VerticalPFM piezoelectric force microscopy BTO Dr.JurekSadowski Stiffness dielectric_trench DOE Pvdf ferromagnetic atomic_steps TempControl StyreneBeads Cancer Polyethylene Blood suspended_graphene MechanicalProperty Growth CancerCell TappingMode Magnetic SrO temperature_control Phase HighResolution mono_layer Gallium SThM Potential self_healing ConductingPolymer 3-hexylthiophene STO ScanningIon-ConductanceMicroscopy Melt