SmalScan CaMnO3 Chungnam_National_University mfm_amplitude Calcite self_assembly China TappingMode PiezoelectricForceMicroscopy plastics FFM Mfm NeodymiumMagnets LiBattery Ptfe Optic Subhajjit Korea Multiferroic_materials Sidewall FAPbI3 AEAPDES fe_nd_b BiasMode Chrome Dental Electrode Kevlar Crystal HBN INSP Polarization VerticalPFM Imprint CP-AFM