Magnetic phase transitions and mixed spin in double perovskite Sr₂FeMoO₆

Abstract

Abstract The magnetic properties of the double perovskite oxide Sr 2 FeMoO 6 are analyzed using a mixed-spin Ising model with spins ( 1 2 , 5 2 ) in the presence of a random crystal field Δ and exchange interactions J on a three-dimensional cubic lattice. The study employs both the mean-field approximation based on the Bogoliubov inequality for Gibbs free energy and Monte Carlo simulations using the Metropolis algorithm to provide a comprehensive analysis of the system’s phase transitions and magnetization behavior, with focusing on the role of Fe and Mo sublattices. We establish the ground-state phase diagram, identifying multiple stable magnetic configurations and first-order transitions at low temperatures. Indicate compensation temperature T comp . This work provides deeper insight into the thermodynamic, statistical physics, and magnetic properties of Sr 2 FeMoO 6 ,with implications for future applications in spintronics and magnetic storage technologies. revealing multiple stable magnetic states, first-order transitions, and with high Curie temperatures ( T c = 420 K) above room temperature, and a distinct compensation temperature T comp , underscoring its potential for spintronic applications and advanced magnetic storage technologies.