  A suspended layer made up of ferromagnetically ordered spins could be created
between two mono/multilayer graphene through intercalation. Stability and
electronic structure studies show that, when fluorine molecules are
intercalated between two mono/multilayer graphene, their bonds get stretched
enough ($\sim$ 1.9$-$2.0 {\AA}) to weaken their molecular singlet eigenstate.
Geometrically, these stretched molecules form a pseudoatomized fluorine layer
by maintaining a van der Waals separation of $\sim$ 2.6 {\AA} 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
stabilize to induce local spin-moments at each fluorine sites and in turn form
a suspended 2D spin lattice. The spins of this lattice align ferromagnetically
with nearest neighbour coupling strength as large as $\sim$ 100 meV. Our finite
temperature \textit {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 $\sim$ 0.6 $\mu_{B}$/F. However, if the graphene
layers can be held fixed, the room temperature stability of such a system is
feasible.
