LeakageCurrent OpticalModulator Christmas layers Permalloy tip_bias_mode YttriaStabilizedZirconia SThM BiVO4 Fe_film MechanicalProperties PhaseImaging Multiferroic_materials Corrosion Galfenol SKPM rubber Annealed LMF silicon_oxide Piezoelectric China DiffractiveOpticalElements Al2O3 Worcester_Polytechnic_Institute ring shape OpticalWaveguides Solar OrganicCompound PS_PVAC ScratchMode F14H20 Sperm fe_nd_b HexagonalBoronNitride