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atomic_layer Friction BiFeO3 Vortex CalciumHydroxyapatite Logo Ferroelectric BTO EPFL FrequencyModulation CuParticle polyvinyl acetate Tungsten Sapphire sputter Hexylthiophene Pvdf PetruPoni Gong Polarization Molybdenum_disulfide FrictionalForceMicroscopy AM_KPFM hetero_structure DLaTGS BCZT Bmp self_assembly ConductingPolymer Fe_film fifber gallium_nitride PolyvinylAcetate frequency_modulation C36H74