pinpoint mode PetruPoni_Institute SPMLabs Sapphire Defects Sio2 FailureAnlaysis vertical_PFM HfO2 Etch Molybdenum_disulfide aluminum_nitride Potential Polyaniline PMNPT TappingMode Deposition BlockCopolymer Nickel Composite biocompatible Heating Vortex CuSubstrate Pores Tin disulfide I-VSpectroscopy LiftHeight BiasMode Zhi VortexCore CntFilm Copolymer NCM\ ContactModeDots