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Force interaction between a W tip and Si(111) investigated under ultrahigh vacuum conditions
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
2000 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 62, no 20, 13680-13686 p.Article in journal (Refereed) Published
Abstract [en]

The force on a W tip has been measured in ultrahigh vacuum during approach and indentation against Si(111). The maximum separation where we detect an attractive force is 5 Å, which is within the range where wave-function overlap should occur. Calculating the van der Waals force using the sphere-flat geometry and a radius of 150 Å that we determine by scanning electron microscopy overestimates the force, while a cone-shaped tip apex is consistent with our results. After contact we observe discontinuous steps in the force curve in agreement with molecular-dynamics simulations. The stiffness of the junction increases during the first 5 Å after contact and stabilizes at ~25 N/m, which is approximately a factor of 3 lower than estimated from classical elasticity theory. The maximum adhesive force is ~5 nN. We also present a model that relates the dynamic behavior of the force-feedback controller to the formation of a connective neck over the tip-surface gap.

Place, publisher, year, edition, pages
2000. Vol. 62, no 20, 13680-13686 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47541DOI: 10.1103/PhysRevB.62.13680OAI: oai:DiVA.org:liu-47541DiVA: diva2:268437
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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Erlandsson, Ragnar

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