Critical Behavior and Magnetocaloric Simulation in LSMO/NaF Composites Using Landau Theory

ABSTRACT The critical behavior of (1−x) LSMO/xNaF composites with x = 0, 0.05, 0.15, and 0.20 near the second‐order paramagnetic–ferromagnetic transition is investigated through a combination of Arrott–Noakes formalism (ANF) and Kouvel–Fisher (KF) analysis. Critical exponents ( β , γ ) are determined iteratively to be (1.0004, 0.3406), (1.1593, 0.6230), (1.0467, 0.4391), and (1.0479, 0.4673) for (1‐x)LSMO/xNaF with x = 0, 0.05, 0.15, and 0.20, respectively. Furthermore, magnetocaloric entropy changes , computed via Landau theory, exhibited strong correspondence with Maxwell relation results, with minor discrepancies at high fields attributed to saturation effects. Overall, the results highlight the robustness of Landau phenomenology in describing criticality and magnetocaloric behavior, while revealing subtle doping‐induced modifications in exchange interactions.