ContactModeDots DNA Heating TemperatureControllerStage Layer Fe_film BTO PhaseTransition Mapping PinpointNanomechanicalMode Bismuth Ni81Fe19 semifluorinated alkane Film Celebration PetruPoni thermoplastic_elastomers Materials HexagonalBN piezoelectric force microscopy FrictionForce Non-ContactMode FM_SKPM Composition CarbonNanotube exfoliate Wang Sidewall Polypropylene Ptfe Titanate Oxidation Thermoplastic_polyurethane Steps Bacterium