SThM BiVO4 HOPG frequency_modulation Wafer P3HT SmalScan C_AFM Vortex Boundary Inorganic_Compound LiNbO3 polymeric_arrays MembraneFilter PolycrystallineFerroelectricBCZT Mechinical Reading Granada AtomicSteps Change Conductivity Zhi Electical&Electronics Calcite Modulus Crystal IISCBangalore SoftSample DOE RedBloodCell LithiumNiobate amplitude_modulation atomic_steps LiquidCell SPMLabs