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Microstructure and ferroic properties of epitaxial composite bilayers
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Image of FIG. 1.
FIG. 1.

Schematic representation of the epitaxial heterostructures: (a) BFO and (b) BLT single layers epitaxially grown on (111)-oriented substrates coated with (40 nm) bottom electrode; (c) BFO–FO/BLT and (d) BLT/BFO-FO bilayers in which the BFO-FO layer is the self assembled nanocomposite composed of and phases.

Image of FIG. 2.
FIG. 2.

XRD patterns of BFO and BLT single layers and BFO–FO/BLT and BLT/BFO–FO bilayers. ●, ▼, ◼, and ▲ stand for , , , and reflections, respectively.

Image of FIG. 3.
FIG. 3.

XRD pole figures (center: ; rim: ) of a BFO-FO/BLT bilayer recorded at different angles of (a) 31.8°, (b) 30.1°, and (c) 43.3° corresponding, respectively, to the BFO {110}, BLT {117}, and FO {400} reflections.

Image of FIG. 4.
FIG. 4.

BF-TEM image and selected area diffraction patterns (SADP) of a BFO–FO/BLT bilayer. (a) Cross-section image showing the area selected (dashed circle) for the analysis of the phases of the BFO–FO layer-orientations shown are STO substrate ones. SAD patterns taken along the STO [121] direction of (b) the STO substrate and (c) of the BFO–FO layer. (d) Schematic of the BFO–FO phase diffraction pattern corresponding to (c).

Image of FIG. 5.
FIG. 5.

Low-angle ADF-TEM image (a), TEM-EDX element mappings for Fe (c), and Bi (d), of a BLT/BFO–FO bilayer cross-section. (b) Schematic representation of the phase’s localization in the BLT/BFO–FO bilayer cross-section.

Image of FIG. 6.
FIG. 6.

Room temperature ferroelectric hysteresis loops recorded at 2 kHz [(a), (c), (e), and (g)] together with electrical-field dependences of remanent polarization and coercive field [(b), (d), (f), and (h)] for BFO [(a),(b)] and BLT [(c) and (d)] single layers and for BFO–FO/BLT [(e) and (f)], and BLT/BFO-FO [(g) and (h)] bilayers.

Image of FIG. 7.
FIG. 7.

Current vs electric field loops for BFO (a) and BLT (b) single layers and for BFO–FO/BLT (c) and BLT/BFO–FO (d) bilayers.

Image of FIG. 8.
FIG. 8.

Electric field dependences of [(a) and (b)] the dielectric constant (recorded at 2 kHz) and (c) the leakage dc current density of BFO and BLT single layers [(a) and (c)] and BFO-FO/BLT and BLT/BFO-FO bilayers [(b) and (c).

Image of FIG. 9.
FIG. 9.

Out-of-plane converse piezoelectric coefficient vs applied electric field hysteresis loops of BFO (a) and BLT (b) single layers and BFO–FO/BLT (c) and BLT/BFO–FO (d) bilayers.

Image of FIG. 10.
FIG. 10.

hysteresis loops of BFO–FO/BLT (a) and BLT/BFO–FO (b) bilayers, measured at room temperature with in-plane (circles) and out-of plane (filled squares) applied magnetic fields. The hysteresis loops correspond to magnetic responses of the BFO–FO composite layers.


Generic image for table
Table I.

Interplanar distance between BFO (111) planes , BFO and FO crystallites size (resp. , ), area of the FO 111 reflection normalized with respect to the area of the STO 111 reflection ( gives an estimation of the relative amount of FO), and interplanar distance between BLT (104) planes , for BFO single layers, BFO–FO/BLT and BLT/BFO–FO bilayers, estimated from Fig. 2. All layers and multilayers are deposited on SRO-coated STO(111).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microstructure and ferroic properties of epitaxial [γ-Fe2O3–BiFeO3]−Bi3.25La0.75Ti3O12 composite bilayers