CHOICE OF THE OPTIMAL CONDITIONS FOR SCANNING PROBE MICROSCOPY AND PHASE IMAGE INTERPRETATION AS APPLIED TO FRICTION SURFACES

摘要

The effect of bulk and surface properties of sample as well as the influence of friction-modified layer thickness on the probe-sample approach and phase values were analyzed for a short-term contact regime by the numerical simulation method. It is shown that for a given regime there is a correlation between phase and force corresponding to the maximum approach during a period of the cantilever oscillation. A vector diagram is presented to explain the phase shift mechanism for various ratios between conservative and dissipative forces acting in the system. It illustrates the conclusion that the internal friction affects the phase contrast formation. Based on the numerical calculation, we use the approach as a function of dynamic parameters of the system for estimating preliminarily the method accuracy. The maximum interaction force in the probe-sample system was found dependent on the force microsensor parameters and sample properties. The dependence can be used to predict the system state.