Fe-Fe adatom interaction and growth morphology on graphene

TitleFe-Fe adatom interaction and growth morphology on graphene
Publication TypeJournal Article
Year of Publication2011
AuthorsLiu XJ, Wang CZ, Hupalo M, Lu WC, Thiel PA, Ho KM, Tringides MC
Journal TitlePhysical Review B
Volume84
Pages235446
Date Published12
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000298559600023
Keywordsaugmented-wave method, metals
Abstract

The nucleation and growth of Fe on graphene is highly unusual. A constantly increasing island density indicates the presence of strong, predominantly repulsive, adatom interactions. We study these interactions by first-principles calculations to identify their origin. We find that the interactions consist of a short-range attraction and longer-range repulsion. We show that electric dipole-dipole interaction can contribute only part of the repulsive force (similar to 30%) between Fe adatoms, and the repulsion due to the elastic interaction is small. We suggest that the dominant contribution to the repulsive energy would originate from the indirect (or RKKY) interactions mediated through the delocalized electrons on graphene.

URL<Go to ISI>://WOS:000298559600023
DOI10.1103/PhysRevB.84.235446
Alternate JournalPhys. Rev. B