Ferromagnetism in nanomesh graphene

A nanomesh graphene (NMG) was produced by a chemical vapor deposition using porous MgO layers as templates, and its magnetic properties were measured and compared with those of reduced graphene oxide (rGO). Extraordinary ferromagnetism with a saturation magnetization of 0.04 emu/g at room temperature was found in the NMG, four times of that of rGO (0.01 emu/g). The mesh structure with remarkable corrugations indicates the possible existence of a high density of defects in the NMG, which is believed to contribute to the origin of the ferromagnetism. Our results present a direct connection between the mesh structure and the ferromagnetism, which provides valuable clues to explore the essential origination of carbon magnetism.