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Microstructure and ferroic properties of epitaxial composite bilayers
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10.1063/1.3514591
/content/aip/journal/jap/108/11/10.1063/1.3514591
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3514591

Figures

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.

Tables

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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/content/aip/journal/jap/108/11/10.1063/1.3514591
2010-12-10
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microstructure and ferroic properties of epitaxial [γ-Fe2O3–BiFeO3]−Bi3.25La0.75Ti3O12 composite bilayers
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/11/10.1063/1.3514591
10.1063/1.3514591
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