Tunable dimer systems of cobalt atoms on phosphorene

Abstract

In this work we report on a comprehensive study of a dimer system, two cobalt atoms on phosphorene surface. Since each cobalt atom can be stabilized in high- and low-spin states, the couplings in this dimer system can be tuned. More specifically, it was shown that applying a small bias voltage one can change interaction between two atoms within dimer from ferro-magnetic to antiferromagnetic and vice versa.