VerticalPFM PVA ForceMapping EFMAmplitude SThM NanoLithography HDD NiFe Composite Zhi non_contact 2d_materials conductive Formamidinium_lead_iodide frequency_modulation Mapping BismuthFerrite LaAlO3 EPFL DentalProsthesis CuParticle ThermalDetectors hard_disk_media DataStorage Tapping ElectrostaticForceMicroscopy norganic TransitionMetal PinpointPFM Logo Steps PhaseChange Tape Sio2 Optoelectronic