Data retention characteristics of Bi3.25La0.75Ti3O12 thin films on conductive SrRuO3 electrodes

Ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films were deposited on SrRuO3 (SRO) and Pt electrodes by pulsed laser deposition. The data retention characteristics of the BLT films on different electrode materials were characterized. The experimental results are well fitted by a stretched exponential decay model, indicating that BLT films on both Pt and SRO exhibit the similar decay mechanisms. However, the decay behavior is quite different due to the use of different bottom electrodes. The superior data retention performance of BLT film on conductive SRO electrode is believed to be from the reduction of domain polarization backswitching originated from the oxygen vacancies in the depletion region of BLT films.

[1]  B. Kang,et al.  Anisotropic dielectric properties in epitaxial Bi3.25La0.75Ti3O12 thin films along different crystal directions , 2004 .

[2]  Q. Jia,et al.  Hydrogen-induced degradation in epitaxial and polycrystalline (Ba,Sr)TiO3 thin films , 2004 .

[3]  B. Kang,et al.  Polarization retention in Pb(Zr0.4Ti0.6)O3 capacitors with IrO2 top electrodes , 2004 .

[4]  S. Joo,et al.  Role of grain boundaries on hydrogen-induced degradation in lead zirconate titanate thin films , 2002 .

[5]  B. Kang,et al.  Retention Characteristics of Bi3.25La0.75Ti3O12 Thin Films , 2002 .

[6]  Y. Kubo,et al.  Crystal and electronic structures of Bi4−xLaxTi3O12 ferroelectric materials , 2001 .

[7]  T. Mikawa,et al.  A highly reliable ferroelectric memory technology with SrBi/sub 2/Ta/sub 2/O/sub 9/-based material and metal covering cell structure , 2001 .

[8]  M. Tanaka,et al.  Polarization retention in SrBi2Ta2O9 thin films investigated at nanoscale , 2001 .

[9]  B. S. Kang,et al.  Lanthanum-substituted bismuth titanate for use in non-volatile memories , 1999, Nature.

[10]  R. Ramesh,et al.  Oxide electrodes as barriers to hydrogen damage of Pb(Zr,Ti)O3-based ferroelectric capacitors , 1999 .

[11]  Orlando Auciello,et al.  Nanoscale imaging of domain dynamics and retention in ferroelectric thin films , 1997 .

[12]  Ramamoorthy Ramesh,et al.  Thin Film Ferroelectric Materials and Devices , 1997 .

[13]  Quanxi Jia,et al.  Structural and electrical properties of Ba0.5Sr0.5TiO3 thin films with conductive SrRuO3 bottom electrodes , 1995 .

[14]  M. C. Scott,et al.  Fatigue-free ferroelectric capacitors with platinum electrodes , 1995, Nature.

[15]  Hidemi Takasu,et al.  Preparation of Pb(Zr,Ti)O3 thin films on electrodes including IrO2 , 1994 .