Energy-Efficient Cooling with Large Magnetocaloric Effect in Dy₂In_0.8Al_0.2 and Dy₂In_0.7Al_0.3 ingots

In this paper, the magnetocaloric effect in both second- and first-order magnetic phase transitions for Dy2In0.8Al0.2 and Dy2In0.7Al0.3 ingots, respectively, was simulated using the mean-field model. This model investigated the exchange mean-field by analyzing isothermal magnetization data. Through a scaling technique and using the Brillouin function key magnetic parameters such as the saturation magnetization M0, the total magnetic moment quantum number J, and the Lande factor g for each compound were effectively determined. A strong correlation between simulated and experimental magnetization values was established. The magnetic entropy change formula was also derived, and entropy change curves under various magnetic fields around the magnetic phase transition were generated. Under a 7 T magnetic field, the relative cooling power (RCP) is 487.6 J•kg^-1 for the Dy₂In_0.8Al_0.2 and 594.3 J•kg^-1 for the Dy₂In_0.7Al_0.3 sample. The corresponding maximum magnetic entropy change (|∆S_M^Max|) values are 10.48 J•kg^-1•K^-1 and 12.22 J•kg^-1•K^-1, respectively. These findings highlight the potential of these materials for energy-efficient applications in environmentally sustainable magnetic refrigeration systems.