Document Type

Dataset

Dataset Type

figure_plot

Dataset Product Numbers

None

DEO Contract Number

DE-AC02-05CH11231

Originating Research Organization

Ames Laboratory (AMES), Ames, IA (United States)

Publication/Issue Date

2016

Language

English

Country of Publication

US

Sponsoring Organization(s)

SC-22 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Subject Categories

36 MATERIALS SCIENCE

Abstract

We have studied nucleation and growth of Dy islands on the basal plane of graphite at 300 K using scanning tunneling microscopy (STM), density functional theory (DFT) in a form that includes van der Waals interactions, and analytic theory. The interaction of atomic Dy with graphite is strong, while the diffusion barrier is small. Experiment shows that at 300 K, the density of nucleated islands is close to the value predicted for homogeneous nucleation, using critical size of 1 and the DFT-derived diffusion barrier. Homogeneous nucleation is also supported by the monomodal shape of the island size distributions. Comparison with the published island density of Dy on graphene shows that the value is about two orders of magnitude smaller on graphite, which can be attributed to more effective charge screening in graphite. The base of each island is 3 atoms high and atomically ordered, forming a coincidence lattice with the graphite. Islands resist coalescence, probably due to multiple rotational orientations associated with the coincidence lattice. Upper levels grow as discernible single-atom layers. Analysis of the level populations reveals significant downward interlayer transport, which facilitates growth of the base. This island shape is metastable, since more compact 3D islands form at elevated growth temperature.

DOI

10.17039/ameslab.dmse.2016.DS2/1240605

Dataset File Extension

.par, .tf0

Software needed to utilize dataset

STM Software (i.e. WSxM)

Dataset Size

153 MB

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