MAGNETIC-PROPERTIES OF THE 3-DIMENSIONAL ISING-MODEL WITH INTERFACE SINGLE-ION-ANISOTROPY

Within the framework of effective-field theory, we investigate the eff ects of an interface single-ion anisotropy on the magnetic properties in the simple cubic spin-1/2 Ising model. We find a new tricritical be havior of the interface magnetization depending on the strength of the ferromagnetic perpendicular exchange interaction between the spins at the interface and their neighbors in the next layers in the right and left sides. The magnetic behavior of an interface coupled antiferroma gnetically to the two sides is also examined.