The result of hysteresis loops is in accordance with the M-T curves. Besides, entropy change has been investigated in our work. The maximum entropy change of Pr0.7Sr0.3MnO3 film reaches about 2.4 J/kg center dot K at around T-CW under 10 kOe field change, that is close to the entropy change of reference sample Gd (approximately 2.8 J/kg center dot K within the field change of 10 kOe), suggesting that the Pr0.7Sr0.3MnO3 film on PMN-PT has a great application prospect in magnetic refrigeration.