Two-dimensional growth of SrTiO3 thin films on (001) MgO substrates using pulsed laser deposition and reflection high energy electron diffraction

Two-dimensional epitaxial growth of SrTiO3 is achieved on MgO, a substrate presenting a large lattice mismatch of 7.9%. In situ reflection high energy electron diffraction (RHEED) is used to monitor and control the growth. An interval deposition technique is implemented to force the two-dimensional growth. It is necessary to deposit a single atomic layer of TiO2 before SrTiO3 to prevent the formation of high energy SrO/MgO interfaces and so allow the film to completely wet the substrate surface. Defect formation is inhibited. The resulting film exhibits a similar surface to the substrate and shows a streaky RHEED pattern.

[1]  I. Jones,et al.  Growth and Microstructural Studies of Strontium Titanate Films Grown by Standard and Interval Pulsed Laser Deposition , 2008 .

[2]  P. Casek,et al.  SrTiO3(001) thin films on MgO(001): a theoretical study , 2004 .

[3]  Felix A. Miranda,et al.  Epitaxial growth of dielectric Ba0.6Sr0.4TiO3 thin film on MgO for room temperature microwave phase shifters , 2001 .

[4]  H. Christen,et al.  Recent advances in pulsed-laser deposition of complex oxides , 2008, Journal of physics. Condensed matter : an Institute of Physics journal.

[5]  A. Tagantsev,et al.  Ferroelectric Materials for Microwave Tunable Applications , 2003 .

[6]  R. Ramesh,et al.  Dielectric properties in heteroepitaxial Ba0.6Sr0.4TiO3 thin films: Effect of internal stresses and dislocation-type defects , 2000 .

[7]  H. Koinuma,et al.  Step-flow growth of SrTiO3 thin films with a dielectric constant exceeding 104 , 1999 .

[8]  E. Specht,et al.  The MBE growth and optical quality of BaTiO{sub 3} and SrTiO{sub 3} thin films on MgO , 1994 .

[9]  V. Nagarajan,et al.  Can interface dislocations degrade ferroelectric properties , 2004 .

[10]  Michael J. Lancaster,et al.  Thin-film ferroelectric microwave devices , 1998 .

[11]  H. Koinuma,et al.  Growth mode mapping of SrTiO3 epitaxy , 2000 .

[12]  H. Rogalla,et al.  In-situ monitoring during pulsed laser deposition of complex oxides using reflection high energy electron diffraction under high oxygen pressure , 1997 .

[13]  P. Cohen,et al.  Reflection high-energy electron diffraction , 2004 .

[14]  Walker,et al.  Interface stability and the growth of optical quality perovskites on MgO. , 1994, Physical review letters.

[15]  H. Rogalla,et al.  Imposed layer-by-layer growth by pulsed laser interval deposition , 1999 .

[16]  A. Rijnders.  The initial growth of complex oxides : study and manipulation , 2001 .