Presentation Information
[3G02]Characteristics of dynamic stiffness of cantilever under torsional oscillation
*Keita Nishida1, Yuuki Yasui1, Yoshiaki Sugimoto1 (1. Graduate School of Frontier Sciences, The University of Tokyo)
Lateral force measurement reveals additional information on the local properties of the sample surface, such as interatomic friction. One of the ways to measure lateral force is to use Si cantilevers in torsional oscillation. However, the dynamic stiffness of the cantilever in torsional oscillation is still not clear, though it is essential for quantitative measurement of lateral force. The cantilever is modelled as a continuous medium, and its torsional equation of motion was solved to clearly describe the dynamic stiffness. The results indicated that the dynamic stiffness is larger than the static stiffness, and the dynamic moment of inertia is smaller than that of the cantilever. We will discuss how the static stiffness of the cantilever is modified under torsional oscillation and compare the dynamic stiffness with those in other oscillation modes.