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piezoelectric force microscopy StrontiumTitanate DataStorage Writing Sapphire Hole SiWafer suspended_graphene Jason mfm_amplitude temperature controller AFM molecule Metal PolyStylene Etch Polypropylene HfO2 atomic_steps PVAP3HT vertical_PFM SKKU #Materials CopperFoil gallium_nitride molecular_self_assembly BiVO4 FAPbI3 Piranha Silicon PhaseImaging StyreneBeads Copolymer Worcester_Polytechnic_Institute Electical&Electronics CntFilm