Terrace Polymer KPFM biocompatible CHRYSALIS_INC Pvdf sputter IMT_Bucharest bias_mode Anneal oxide_layer YttriaStabilizedZirconia Dopped MagneticForceMicroscopy SiWafer Bio MagneticArray Praseodymium Gallium Boundary Platinum LateralForce PtfeFilter Transparent NtuEee amplitude_modulation TemperatureControl Growth Lanthanum_aluminate DiffractiveOpticalElements H-BN ContactMode HanyangUniv nanobar hydrocarbon