Pascal Steiner et al 2009 Nanotechnology 20 495701 doi:10.1088/0957-4484/20/49/495701
Pascal Steiner, Raphael Roth, Enrico Gnecco, Thilo Glatzel, Alexis Baratoff and Ernst Meyer
Show affiliationsNovel phenomena accompanying atomic-scale friction are studied on NaCl(001) by the combination of quasistatic lateral force measurements with dynamic measurements of contact resonance frequencies. For loads up to a few nN the flexural resonance is tracked by a phase-locked-loop by the use of small oscillation amplitude (50 pm). The contact resonance varies during the stick stages, which demonstrates that the dynamic measurement provides additional information about small changes of the stressed contact. Improved sensitivity is also observed across atomic-scale defects which are clearly observed in the contact frequency channel. The low lateral contact stiffness inferred from the observed torsional resonance agrees well with that deduced from the quasistatic measurements and strongly suggests that the contact is atomic-sized.
68.37.Ps Atomic force microscopy (AFM)
81.40.Pq Friction, lubrication, and wear
07.79.Lh Atomic force microscopes
62.20.Qp Friction, tribology, and hardness
Instrumentation and measurement
Surfaces, interfaces and thin films
Issue 49 (9 December 2009)
Received 31 July 2009, in final form 18 September 2009
Published 6 November 2009
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