Fet PiezoelectricForceMicroscopy Strontium membrane HDD polyvinyl acetate Non-ContactMode LeakageCurrent Oxidation Fe_film conductive Indium_tin_oxide kelvin probe force microscopy EPFL Moire FrictionalForce Bacterium silicon_carbide self_assembly self_healing layers BiasMode food CuFoil SiliconCrystal nanomechanical dielectric_trench ForceVolumeMapping PetruPoni_Institute AM-KPFM cooling Alloy InorganicCompound Sio2 Gallium_Arsenide