Electrical properties of calcium doped BiFeO3 films on LaNiO3 coated Pt substrates

Abstract

Pure and calcium-modified (Ca x Bi 1-x FeO 3 , x = 0.0, 0.1, 0.2, 0.30) thin films were fabricated on Pt(111)/Ti/SiO 2 /Si substrates by the soft chemical method using LaNiO 3 as the bottom electrode. Highly (200)oriented BFO film was coherently grown on LNO at 500°C. Ca-doped BiFeO 3 films have a dense microstructure and rounded grains. The conventional problem of the leakage current for the highest doped film was reduced from 10-5 to 10-10 with remarkable improvement in the film/electrode interface, chemical homogeneity, crystallinity, and morphology of the BFO film. Enhanced ferroelectricity was observed at room temperature due to the bottom electrode. Fatigue-free films were grown on LaNiO 3 bottom electrodes with no degradation after 1×10 10 switching cycles at an applied voltage of 5 V with a frequency of 1 MHz. After several tests the capacitors retained 77% of its polarization upon a retention time of 10 4 s. Room temperature magnetic coercive field measurements indicate that the magnetic behaviour is influenced by the nature of the bottom electrode.