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Force displacement curve
This is a force-displacement curve, showing the change
in the force acting on the tip as it approaches and withdraws from the
surface.
The horizontal axis is the extension of the piezo in the z-direction.
The y-axis is the force experienced by the cantilever. Since force is calculated from Hooke's law: F = -kx, the y-axis can also be considered as cantilever deflection.
The horizontal axis is the extension of the piezo in the z-direction.
The y-axis is the force experienced by the cantilever. Since force is calculated from Hooke's law: F = -kx, the y-axis can also be considered as cantilever deflection.
Force displacement curve
When the tip is far away from
the sample, the cantilever hardly feels any force from the sample surface,
so the deflection is almost zero.
water layer adsorbed on surface
Sample