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Study of electronic and magnetic properties of cobalt nanoclusters on graphite

Leonardus, Lucky (2010) Study of electronic and magnetic properties of cobalt nanoclusters on graphite.

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Abstract: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.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Nanotechnology MSc (60028)
Link to this item:https://purl.utwente.nl/essays/59793
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