mechanical property Sphere Carbon PhthalocyaninePraseodymium align HfO2 ScanningTunnelingMicroscopy FAPbI3 Vacuum SAM LiftMode PhaseImaging Hexylthiophene AAO Korea SrTiO3 Perovskite DomainSwitching SICM FrictionalForce PpLdpe #Materials CrAu Temasek_Lab dielectric_trench Styrene Genetic Patterns #EC MagneticForceMicroscopy ItoGlass UnivMaryland Bismuth mfm_amplitude tip_bias_mode