frequency_modulation FM_SKPM Iron Etch Conductive AFM TappingMode #EC cross section DataStorage PolymerBlend Bio Polyvinylidene_fluoride blended polymers BFO IISCBangalore Silicon GalliumPhosphide Laser IMT_Bucharest BTO Chungnam_National_University Ferroelectric Terrace semifluorinated alkane Hydroxyapatite Blend Stiffness Molybdenum small_scan Morphology Piranha AtomicLayer SICM Reading optoelectronics