The impact of combining Pr0.63Dy0.07Sr0.3/La0.8Dy0.2MnO3 manganites at a ratio of 50:50 and 75:25 on the improvement of magnetic refrigeration technique

Structural, magnetic, and magnetocaloric properties of Pr 0.63 Dy 0.07 Sr 0.3 MnO 3 (PrDySr), La 0.8 Dy 0.2 MnO 3 (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.