High Island Densities and Long Range Repulsive Interactions: Fe on Epitaxial Graphene

TitleHigh Island Densities and Long Range Repulsive Interactions: Fe on Epitaxial Graphene
Publication TypeJournal Article
Year of Publication2012
AuthorsBinz SM, Hupalo M, Liu XJ, Wang CZ, Lu WC, Thiel PA, Ho KM, Conrad EH, Tringides MC
Journal TitlePhysical Review Letters
Volume109
Pages026103
Date Published07
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000306417200010
Keywordsfilms, growth
Abstract

The understanding of metal nucleation on graphene is essential for promising future applications, especially of magnetic metals which can be used in spintronics or computer storage media. A common method to study the grown morphology is to measure the nucleated island density n as a function of growth parameters. Surprisingly, the growth of Fe on graphene is found to be unusual because it does not follow classical nucleation: n is unexpectedtly high, it increases continuously with the deposited amount theta and shows no temperature dependence. These unusual results indicate the presence of long range repulsive interactions. Kinetic Monte Carlo simulations and density functional theory calculations support this conclusion. In addition to answering an outstanding question in epitaxial growth, i.e., to find systems where long range interactions are present, the high density of magnetic islands, tunable with theta, is of interest for nanomagnetism applications.

URL<Go to ISI>://WOS:000306417200010
DOI10.1103/PhysRevLett.109.026103
Alternate JournalPhys. Rev. Lett.