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STM image of 28nm by 28nm area of the terraced copper and copper nitride surface where the IBM experiments were performed. The smooth flat surfaces are copper metal; the cross-hatched, slightly depressed areas are patches of insulating CuN, which were created by implanting a sub-monolayer amount of nitrogen and heating the surface. The scientists wanted both sufaces close to each other so they could easy test magnanese-atom structures on both the conducting and insulating surfaces. The visible humps on the surfaces are the manganese structures (1-10 atoms long)
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