Magnetocaloric Effect in an Ising Ferromagnet in the Constant Coupling Approximation

The magnetocaloric effects in an Ising ferromagnet with short-range exchange interactions between nearest magnetic neighbors are calculated using the constant coupling cluster approximation. It is shown that, compared with the results given by the molecular field approximation, the constant coupling approximation gives greater effects both in the magnetic entropy under isothermal magnetization and in the sample temperature upon adiabatic switching of the magnetic field.