ContactModeDots Bismuth OpticalWaveguide VerticalPFM Heat LaAlO3 Growing BiVO4 PiezoelectricForceMicroscopy HexagonalBoronNitride bias_mode Permalloy MLCC ForceVolumeImage LiquidImaging HOPG Polyimide Beads SmalScan ConductingPolymer atomic_steps SKPM STO H-BN Pore neodymium_magnets NtuEee mfm_amplitude Tapping Filter GaP Boron Regensburg HydroGel SrTiO3