Atomically resolved edges and kinks of NaCl islands on Cu(111): Experiment and theory

R. Bennewitz*, A. S. Foster, L. N. Kantorovich, M. Bammerlin, Ch. Loppacher, S. Schär, M. Guggisberg, E. Meyer, A. L. Shluger

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

185 Citations (Scopus)

Abstract

Atomically resolved dynamic force microscopy (DFM) images of step and kink sites of NaCl films grown on the Cu(111) surface are presented. Combining experimental results with an atomistic modeling of DFM imaging, we study the mechanism of contrast formation and extract more information about the tip and NaCl film structure. The experimental results and theoretical modeling systematically demonstrate the enhanced interaction of step and kink sites of one kind with the tip. This is explained by the enhanced gradient of the electrostatic potential at low-coordinated surface sites, and considerable displacements of the step edge and kink atoms from their sites due to the interaction with the tip upon approach. The theoretical analysis predicts that the silicon tip is effectively an insulator, and that the NaCl island cannot be thicker than two monolayers. We discuss the shape and chemical structure of the tip and the mechanism of damping during DFM imaging.

Original languageEnglish
Pages (from-to)2074-2084
Number of pages11
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume62
Issue number3
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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