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Schematic of the frequency shift, rectified frequency shift, and rectified frequency shift plus offset over displacement is given.
Plot of tunneling current (dashed line) and frequency shift (solid line) as a function of the displacement measured at sample voltages (a) , (b) , and (c) .
(a) FM-AFM image of MgO on Ag(001) with atomic resolution. Scan area 3.5 nm by 3.5 nm, , oscillation amplitude , approximately 13 pm corrugation. (b) The (001) growth model, schematic illustration of the configuration: Mg-atoms occupy hollow sites, i.e., they continue the Ag face-centered-cubic lattice , O atoms occupy on top sites. The Ag(001) surface unit cell is indicated.
FM-AFM image of MgO on Ag(001) with atomic resolution. The lower right part in each image shows the unfiltered raw data, the upper left part are low pass filtered. Scan area 1.5 nm by 1.5 nm, oscillation amplitude , (a) attractive regime , and (b) repulsive regime .
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