  Antiferromagnetism in stacked nanographite is investigated with using the
Hubbard-type models. The A-B stacking or the stacking near to that of A-B type
is favorable for the hexagonal nanographite with zigzag edges, in order that
magnetism appears. Next, we find that the open shell electronic structure can
be an origin of the decreasing magnetic moment with the decrease of the
inter-graphene distance, as experiments on adsorption of molecules suggest.
