Small metal-free organic molecules on an epitaxial graphene monolayer are shown to receive a local magnetic moment from the substrate. This magnetic moment survives when many molecules combine to form a layer, with some indication of long-range ferromagnetic order.
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Reinert, F. Graphene gets molecules into order. Nature Phys 9, 321–322 (2013). https://doi.org/10.1038/nphys2643
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DOI: https://doi.org/10.1038/nphys2643