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

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Goncalves, L. F. [UNESP]
Rocha, L. S. R. [UNESP]
Hangai, B. [UNESP]
Silva Ortega, Pedro Paulo [UNESP]
Longo, E. [UNESP]
Simoes, Alexandre Z. [UNESP]
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Univ Novi Sad, Fac Technology
Pure and calcium-modified (CaxBi1-xFeO3, x = 0.0, 0.1, 0.2, 0.30) thin films were fabricated on Pt(111)/Ti/SiO2/Si substrates by the soft chemical method using LaNiO3 as the bottom electrode. Highly (200)-oriented BFO film was coherently grown on LNO at 500 degrees C. Ca-doped BiFeO3 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 LaNiO3 bottom electrodes with no degradation after 1x10(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.
bismuth ferrite, multiferroics, lanthanum nickelate, thin films
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Processing And Application Of Ceramics. Novi Sad: Univ Novi Sad, Fac Technology, v. 12, n. 2, p. 153-164, 2018.