Let us consider an initial 3D system of nodes, each occupied by a single spin represented by the vector S, spaced apart by r (refer to Figure 1a). Our re-scaled system is now composed of a set of super-cells characterized by spin vector S’ and distances between them r’ (Figure 1b). The r’/r ratio defines an enlargement factor n which has a key meaning for further considerations. Each super-cell reflects the magnetic moment S’ of n3 spins located in the box of dimensions nr × nr × nr.