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Layer-by-layer growth of ultrathin LaCoO3 film on SrTiO3(001) by pulse laser deposition
Y. J. Shi,D. Wu *
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
*Correspondence author
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Funding: NSF of China （No.10804046, 10974084) and Jiangsu Province）
Opened online:16 January 2012
Accepted by: none
Citation: Y. J. Shi,D. Wu.Layer-by-layer growth of ultrathin LaCoO3 film on SrTiO3(001) by pulse laser deposition[OL]. [16 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4459903
 
 
We have studied the epitaxial growth of LaCoO3 films on SrTiO3(001) substrate by pulsed laser deposition (PLD) method. Reflection high-energy electron diffraction (RHEED) patterns and intensity oscillations indicate that the two-dimensional layer-by-layer growth for initial 2 unit cell (u.c.) thick film. The film growth transfers to three-dimensional island growth at a critical film thickness of 3 u.c. to relieve the strain, due to the large lattice mismatch of 2.63% between LaCoO3 film and SrTiO3 substrate. The morphology of films investigated by atomic force microscopy (AFM) confirms the film growth mode transition from layer-by-layer to island mode. The magnetic measurement shows that the corresponding ferromagnetic moment per Co ion of 2 u.c. tensile films is more than six times larger than that of 20 u.c. lattice-relaxed films
Keywords:LaCoO3; epitaxy; pulse laser deposition
 
 
 

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