Electrical properties of calcium doped BiFeO3 films on LaNiO3 coated Pt substrates
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Data
2018-01-01
Autores
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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Editor
Univ Novi Sad, Fac Technology
Resumo
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.
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Palavras-chave
bismuth ferrite, multiferroics, lanthanum nickelate, thin films
Como citar
Processing And Application Of Ceramics. Novi Sad: Univ Novi Sad, Fac Technology, v. 12, n. 2, p. 153-164, 2018.