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Study of electronic and magnetic propertiesof cobalt nanoclusters on graphite

We investigated the combination of cobalt (Co) and highly ordered pyrolytic graphite (HOPG) for spintronic 
applications. We deposited Co on HOPG in UHV to study its growth, and to characterize the interfacial electronic and magnetic properties. In our study, we remained in the nucleation-dominated regime with Co coverage below 5%, as characterized by scanning tunneling microscopy (STM). We observed individual Co ad-atoms initially sitting at the β-sites of the graphite surface lattice, and subsequently filling the other sites to form nanoclusters. The Co nanoclusters growth was found to follow the Volmer-Weber mode, independent of deposition time. The mean diameter and height of the isolated nanoclusters are 3.4 ± 0.2 nm and 0.49 ± 0.045 nm respectively. The aspect ratio of the nanoclusters, defined as height divided by diameter (h/d), is ~ 0.15.