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Epitaxial growth of BiFeO3 thin films by LPE and sol–gel methods

2004; Elsevier BV; Volume: 283; Issue: 2-3 Linguagem: Inglês

10.1016/j.jmmm.2004.06.014

1873-4766

Xiaoding Qi, Joonghoe Dho, M. G. Blamire, Q. X. Jia, Jang‐Sik Lee, S. J. Foltyn, Judith L. MacManus‐Driscoll,

Advanced Condensed Matter Physics

Epitaxial BiFeO3 thin films have been grown on the (0 0 1) SrTiO3 and LaAlO3 substrates by liquid phase epitaxy (LPE) and sol–gel methods. The films had an in-plane texture of 2° and out-plane texture of 0.6° and showed a 4-fold symmetry about the c-axis, indicating a distortion of the bulk rhombohedral cell to a tetragonal or cubic structure. The LPE films were both ferroelectric and ferromagnetic. The sol–gel films showed a small linear increase of the magnetisation with the applied magnetic field, indicating they possibly had the same antiferromagnetic behaviour as the bulk crystal. The LPE films exhibited a large leakage current, which probably originated from a relatively high level of Fe2+ in the films induced by the high growth temperature. Fe2+ might also account for the origin of the ferromagnetism in LPE films.