HumanHair Beads PpLdpe Sulfur Topography CalciumHydroxide PECurve Magnetic Force Microscopy Laser Gallium_Arsenide GaN fluoroalkane University_of_Regensburg Edwin OxideLayer ForceDistanceSpectroscopy Pattern VerticalPFM hydrocarbon PANI Gold Insulator Chemical_Vapor_Deposition Pinpoint PFM Calcite NusEce Melt Oxide Plug Non-ContactMode molecular_beam NUS_NNI_Nanocore BCZT 2dMaterials vertical_PFM