medical ForceMapping frequency_modulation temp Crystal InorganicCompound Co/Cr/Pt C_AFM Cancer CNT FM-KPFM NUSNNI small_scan LithiumNiobate Galfenol Tungsten Workfunction nanobar suspended_graphene Pinpoint PFM SrTiO3 chemical_compound Friction Polymer BoronNitride STO Defects Piezoresponse membrane Adhesive Oxide Christmas atomic_layer SKPM Optic