Critical Behavior and Magnetocaloric Properties of LPSMO Nanocrystals via Landau Theory

Abstract This study presents a computational methodology that combines the Landau theory with the Arrott–Noakes equation. Through an innovative formulation, simulations are performed to investigate the magnetic entropy change, , in a disordered ferromagnetic system. The theoretical framework is applied to analyze the critical behavior using experimental isothermal magnetization data of (La 1–x Pr x ) 0.7 Sr 0.3 MnO 3 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) nanocrystalline perovskites. Initially, the critical exponents ( and ) of these materials are determined. It is observed that the magnetic properties of the studied compounds near the phase transition deviate from the mean‐field model. These critical exponents are then used to simulate isothermal and curves.