Step mechanical_property Zhi AEAPDES chemical_compound ULCA BlockCopolymer heterojunctions exfoliate LateralForceMicroscopy INSPParis BFO Fe_film SiliconOxide MagneticForceMicroscopy MagneticForce Magnetic Force Microscopy Dental Defect ferromagnetic India Phenanthrene SingleCrystal Inorganic VortexCore LiquidImaging CopperFoil Co/Cr/Pt FrictionalForceMicroscopy CuFoil Monisha MagneticPhase NUS University_of_Regensburg GaN