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Metal PFM Wonseok #EC contact flakes AmplitudeModulation FFM HBN MfmAmplitude StrontiumTitanate Crystal FuelCell Beads LiquidCell NCM\ Techcomp DNA FrictionalForceMicroscopy CntFilm AnodizedAluminumOxide Polyvinylidene_fluoride Layer INSP Gong MagneticForceMicroscopy SFAs Defects PolyvinylAcetate Permalloy UnivOfMaryland tip_bias_mode China LiftMode NTU