Formation of perovskite BiFeO3(001) films on refined Pt(111) electrode layer with reduced thickness on glass substrates

Abstract

Structure and ferroelectric properties of multiferroic BiFeO3 (001) films grown on Pt(111) buffer layer with thicknesses of 5–50 nm on glass substrate at 500 °C have been studied. (001) texture of the perovskite BiFeO3 (BFO) could be developed. Grain size and morphology of the BFO(001) films were closely related to those of Pt electrode although no epitaxial growth was evidenced. The optimized BFO layer which exhibited the ferroelectric performance comparable to those with SrRuO3 under layer could be achieved in the samples with Pt thickness in the range of 10 to 20 nm. Different from the polycrystalline BFO/SrRuO3 films, large grain size for 50-nm-thick Pt underlayer causes degeneration of both the ferroelectric properties and the (001)-texture due to the formation of the secondary B2O3 phase. On the other hand, reducing Pt thickness to 5 nm resulted in the induction of the pinholes and thus the increase of the leakage current density. The presented results reveal that a smooth interface between the Pt electrode and BFO layer is essential to achieve good ferroelectric properties.

Multiferroic properties of (Bi, Ca)FeO 3 films on glass substrates

“…Different from ceramics, ferroelectric properties are sensitive to the surface or interface structure of electrode [25][26][27][28][29][30][31][32]. In our previous studies, the refined metal bottom electrodes on glass substrates is helpful in lowering the formation temperature of perovskite phase of BFO and attaining flat dense microstructure and interface, which leads to good ferroelectric properties [25][26][27][28][29][30][31][32]. In this study, we report on Bi 1−x Ca x FeO 3 films with x = 0.05, 0.1, and 0.15 grown on refined metallic Pt(1 1 1) electrode layer buffered glass substrate by pulsed laser deposition (PLD) at reduced temperature of 450 • C. Structural, ferroelectric, and magnetic characterizations of BCFO films are presented.…”

Effect of Ba substitution on the multiferroic properties of BiFeO3 films on glass substrates

“…In our previous studies, various optimized metal bottom electrodes on glass substrates is established, which lowers the formation temperature of the perovskite BFO phase, attaining flat dense microstructure and interface, and thus good ferroelectric properties. [20][21][22][23] In this study, BBFO films with x ¼ 0.05, 0.1, and 0.15 are grown on refined metallic Pt(111) electrode layer buffered glass substrate by pulsed laser deposition (PLD) at reduced temperature of 450 C. Structural, ferroelectric, and magnetic characterizations of BBFO films are reported.…”