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Dynamic force microscopy of copper surfaces : atomic resolution and distance dependence of tip-sample interaction and tunneling current

Loppacher, C. and Bammerlin, M. and Guggisberg, M. and Schar, S. and Bennewitz, R. and Baratoff, A. and Meyer, E. and Guntherodt, H. J.. (2000) Dynamic force microscopy of copper surfaces : atomic resolution and distance dependence of tip-sample interaction and tunneling current. Physical Review B, Vol. 62, H. 24. pp. 16944-16949.

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Official URL: http://edoc.unibas.ch/dok/A5262151

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Abstract

Atomic resolution images of Cu(lll) and Cu(100) surfaces obtained in ultrahigh vacuum with a combined scanning tunneling (STM)/atomic force microscope (AFM) are presented. Scan lines recorded in the noncontact AFM mode and the constant current mode show enhanced corrugation similar to STM experiments. Frequency shift versus distance curves are analyzed to determine the forces between probing tip and sample using the force separation method. The short-range chemical forces are in good agreement with an exponential law. The decay lengths of these chemical forces are found to be twice as large as the decay length of the tunneling current, as predicted by a simple theoretical model. However, both lengths are significantly larger than expected for metallic adhesive interactions.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:0163-1829
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:48

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