Combined effects of bilayer structure and ion substitutions on bismuth ferrite thin films

To understanding the combined effects of bilayer structure and ion substitutions on electrical behavior of BiFeO3 thin films, the Bi0.90La0.10Fe0.90Zn0.10O3/Bi0.90La0.10Fe0.90Sn0.10O3 bilayers with different thickness ratios were fabricated on SrRuO3/Pt/TiO2/SiO2/Si(100) substrates by radio frequency sputtering. Their dielectric constant increases and the fatigue endurance becomes better with increasing Bi0.90La0.10Fe0.90Zn0.10O3 thickness ratios. The bilayer with the thickness ratio of 210: 90 exhibits a high remanent polarization, and a better fatigue behavior is induced by higher driving electric fields and frequencies.