Achieving High-Temperature Ferromagnetism by Means of Magnetic Ion Dimerization in the Graphene-like Mn₂N₆C₆ Monolayer

Magnetic two-dimensional materials have potential application in next-generation electronic devices and stimulated extensive interest condensed matter physics material fields. However, how to realize high-temperature ferromagnetism remains a great challenge physics. Herein, we propose an effective approach that the dimerization of magnetic ions can enhance exchange coupling stabilize ferromagnetism. Manganese carbonitride Mn$_2$N$_6$C$_6$ with planar monolayer structure is taken as example clarify method, which two Mn atoms are gathered together form ferromagnetic dimer further these dimers coupled overall material. In monolayer, near-room-temperature Curie temperature 272.3 K determined by solving Heisenberg model using Monte Carlo simulations method.