Effects of La-doping on structural, electrical and multiferroic properties of Bi6Fe2Ti3O18 thin films

Chinnambedu Murugesan Raghavan, Jin Won Kim, Ji Ya Choi, Sang Su Kim*, Jong Woo Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Bi6Fe2Ti3O18 (BFTO) and La-doped Bi6−xLaxFe2Ti3O18 (BLFT) (x = 0.03; BLFT3, x = 0.06; BLFT6 and 0.09; BLFT9) thin films were prepared on Pt(111)/Ti/SiO2/Si(100) substrates by using a chemical solution deposition method. All thin films were crystallized in a polycrystalline orthorhombic structures confirmed by X-ray diffraction and Raman spectroscopy. A low order of leakage current density 2.05 × 10−4 A/cm2 and improved ferroelectric properties, such as large remnant polarization (2Pr) of 19.5 μC/cm2 with low coercive filed of 300 kV/cm at an applied electric field of 410 kV/cm, were observed for the BLFT6 thin film. The improved properties for the BLFT thin films were correlated to the reduction of oxygen vacancies, the structural distortion and the stabilization of perovskite structures by the La-ion doping into the Bi-site of the BFTO. At room temperature, the BLFT6 and the BLFT9 thin films showed ferromagnetism, while the BFTO and the BLFT3 thin films showed anti-ferromagnetism.

Original languageEnglish
Pages (from-to)83-90
Number of pages8
JournalJournal of Sol-Gel Science and Technology
Volume73
Issue number1
Early online date17 Sep 2014
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • BiFeTiO
  • Chemical solution deposition
  • Electrical properties
  • Multiferroic properties

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