Cross-section Gold Copper Christmas Holes ForceVolumeMapping PolycrystallineFerroelectricBCZT FastScan SThM ConductiveAFM piezoelectric force microscopy Subhajjit Mfm Chrome fluorocarbon TungstenThinFilmDeposition tip_bias_mode Device Flake IndiumTinOxide ForceVolumeImage Molybdenum_disulfide mechanical property Lateral non_contact Celebration FAFailureAnlaysis HDD Leakage Current DeflectionOptics cross section Global_Comm NtuEee Conducting