▎ 摘　　要

A suspended layer made up of ferromagnetically ordered spins could be created between two-monolayer or multilayer graphene through intercalation. Stability and electronic structure studies show that, when flu-orine molecules are intercalated between two mono/multilayer graphene, their bonds get stretched enough (similar to 1.9-2 . 0 angstrom) to weaken their molecular singlet eigenstate. Geometrically, these stretched molecules form a pseudoatomized fluorine layer by maintaining a van der Waals separation of similar to 2.6 angstrom from the adjacent carbon layers. As there is a significant charge transfer from the adjacent carbon layers to the fluorine layers, a mixture of triplet and doublet states stabilizes to induce local spin moments at each fluorine site and in turn form a suspended two-dimensional spin lattice. The spins of this lattice align ferromagnetically with nearest-neighbor coupling strength as large as similar to 100 meV. Our finite-temperature ab initio molecular dynamics study reveals that the intercalated system can be stabilized up to a temperature of 100 K with an average magnetic moment of similar to 0.6 mu(B)/F. However, if the graphene layers can be held fixed, the room-temperature stability of such a system is feasible.