SSRM self-assembled_monolayer bias_mode Neodymium TappingMode Battery MESA structure PiezoelectricForceMicroscopy Writing epitaxy Subhajjit EvatecAG Chromium Modulus TransitionMetal KPFM TemperatureControl Flake norganic Graphene KevlarFiber LiftHeight nanomechanical IISCBangalore KAIST WS2 MechanicalProperty polyvinyl acetate Piezoresponse Fluoride BFO SiliconCrystal ScanningTunnelingMicroscopy self_assembly Optical