2019
DOI: 10.1088/1361-6463/ab1f58
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Evolution of quasiperiodic microstructure of Ge–Sb–Te-based films irradiated by multi-pulsed picosecond laser

Abstract: 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… Show more

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Cited by 2 publications
(2 citation statements)
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“…As compared to those observations in figure 1, the size of the crystallization zone increases quickly with the increase of the input energy of the second pulse, and the ring-pattern is formed some abnormal 'grain band' appearing clearly in figures 3(a)-(c) are because of the grain growth-up after the second laser irradiation. The microstructure characteristics of 'ring pattern' were reported by author in detail in [24]. Also, it is noted that when the input energy of second pulse is 28.6 mJ, ablation at the center region (see figure 1(f)) is not observed.…”
Section: Effect Of the Overlapping Ratio Between Two Pulsesmentioning
confidence: 70%
“…As compared to those observations in figure 1, the size of the crystallization zone increases quickly with the increase of the input energy of the second pulse, and the ring-pattern is formed some abnormal 'grain band' appearing clearly in figures 3(a)-(c) are because of the grain growth-up after the second laser irradiation. The microstructure characteristics of 'ring pattern' were reported by author in detail in [24]. Also, it is noted that when the input energy of second pulse is 28.6 mJ, ablation at the center region (see figure 1(f)) is not observed.…”
Section: Effect Of the Overlapping Ratio Between Two Pulsesmentioning
confidence: 70%
“…The microstructures [ 15 , 16 , 17 ], crystallization structure [ 18 ], reflectivity and gray-scale [ 19 ], etc., of the amorphous, crystalline, and intermediate phase states GST were investigated using the Raman spectrum [ 20 ], scanning electron microscopy (SEM) [ 16 ] and transmission electron microscopy (TEM) [ 17 , 21 ] and so on, which were characterized ex-situ. The results indicated the characteristics after irradiation by a femtosecond laser, and the phase transition mechanism of GST induced by a femtosecond laser was inferred.…”
Section: Introductionmentioning
confidence: 99%