The impact of combining Pr_0.63Dy_0.07Sr_0.3/La_0.8Dy_0.2MnO₃ manganites at a ratio of 50:50 and 75:25 on the improvement of magnetic refrigeration technique

Structural, magnetic, and magnetocaloric properties of Pr_0.63Dy_0.07Sr_0.3MnO₃ (PrDySr), La_0.8Dy_0.2MnO₃ (LaDy), and their composites (50:50 and 75:25) were meticulously examined to assess their applicability in advanced cooling technologies. Structural analysis verified the presence of nanosized crystallites exhibiting a consistent orthorhombic structure across all samples. Magnetic measurements indicated a clear ferromagnetic-to-paramagnetic phase transition close to the Curie temperature, as well as solid-state freezing behavior at the blocking temperature. Among the examined systems, the 50:50 composite displayed outstanding magnetocaloric performance, attaining an extraordinary isothermal entropy change of 207.12(1) J/kg and exhibiting significant relative cooling power in a 4 T magnetic field. These findings position the 50:50 composite as a highly promising material for energy-efficient magnetic refrigeration, offering both superior performance and practical applicability.