Force Microscopy Study of SrTiO3(001) Surfaces with Single Atomic-Layer Steps
Force Microscopy Study of SrTiO3(001) Surfaces with Single Atomic-Layer Steps
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单原子层台阶 SrTiO3(001) 表面的力显微镜研究
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. Aono
中科院分区：
文献类型：
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作者：
K. Iwahori;ShunjiWatanabe Komeda;MakiKawai Saito;Y. Kuwahara;M. Aono
通过超声搅拌和随后的1000℃空气退火相结合，成功地获得了原子平坦的SrTiO3（001）表面。利用原子力显微镜拍摄的地形图像显示，表面由清晰的原子台阶和原子光滑的阶地组成。台阶高度为0.2 nm，相当于SrTiO3单晶胞高度的一半，即单原子层高度。阶地分为两种类型；宽阔和狭窄的梯田交替出现。同轴碰撞离子散射光谱分析表面组成表明，最上层表面被SrO和TiO2层覆盖，其中后者占主导地位。结果表明，窄台阶的最上端被SrO终止，宽台阶的最上端被TiO2终止。通过使用摩擦力显微镜技术，我们能够区分不同的表面末端，进一步检查了这一点。
An atomically flat SrTiO3(001) surface was successfully obtained by combining ultrasonic agitation and subsequent annealing at 1000°C in air. The topographic images taken using an atomic force microscope revealed that the surface was composed of clear atomic-steps and atomically smooth terraces. The steps were 0.2 nm in height corresponding to half of the unit cell height of SrTiO3, or the single atomic-layer height. The terraces were categorized into two types; wide and narrow terraces appear alternately. Surface composition analyzed by coaxial impact collision ion scattering spectroscopy indicated that the topmost surface was covered by domains of the SrO and TiO2 layers, where the latter domain was dominant. The result suggests that the topmost surface of the narrow terrace was terminated by SrO and the wide terrace by TiO2. This was further examined by the use of a friction force microscopy technique with which we were able to distinguish the different surface terminations.