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

Autor(es)

Goncalves, L. F. ^[1] ; Rocha, L. S. R. ^[1] ; Hangai, B. ^[1] ; Silva Ortega, Pedro Paulo ^[1] ; Longo, E. ^[2] ; Simoes, Alexandre Z. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Unesp, Sch Engn, Guaratingueta - Brazil

^[2] Sao Paulo State Univ, Inst Chem, Unesp, Araraquara - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PROCESSING AND APPLICATION OF CERAMICS; v. 12, n. 2, p. 153-164, 2018.
• Citações Web of Science: 0

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. (AU)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs