Lift Scratch SKKU DomainSwitching Piezoelectric pinpoint mode IIT-chennai Film gallium_nitride StyreneBeads UTEM Perovskite YszSubstrate SmalScan Defect ScanningTunnelingMicroscopy SrO Hydroxyapatite F14H20 HighAcpectRatio polymeric_arrays Conductive AFM Mechanical&nanotechnology Pattern Polarization Polyimide Polystyrene Step PANI EPFL CNT Biology ContactMode molecules Sadowski