Hysteresys Co/Cr/Pt Croatia kelvin probe force microscopy Cell Techcomp Chrome ElectroChemical Sidewall MonoLayer conductive Leakage hard_disk polyvinyl acetate #EC NTU UTEM Conduct Vac Solution Au111 Polyethylene flakes Deposition Bacterium silicon_oxide H-BN EFM NiFe dielectric_trench PinpointPFM Memory FrequencyModulation AM_SKPM MoS2