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