piezoelectric force microscopy FrictionalForce lift_mode PvdfFilm mfm_amplitude neodymium_magnets fluoroalkane PMNPT SolarCell Fluoride FrictionForce LiftMode Implant dielectric trench SKPM PDMS PinpointNanomechanicalMode MagneticArray Pyroelectric BFO TemperatureControllerStage molecular_beam electrospinning ReflexLens Graphene self-assembly Calcite PetruPoni_Institute Cobalt EFMAmplitude ScanningSpreadingResistanceMicroscopy Varistor Wonseok Optical Electrical&Electronics