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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Evolution of quasiperiodic microstructure of Ge-Sb-Te-based films irradiated by multi-pulsed picosecond laser
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Evolution of quasiperiodic microstructure of Ge-Sb-Te-based films irradiated by multi-pulsed picosecond laser

机译：多脉冲微倍激光照射的Ge-Sb-TE基膜的QuaSipheri周期微观结构的演变

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摘要

In this paper, the crystal morphology and grain size evolution of Ge-Sb-Te (GST) irradiated by multi-pulsed picosecond (ps) laser were characterized by transmission electron microscopy and selected area electron diffraction. Morphologies induced by multi-pulsed laser were radially quasiperiodic structures, and the crystallization area induced by the first laser pulse acted as the periodic repeated unit. Single laser pulse irradiation produced three different conterminal annular crystallization zones, and their formation mechanisms were discussed. GST films accumulated thermal and structural change induced by per laser pulse, reducing crystallization threshold and extending crystallization fluence range. Sequentially, every subsequent laser pulse created a new crystallization area, and then accumulated to be a pulse number dependence radially quasiperiodic structure. Meanwhile, the laser pulse train dramatically refined grains. The grain boundaries are presented as an alternating-layered structure or atomic ordering domain. The present study revealed microstructure evolution of intermediate states for multi-level storage and realized multi-phase changes and is critical to enhance storage density.
机译：在本文中，通过透射电子显微镜和选择的区域电子衍射来表征由多脉冲皮秒（PS）激光照射的GE-SB-TE（GST）的晶体形态和晶粒尺寸演化。由多脉冲激光诱导的形态学是径向QuaSiodic结构的，并且由第一激光脉冲引起的结晶面积充当为周期性重复单元。单一激光脉冲照射产生了三种不同的锥形环形结晶区，并讨论了它们的形成机制。 GST膜通过激光脉冲诱导的热和结构变化，减少结晶阈值并延伸结晶流量范围。顺序地，每个后续的激光脉冲产生新的结晶区域，然后累积为径向QuaSiodic结构的脉冲数依赖性。同时，激光脉冲训练急剧精制谷物。将晶界呈递为交替层状结构或原子排序结构域。本研究揭示了多级储存的中间状态的微观结构演化，实现了多相变化，以提高储存密度至关重要。

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