Calculated surface stiffness and tip penetration

Table IL Calculated surface stiffness and tip penetration depths for several materials using a silicon nitride cantilever (ks0.58N/m, tip radiuss40 nm) and...

Equation 2 gives the penetration depth, equation 3 gives the surface stiffness and equation 4 is the calculated effective modulus based on bulk modulus, E, and Poisson s ratio, v. We have applied this analysis to our materials to calculate the surface penetration and surface stiffness using the measured radius of our tip and the known bulk mechanical constants of the materials at an applied load of 50 nN (Table II). 

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