PiezoelectricForceMicroscopy vertical_PFM PyroelectricDetector IMT_Bucharest GlassTemp Change TipBiasMode WWafer Ni81Fe19 BismuthVanadate PinpointPFM GaP DeflectionOptics Thermal Spincast KPFM Techcomp Mfm CopperFoil Nanopattern Terrace FrictionalForce Dopped 3-hexylthiophene Aluminium_Oxide Nanofiber GaAs organic_polymer SKKU heterojunctions ForceMapping INSP CrAu Alloy atomic_steps