Ultrafast heating and resolution of recorded crystalline marks in phase-change media
Ultrafast heating and resolution of recorded crystalline marks in phase-change media
复制标题
相变介质中记录的晶体标记的超快加热和分辨率
DOI：
10.1063/1.3028269
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发表时间：
2008
影响因子：
3.2
通讯作者：
C. Wright
中科院分区：
文献类型：
--
作者：
M. Aziz;M. Belmont;C. Wright
本文分析研究了当加热源具有Delta函数时间分布时，非晶态到晶态的热激活相变过程。这模拟了超快加热的情况，其中非晶相变介质中的晶化发生在冷却过程中。这项研究得到了闭合形式的表达式，它预测了相变介质在超快退火过程中成功结晶所需的峰值温度，从而预测了能量密度随介质的动力学和热参数的函数。还导出了闭合形式的表达式，当相变停止时，提供了对最终结晶标记宽度和尾长的估计。分析表明，需要降低结晶活化能和介质的热扩散率，以降低热源产生的初始峰温度，以避免熔化，提高结晶速度，以达到足够的结晶分馏水平。
This work presents an analytical study of the thermally activated amorphous-to-crystalline phase-change process when the heating source has a delta function temporal profile. This simulates the case of ultrafast heating where crystallization in the amorphous phase-change medium occurs during cooling. The study produced closed-form expressions that predict the necessary peak temperature, and hence energy density, in the phase-change medium for successful crystallization during ultrafast annealing as functions of the kinetic and thermal parameters of the medium. Closed-form expressions were also derived that provide estimates of the final crystalline mark widths and tail lengths when phase change has ceased. The analysis indicated the need to reduce the activation energy of crystallization and the thermal diffusivity of the medium to reduce the initial peak temperature, produced by the heating source, to avoid melting, to increase the crystallization rate, to achieve sufficient levels of crystalline fractio...