SThM ForceVolume PolyvinylideneFluoride Inorganic_Compound BismuthFerrite Ananth alkanes Domain tip_bias_mode TemperatureControlledAFM Regensburg PVAC Steps PS_PVAC Flake blended polymers aluminum_nitride SPMLabs Workfunction Scratch Oxide Ni81Fe19 AM_SKPM MagneticForceMicroscopy MESA structure CBD INSPParis VortexCore PMNPT Tin disulfide PolyStylene F14H20 CopperFoil Worcester_Polytechnic_Institute C_AFM