Mechanism of magnetism in stacked nanographite - Theoretical study

Antiferromagnetism in stacked nanographite is investigated using the Hubbard-type model. The A-B stacking is favorable for the hexagonal nanographite with zigzag edges, in order that magnetism appears. 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. (Author)