pinpoint mode Gallium margarine NUS Chromium Modulus BismuthFerrite Microchannel ElectrostaticForceMicroscopy PFM LMF IIT-chennai STM HexacontaneFilm Array KPFM Etch YttriaStabilizedZirconia Scratch TemperatureControllerStage SKKU Patterns Step NeodymiumMagnets hard_disk GaAs semifluorinated_alkanes PVAC SmalScan Boron kelvin probe force microscopy F14H20 Aluminium_Oxide fifber Piezo