Abstract
A novel method for identifying the adhesion force and the dynamic elongation of molecularly thin lubricant coated over DLC surface was developed while an SPM tip retracting from contact position. This method successfully utilizes transient response of the SPM cantilever arising after separation. To describe experimental transient response, a new model for separation process was introduced wherein the surface force decreases from an initial value (contact force) to a terminal value (separation force) in proportion to the tip travel accompanying elongation of the lubricant. Calculated vibration waveforms using this model were found to be in good agreement with observed waveforms.
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