Thermodynamic Properties and Magnetocaloric Effect of Spins-1/2 Square Lattice

This work aims to investigate the thermodynamic properties and magnetocaloric effect (MCE) of spins - 1/2 square lattice using Monte Carlo simulation. The considered Ising model is parameterized by the couplings J, aJ and bJ; where J is the ferromagnetic exchange interaction between first nearest-neighbor spins, a is the anisotropic parameter and bJ is the ferromagnetic exchange interaction between second nearest-neighbor spins. Monte Carlo simulation under Metropolis algorithm allows us to study some thermodynamic properties and MCE of spins - 1/2 square lattice. The discussion of the obtained results allowed us to specify the conditions which can enrich the MCE in spins - 1/2 square lattice. The two-dimensional anisotropic Ising model presents clarifying the critical point of the ferromagnetic-paramagnetic transition, and we have shown that the maximum entropy variation increases when it occurs at the ferromagnetic-paramagnetic transition temperature regardless of the intensity of the applied magnetic field and the values of "a" and "b".