Study of magnetic and magnetocaloric properties of FeMnO3 compound

Abstract The study reports a magnetocaloric effect (MCE) in the FeMnO 3 bixbyite compound prepared via autocombustion technique using nitrate salts. The X-ray diffraction (XRD) study showed that FeMnO 3 assumes a cubic phase with a space group Ia-3 . X-ray photoelectron spectroscopy (XPS) study confirmed the oxidation states of Fe 3+ and Mn 3+ . Temperature-dependent magnetization measurements revealed the presence of antiferromagnetic ordering in the compound at around 40 K. The effective magnetic moment, µ eff, was calculated as 2.36 µB from the susceptibility curve. Change in maximum magnetic entropy ǀ∆S Max ǀ , determined from magnetic isotherms, is approximately 4.14 Jkg −1 K −1 at 65 K under 5 T applied field, leading to higher relative cooling power, RCP as 200.29 Jkg −1 . Specific heat capacity, ∆Cp, and temperature-averaged entropy change, TEC , were also analyzed to study magnetic cooling efficiency. This study observed that FeMnO 3 displays potential MCE performance, making it a promising candidate for magnetic refrigeration applications. Graphical abstract