Thermoplastic_polyurethane Mechanical Ni-FeAlloy HafniumDioxide SingleCrystal CancerCell LFM molecules frequency_modulation YszSubstrate ring shape NTU Gallium_Arsenide Tin sulfide Holes Bacterium pinpoint mode FM_KPFM TungstenThinFilmDeposition PUR Hafnium_dioxide Dimethicone HumanHair Vacuum PVAC fluoroaalkane FFM PolyvinylideneFluoride lithography Polymer Annealing Defects PECurve PhaseImaging UnivCollegeLondon