Abstract
In this paper we use simulations to investigate the role of the tip in nc-AFM measurementsof dissipated energy. Using a virtual AFM we simulate the experiment focusing on theatomic scale energy dissipation on an NaCl(100) flat surface. The non-conservativeinteraction was treated with the theory of dynamic response and all the calculations werecarried out using an atomistic model; several sets of tips were tested using ionic crystals(NaCl, KBr, MgO), each in different configurations (ideal, vacant, divacant, doped). Usingan MgO-doped tip we were able to calculate a dissipation signal comparable to what istypically measured in experiments. It was not possible to see any dissipation with idealtips, although they still have a significant interaction with the surface and giveatomic contrast in the frequency shift signal. The effect of the scanning speedon measured frequency shift and dissipation is also calculated and discussed.
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