Self-organized formation of step-terrace structure in SrRuO3 thin films grown on mixed-terminated SrTiO3 (100) substrates
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917523585236992 |
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| author | Arakawa, Ryotaro Komori, Sachio Tomita, Kotaro Komori, Shunsei Tanaka, Masaaki A. Taniyama, Tomoyasu |
| author_facet | Arakawa, Ryotaro Komori, Sachio Tomita, Kotaro Komori, Shunsei Tanaka, Masaaki A. Taniyama, Tomoyasu |
| contents | Surface morphology of the substrate and bottom layers plays a critical role in the epitaxial growth of oxide thin films. Here, we report on the self-organized formation of a step-terrace structure in SrRuO3 (SRO) thin films grown using pulsed laser deposition on mixed-terminated SrTiO3 (100) substrates without any prior surface treatment. Atomic force microscopy observations reveal that SRO films initially grow in a three-dimensional island mode and subsequently undergo a transition to a step-flow growth mode through island coalescence as the film thickness increases, resulting in a well-defined step-terrace morphology with a step height consistent with the SRO unit-cell parameter. The average terrace width of the self-organized structure can be systematically tuned by varying the substrate temperature and the target-substrate distance, which we attribute to changes in the critical island radius that governs the nucleation behavior. To demonstrate the utility of this self-organized morphology, we show that BiFeO3 thin films grown on SRO films with such a step-terrace structure exhibit improved surface flatness and crystalline quality compared to those grown directly on bare SrTiO3 substrates. These findings provide a clear understanding of the mechanism of thickness-driven growth-mode transitions in perovskite oxide thin films under various growth conditions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_23450 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Self-organized formation of step-terrace structure in SrRuO3 thin films grown on mixed-terminated SrTiO3 (100) substrates Arakawa, Ryotaro Komori, Sachio Tomita, Kotaro Komori, Shunsei Tanaka, Masaaki A. Taniyama, Tomoyasu Materials Science Mesoscale and Nanoscale Physics Surface morphology of the substrate and bottom layers plays a critical role in the epitaxial growth of oxide thin films. Here, we report on the self-organized formation of a step-terrace structure in SrRuO3 (SRO) thin films grown using pulsed laser deposition on mixed-terminated SrTiO3 (100) substrates without any prior surface treatment. Atomic force microscopy observations reveal that SRO films initially grow in a three-dimensional island mode and subsequently undergo a transition to a step-flow growth mode through island coalescence as the film thickness increases, resulting in a well-defined step-terrace morphology with a step height consistent with the SRO unit-cell parameter. The average terrace width of the self-organized structure can be systematically tuned by varying the substrate temperature and the target-substrate distance, which we attribute to changes in the critical island radius that governs the nucleation behavior. To demonstrate the utility of this self-organized morphology, we show that BiFeO3 thin films grown on SRO films with such a step-terrace structure exhibit improved surface flatness and crystalline quality compared to those grown directly on bare SrTiO3 substrates. These findings provide a clear understanding of the mechanism of thickness-driven growth-mode transitions in perovskite oxide thin films under various growth conditions. |
| title | Self-organized formation of step-terrace structure in SrRuO3 thin films grown on mixed-terminated SrTiO3 (100) substrates |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.23450 |