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Sapphire self_healing CalciumHydroxyapatite HfO2 PinpointPFM Nickel Step Electrical&Electronics PhthalocyaninePraseodymium Sidewall Switching PDMS PolyimideFilm Cobalt-dopedIronOxide FrequencyModulation SurfaceOxidation HardDisk PetruPoni_Institute Metal Imprint PhaseChange Insulator Iron STM Varistor Galfenol UnivOfMaryland NtuEee Dental dichalcogenide Tapping Tin sulfide UnivMaryland GaN Piezoresponse