Magnetic properties in the Ising mixed spin-1/2–spin-1 superlattice

Abstract

An effective-field theory that accounts for the self-spin correlation function is used to derive the phase diagrams and magnetization curves of a magnetic superlattice, consisting of a mixed spin- 1/2–spin-1 (with a single-ion anisotropy D) alternate monolayers of ferromagnetic material. It is found that the phase diagrams exhibit a number of interesting phenomena resulting from the dependence of the crystal-field interaction. Both limit cases for very large positive and very large negative D reproduce respectively the T(3D)=5.07 and the T(2D)=3.08 Ising critical temperatures which are in agreement with earlier results. On the other hand, in particular, no tricritical point could be found. The magnetization curves are presented for a range of interaction strengths and D, respectively.