Beryllium chains interacting with Graphene Nanoislands: From anti-ferromagnetic to ferromagnetic ground state

► Applications of ab initio methods to nano-systems. ► Stabilization of linear systems with Graphene Nanoisland. ► Presence of a significant van der Waals minimum. ► Singlet-triplet quasi-degeneracy of the linear Beryllium chains is onserved upon interaction with the nano-structure. ► Passage from an anti-ferromagnetic to a ferromagnetic ground state with the distance from the nano-structure.