Magnetocaloric properties of the spin-S (S ≥ 1) Ising model driven by a time dependent oscillating magnetic field

Abstract By means of mean field approximation, we have investigated magnetocaloric properties of the spin-S Ising model for some spin values S = 1 , 3 / 2 , 2 , 5 / 2 , 3 and 7/2 on a simple cubic lattice. The considered system is driven by a time dependent oscillating magnetic field including a bias field. Effects of the spin magnitude, oscillating magnetic field amplitude ( h 0 / J ) and bias field ( h b / J ) on the dynamic critical behavior, isothermal entropy change ( | Δ S M | ) and cooling capacity (q) of the system have been elucidated in detail. Our numerical outcomes indicate that both bias and oscillating magnetic fields prominently affect the | Δ S M | and q values of the system. When h b / J is increased, both | Δ S M | and q quantities get larger for all considered spin magnitudes, in the absence of oscillating field. It is found that there is a linear relationship between q and h b / J such that it will obey the law: q ∝ γ ( S ) h b / J for all spin magnitudes. Moreover, the isothermal entropy change varies in such manner that it exhibits an exponential behavior, | Δ S M | ∝ e α h 0 / J for a fixed value of bias field. These results show that the magnetocaloric properties of a material can be adjusted by changing the oscillating magnetic field components as well as bias field.