Photovoltaics Spain BiasMode 2d_materials Gallium_Arsenide Magnetic Force Microscopy PolymerBlend Dental Tapping Ni81Fe19 Praseodymium Potential piezoelectric force microscopy PUR NiFe Pinpoint PFM FM_SKPM Wang HexagonalBoronNitride Monisha Composition aluminum_nitride CopperFoil self-assembled_monolayer ContactMode Ferrite graphene_hybrid silicon_oxide CalciumHydroxyapatite FAPbI3 Resistance KevlarFiber ScanningTunnelingMicroscopy Self-assembledMonolayer Optoelectronic