Current-Induced One-Dimensional Diffusion of Co Adatoms on Graphene Nanoribbons.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34652923.
- Also identified by DOI 10.1021/acs.nanolett.1c03073 and PMC identifier 8554795.
- Licence recorded as CC BY-NC-ND.
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Abstract
One-dimensional diffusion of Co adatoms on graphene nanoribbons has been induced and investigated by means of scanning tunnelling microscopy (STM). To this end, the nanoribbons and the Co adatoms have been imaged before and after injecting current pulses into the nanoribbons, with the STM tip in direct contact with the ribbon. We observe current-induced motion of the Co atoms along the nanoribbons, which is approximately described by a distribution expected for a thermally activated one-dimensional random walk. This indicates that the nanoribbons reach temperatures far beyond 100 K, which is well above the temperature of the underlying Au substrate. This model system can be developed further for the study of electromigration at the single-atom level.