Structural and physical properties of ferroelectric and ferrimagnetic pulsed-laser deposition-grown thin-film BaFe xTi 1-xO 3 with 0.5≤x≤0.75 (BFTO) are compared with those of BaTiO 3 (BTO) films deposited under identical conditions. Fe leads to lattice expansion and deterioration of the crystalline quality in the as-prepared films. Signatures of the paraelectric-ferroelectric phase transition in lattice parameters, resistivity, and capacitance tend to be suppressed in BTO films, but are clearly distinguished in the presence of Fe. While strain elevates T C above bulk values in thin-film BTO to ∼200°C, Fe doping entails further increases of T C up to ∼320°C. Current versus voltage measurements demonstrate that Fe converts n-type BTO into p-type BFTO. Fe doping brings about ferrimagnetic ordering with a Néel temperature above 450°C.
ASJC Scopus subject areas
- Physics and Astronomy(all)