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Force Imaging
Force Calibration Mode
Rev. D Dimension 3100 Manual 209
13.2.1 Example Force Plot
A Contact Mode AFM force plot using a silicon nitride tip is the most simple SPM force plot.
Because of the lower spring constant of silicon nitride tips, they are very sensitive to attractive and
repulsive forces. A force plot in Contact Mode AFM is shown in Figure 13.2d.
Figure 13.2c compares portions of the force curve shown in Figure 13.2d to relative positions of the
tip and sample at seven points. The force curve represents the deflection signal for each complete
extension-retraction cycle of the piezo (Figure 13.2a). The Z scan rate parameter in the Main
Controls panel defines the rate at which the piezo completes an extension-retraction cycle (and
therefore the rate at which new curves are displayed).
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