Sphere mechanical property pinpoint mode Resistance Wang polymeric_arrays STM DeoxyribonucleicAcid Conductance cooling PetruPoni fluorocarbon MBE AM-KPFM Roughness Lift VortexCore Perovskite Galfenol Aluminium_Oxide AM_KPFM PinpointNanomechanicalMode Formamidinium_lead_iodide OpticalModulator BCZT TemperatureControllerAFM Piezoresponse Co/Cr/Pt Cross-section flakes Alloy Alkane doped LateralForce ConductiveAFM