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Ferroelectric properties of PZT/BFO multilayer thin films prepared using the sol-gel method.

Jo SH, Lee SG, Lee YH - Nanoscale Res Lett (2012)

Bottom Line: In this study, Pb(Zr0.52Ti0.48)O3/BiFeO3 [PZT/BFO] multilayer thin films were fabricated using the spin-coating method on a Pt(200 nm)/Ti(10 nm)/SiO2(100 nm)/p-Si(100) substrate alternately using BFO and PZT metal alkoxide solutions.As the number of coatings increased, the remanent polarization and coercive field increased.The values for the BFO-6 multilayer thin film were 41.3 C/cm2 and 15.1 MV/cm, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Ceramic Engineering, Engineering Research Institute, Gyeongsang National University, Jinju-Si, 660-701, South Korea. lsgap@gnu.ac.kr.

ABSTRACT
In this study, Pb(Zr0.52Ti0.48)O3/BiFeO3 [PZT/BFO] multilayer thin films were fabricated using the spin-coating method on a Pt(200 nm)/Ti(10 nm)/SiO2(100 nm)/p-Si(100) substrate alternately using BFO and PZT metal alkoxide solutions. The coating-and-heating procedure was repeated several times to form the multilayer thin films. All PZT/BFO multilayer thin films show a void-free, uniform grain structure without the presence of rosette structures. The relative dielectric constant and dielectric loss of the six-coated PZT/BFO [PZT/BFO-6] thin film were approximately 405 and 0.03%, respectively. As the number of coatings increased, the remanent polarization and coercive field increased. The values for the BFO-6 multilayer thin film were 41.3 C/cm2 and 15.1 MV/cm, respectively. The leakage current density of the BFO-6 multilayer thin film at 5 V was 2.52 × 10-7 A/cm2.

No MeSH data available.


Related in: MedlinePlus

P-E hysteresis loops of PZT/BFO multilayer thin films. (a) PZT/BFO/PZT/BFO, (b) PZT/BFO/PZT/BFO/PZT, and (c) PZT/BFO/PZT/BFO/PZT/BFO films.
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Figure 4: P-E hysteresis loops of PZT/BFO multilayer thin films. (a) PZT/BFO/PZT/BFO, (b) PZT/BFO/PZT/BFO/PZT, and (c) PZT/BFO/PZT/BFO/PZT/BFO films.

Mentions: Figure 4 shows the hysteresis loops of PZT/BFO multilayer thin films. Well-saturated hysteresis loops could be obtained for all films. The remanent polarization and coercive field increased with an increase in the number of coatings. These properties can be understood in terms of the effect of grain size and the large ionic displacement in the distorted perovskite structure as discussed in Figure 3. Generally, by increasing film thickness, the stress induced from the substrate is reduced. However, in this study, despite an increase in film thickness, the coercive field increased with an increase in the number of coatings. This property can be understood in terms of the effect of interface layers formed between the PZT and BFO layers. The space-charge layer, which forms at the interfacial layer due to the diffusion of Pb, Ti, Zr, Bi, and Fe at the interfaces of the PZT and BFO films, acts to suppress the polarization rotation. The PZT/BFO-6 multilayer film shows a remanent polarization of 41.3 μC/cm2 and a coercive field of 15.1 MV/m.


Ferroelectric properties of PZT/BFO multilayer thin films prepared using the sol-gel method.

Jo SH, Lee SG, Lee YH - Nanoscale Res Lett (2012)

P-E hysteresis loops of PZT/BFO multilayer thin films. (a) PZT/BFO/PZT/BFO, (b) PZT/BFO/PZT/BFO/PZT, and (c) PZT/BFO/PZT/BFO/PZT/BFO films.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3275469&req=5

Figure 4: P-E hysteresis loops of PZT/BFO multilayer thin films. (a) PZT/BFO/PZT/BFO, (b) PZT/BFO/PZT/BFO/PZT, and (c) PZT/BFO/PZT/BFO/PZT/BFO films.
Mentions: Figure 4 shows the hysteresis loops of PZT/BFO multilayer thin films. Well-saturated hysteresis loops could be obtained for all films. The remanent polarization and coercive field increased with an increase in the number of coatings. These properties can be understood in terms of the effect of grain size and the large ionic displacement in the distorted perovskite structure as discussed in Figure 3. Generally, by increasing film thickness, the stress induced from the substrate is reduced. However, in this study, despite an increase in film thickness, the coercive field increased with an increase in the number of coatings. This property can be understood in terms of the effect of interface layers formed between the PZT and BFO layers. The space-charge layer, which forms at the interfacial layer due to the diffusion of Pb, Ti, Zr, Bi, and Fe at the interfaces of the PZT and BFO films, acts to suppress the polarization rotation. The PZT/BFO-6 multilayer film shows a remanent polarization of 41.3 μC/cm2 and a coercive field of 15.1 MV/m.

Bottom Line: In this study, Pb(Zr0.52Ti0.48)O3/BiFeO3 [PZT/BFO] multilayer thin films were fabricated using the spin-coating method on a Pt(200 nm)/Ti(10 nm)/SiO2(100 nm)/p-Si(100) substrate alternately using BFO and PZT metal alkoxide solutions.As the number of coatings increased, the remanent polarization and coercive field increased.The values for the BFO-6 multilayer thin film were 41.3 C/cm2 and 15.1 MV/cm, respectively.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Ceramic Engineering, Engineering Research Institute, Gyeongsang National University, Jinju-Si, 660-701, South Korea. lsgap@gnu.ac.kr.

ABSTRACT
In this study, Pb(Zr0.52Ti0.48)O3/BiFeO3 [PZT/BFO] multilayer thin films were fabricated using the spin-coating method on a Pt(200 nm)/Ti(10 nm)/SiO2(100 nm)/p-Si(100) substrate alternately using BFO and PZT metal alkoxide solutions. The coating-and-heating procedure was repeated several times to form the multilayer thin films. All PZT/BFO multilayer thin films show a void-free, uniform grain structure without the presence of rosette structures. The relative dielectric constant and dielectric loss of the six-coated PZT/BFO [PZT/BFO-6] thin film were approximately 405 and 0.03%, respectively. As the number of coatings increased, the remanent polarization and coercive field increased. The values for the BFO-6 multilayer thin film were 41.3 C/cm2 and 15.1 MV/cm, respectively. The leakage current density of the BFO-6 multilayer thin film at 5 V was 2.52 × 10-7 A/cm2.

No MeSH data available.


Related in: MedlinePlus