mechanical_property cross section Conductivity Reduction heterojunctions BiFeO3 PFM Indent Nanotechnology IMT_Bucharest HexagonalBN Workfunction Jason LightEmiting SThM HiVacuum Boundary Adhesive Water LFM SKPM Worcester_Polytechnic_Institute Bio Growing VinylAlcohol LiBattery SicMosfet IIT-chennai FM-KPFM GaP Polarization UnivOfMaryland CuSubstrate Multiferroic_materials CalciumHydroxyapatite