Monte Carlo Investigation of the Magnetic and Thermal Properties of Four Sublattice Ferromagnetic– Antiferromagnetic Double-Layer Superlattices

Using Monte Carlo simulation, we have studied the magnetic and thermal properties of a four sublattice ferromagnetic (FM) and anti-FM (AFM) double-layer superlattices system in a longitudinal magnetic field. The effects of the intralayer AFM exchange coupling J₂, the single-ion anisotropy D and the longitudinal magnetic field h on the magnetization M, the susceptibility x, the internal energy U, and the specific heat c of the system are discussed in detail. Particular attention has been paid to the variations of the hysteresis loops of the system with the AFM exchange coupling J₂ and the anisotropy D. Some interesting results, such as the triple hysteresis and the exchange bias behavior, have been found under certain conditions.