  Generating spintronic devices has been a goal for the nano-science. We have
used density function theory to determine magnetic phases of single layer and
bilayer lithium doped graphene nanoflakes. We have introduced graphene flakes
as single molecular magnets, spin on/off switches and spintronic memory
devices. To aim this goal, adsorption energies, spin polarizations, electronic
gaps, magnetic properties and robustness of spin-polarized states have been
studied in the presence of dopants and second layers. We find that for bilayer
SMMs with two layers of different sizes the highest occupied molecular orbital
and the lowest unoccupied molecular orbital switch between the layers. Based on
this switch of molecular orbitals in a bilayer graphene SMM, spin on/off
switches and spintronic memory devices could be achievable.
