NTU CuSubstrate YszSubstrate TipBiasMode cross section TungstenDeposition TiO2 PhthalocyaninePraseodymium HACrystal Sadowski CBD Butterfly Sic Kevlar LiftMode Adhesive TemperatureControlledAFM Tungsten PolyvinylAcetate Switching HBN Bmp Film Polyimide Biofilm Austenite NiFe bias_mode vertical_PFM Subhajjit Hexylthiophene ItoGlass SetpointMode Fe_film Iron