Crack resistance of bismuth ferrite films obtained on a flexible substrate

Ultrathin BiO x and FeO layers were obtained by Atomic Layer Deposition (ALD) on the surface of a flexible Kapton substrate (poly (4,4’-oxydiphenylene-pyromellitimide)) at temperature 250 °C. The layer thickness was 50 - 100 nm. Surface morphology, electrical polarization, mechanical properties investigated Force Microscope, Piezoelectric Microscopy Modulation Microscopy. Chemical analysis performed X-ray Photoelectron Spectroscopy, where formation Bi2O 3 Fe2O phases, as well intermediate phases in Bi-Fe-O system, observed. With small increase Bi content film, BFO / structure becomes more crack resistant. Modification with bismuth iron oxides showed that such composition exhibits multiferroic behavior.