ring shape PyroelectricDetector gallium_nitride Sic SurfaceOxidation Vanadate University_of_Regensburg MoS2 CancerCell doped flakes Hysteresys Wang Lateral_Force_Microscopy Defects IISCBangalore hard_disk_media mechanical_property ForceDistanceSpectroscopy Tape Led PolymerPatterns Multiferroic_materials 2d_materials Neodymium LiBattery GaP WWafer Foil DNAProtein HydroGel Boundary Protein AM_KPFM dielectric_trench