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Role of image forces in non-contact scanning force microscope images of ionic surfaces

Kantorovich, LN; Foster, AS; Shluger, AL; Stoneham, AM; (2000) Role of image forces in non-contact scanning force microscope images of ionic surfaces. Surface Science , 445 (2-3) 283 - 299. 10.1016/S0039-6028(99)01086-9. Green open access

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Abstract

We consider the effect of the image interaction on the force acting between tip and surface in non-contact scanning force microscope experiments. This interaction is relevant when a conducting tip interacts with either a polar bulk sample or with a thick film grown on a conducting substrate. We compare the atomistic contribution due to the interaction between the microscopic tip apex and the sample with the macroscopic van der Weals and image contributions to the force on the tip for several representative NaCl clusters adsorbed on a metal substrate. We show that the microscopic force dominates above the plain (001) terrace sites and is solely responsible for image contrast. However, the image force becomes comparable to the microscopic force above the surface di-vacancy and dominates the interaction above a charged step. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

Type: Article
Title: Role of image forces in non-contact scanning force microscope images of ionic surfaces
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/S0039-6028(99)01086-9
Publisher version: http://dx.doi.org/10.1016/S0039-6028(99)01086-9
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012
Keywords: AFM, construction and use of effective interatomic interactions, insulating films, metal-insulator interfaces, NaCl, surface defects, TUNNELING MICROSCOPE, ATOMIC-RESOLUTION, POINT-CHARGE, MODEL, TIPS, STM, AFM
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/153683
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