  In this study, the temperature dependencies of magnetic response functions of
the anhydrous dihalides of iron-group elements are examined in the neighborhood
of multi-critical points (tricritical, critical end point, double critical end
point) and first order transition temperatures within molecular field
approximation. Our findings reveal the fact that metamagnetic Ising system
exhibits anomalies in the temperature dependence of the magnetic response
functions for r<0.3. In addition, we extensively investigated how an inter- and
intra-layer exchange interaction ratio can influence magnetic response
properties of these systems. Finally, a comparison is made with related works.
