Friction and PFM
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Has anyone seen a correlation between friction forces and the charge state on a surface (i.e., a correlation between a PFM image and a friction image)? It seems reasonable to expect that these could be related due to the increased adhesion (and contact area, and thus friction) that one might expect over a charged region due to polarization interactions.
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There was a paper by Salmeron group on friction vs doping in semiconductors. These are probably related. In PFM, a lot of early work was friction detection of domains in TGS, but eventually the contrast was attributed to surface chemistry differences as mediated by polarization.
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In one of the first papers on SPM of ferroelectrics by Luthi et al, they observed domain contrast in the friction mode, which they attributed to the electrostatic intraction between polarization charges and induced charges in the tip. PFM did not exist at that time and after it was developed LFM imaging became less useful, so no direct comparison has been made as far as I know.
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The problem will be distinguishing chemically-mediated contrast vs. physical polarization effects.