Precise force curves in air and liquid by magnetic force feedback

Abstract

Articles you may be interested inOn eigenmodes, stiffness, and sensitivity of atomic force microscope cantilevers in air versus liquids A simple modification of a commercial atomic force microscopy liquid cell for in situ imaging in organic, reactive, or air sensitive environments Rev.We developed an atomic force microscopy with the tip position was accurately controlled through the magnetic interaction between a coil and the magnet fixed behind the cantilever. By incorporating a feedback system, we could control the motion of a soft cantilever ͑0.68 N/m͒ in air and liquid, and obtain force curves without instabilities originating from the strong attractive and adhesive forces between the tip and the sample.

A preliminary investigation of the potential mechanical sensitivity of vertical comb drives

“…Force-compensation mechanisms for measuring interfacial forces have been added to atomic force microscopes. In some cases a permanent magnet has been attached to the tip of the cantilever while a current has been run through a coil positioned near it, creating a magnetic field around the cantilever [9][10][11][12][13][14][15][16]. In other cases a magnetostrictive film has been deposited on top of the cantilever, which exerts a bending moment on it as the film changes its length under a similarly-applied magnetic field [17].…”