Structure,magnetic properties and cryogenic magneto-caloric effect (MCE) in RE2FeAlO6 (RE = Gd,Dy, Ho) oxides

In this study, we present the crystal structure, magnetic properties, and cryogenic magneto-caloric effect (MCE) of RE₂FeAlO₆ (RE = Gd, Dy, Ho) oxides. The XRD refinement analysis suggests that all the RE₂FeAlO₆ oxides are crystallized in B-site disordered orthorhombic structure. The RE₂FeAlO₆ oxides exhibit large MCEs around T_C. The peak magnetic entropy change (-ΔS_M) and refrigeration capacity (RC) are 25.9 J/(kgK) and 240.1 J/kg for Gd₂FeAlO₆, 10.7 J/(kgK) and 274.9 J/kg for Dy₂FeAlO₆, 9.6 J/(kgK) and 249.6 J/kg for Ho₂FeAlO₆ under ΔH of 0–70 kOe, respectively. Notably, Gd₂FeAlO₆ exhibits promising magneto-caloric performance and therefore is a favorable candidate for cryogenic magnetic refrigeration.