  In this paper, we study the effect of both an external and crystal magnetic
fields for a superlattice with mixed spins (1/2, 1), using Monte Carlo
simulations. The ground state phase diagrams, in the external magnetic field,
coupling constant and the crystal magnetic field planes, were established. The
effect of increasing temperatures has also been established showing the
behavior of the magnetizations and susceptibilities, for fixed crystal field
values. In particular, the obtained results as well as in the ground state
phase diagrams, as for non null temperature are obtained for fixed external
magnetic and crystal field values. On the other hand, the effect of the
temperature on the hysteresis loops is presented showing that the decreasing
temperature effect is to increase the absolute values of the corresponding
coercitif magnetic field.
