ForceMapping Alloy India Multiferroic_materials HexagonalBoronNitride PinPointMode Mechanical Piezoresponse ContactModeDots PolyimideFilm FM_KPFM MfmAmplitude CaMnO3 Moire ReflexLens SiliconOxide Edwin Gold OrganicCompound Friction Force-distance Vacuum Celebration ConductiveAFM aluminum_nitride PhaseImaging YszSubstrate fluorocarbon oxide_layer HfO2 CuParticle FM-KPFM C36H74 Steps Wonseok