NanoLithography Floppy ring shape ContactModeDots Ferrite LateralPFM PinpointNanomechanicalMode medical align DeflectionOptics polyvinyl acetate SRAM Hysteresys PolyvinylAcetate chemical_compound LogAmplifier HafniumDioxide FrequencyModulation Polarization Magnets ForceVolumeMapping PtfeMembrane SThM Alkane Fet PolyimideFilm HanyangUniv Wang Piranha alkanes ScanningSpreadingResistanceMicroscopy flakes AEAPDES Growth Trench