Optical IVSpectroscopy atomic_steps BismuthVanadate BismuthFerrite multi_layer tip_bias_mode Lateral temperature controller AFM Polyethylene Microchannel HighResolution LDPE FM_KPFM ring shape Semiconductor pinpoint mode DiffractiveOpticalElements Film HydroGel Cobalt-dopedIronOxide Force-distance lithography Jason Inorganic_Compound GranadaUniv PpLdpe GaP BCZT LateralForce Flake Co/Cr/Pt Epoxy Collagen Ito