Well-Ordered Self-Assembly Growth of Strain-Modulated SrTiO₃ Thin Films: Templates for Complex Oxide Quantum Wires

Abstract:

Well-ordered self-assembled SrTiO3 thin film, as a template for complex oxide quantum wires, was fabricated on LaAlO3 (100) single crystal substrates with laser molecular beam epitaxy. The self-assembled growth was in-situ monitored by reflective high energy electron diffraction. The morphology evolutions of the films as a function of thickness were studied by ex-situ atomic force microscopy. As the thickness of the films increased from 3.875nm to 46.5nm gradually, the compressive stress-induced SrTiO3 films exhibited a periodic well-ordered ripple structure, which formed a unique nanoassembled template for the fabrication of quantum wires. Small angle X-ray scattering technique was employed to investigate the structure. Symmetric satellite peaks were discovered, indicating the well-ordered superstructure. In contrast, the similar superstructure was not observed during the growth of the tensile stress-induced LaAlO3 films on SrTiO3 substrates. The Compressive stress was considered as the main reason of the self-assembled growth, and systematical elucidation about strain mechanism was discussed. These results might provide an efficient method for the controllable formation of well-aligned template of quantum wire for complex oxide with desirable structure via proper modulation of strains.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 4255-4260
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.4255
• Online since: January 2005
• Authors: Yan Rong Li, Jin Long Li, Ying Zhang, Xin Wu Deng, Fan Yang, Wei Dong Fei
• Keywords: Complex Oxide, Quantum Wire, Self-Assembly Growth, Template

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