Ferromagnetism of Mn-N-4 architecture embedded graphene

The realization of intrinsic two-dimensional (2D) magnetic materials with high Curie temperature is one of the prevalent research directions in spintronics. Here, a 2D ferromagnet of Mn-N-4 embedded graphene is reported, where the single Mn atom dispersed Mn-N-4 structure is confirmed by extended x-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy results. Magnetic measurements demonstrate that the Mn-N-4 embedded graphene exhibits robust room-temperature ferromagnetism, and the x-ray magnetic circular dichroism results reveal that the magnetic moments come from the embedded Mn atoms. Furthermore, using first-principle calculations, we demonstrate that the Mn-N-4 architecture is the source of the magnetism and the long-range magnetic ordering is favored in such coordination systems.