Ferroelectric Ni81Fe19 ConductiveAFM SFAs Pyroelectric CancerCell Polyvinylidene ScanningKelvinProbeMicroscopy PetruPoni_Institute LiBattery Laser Grain SICM polymeric_arrays Polyethylene HardDisk UTEM Vortex NiFe NUS VerticalPFM Temasek_Lab cannabis LithiumNiobate MeltingPoint AIN Spincast WPlug MagneticPhase Anneal NCM\ pinpoint mode Sidewall C_AFM biocompatible