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The Role of Long‐Wave Bending Vibrations in the Destruction of Ultrathin Al Films
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-10-29 , DOI: 10.1002/pssb.202000484 Evgenii Salamatov 1 , Elena Dolgusheva 1
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-10-29 , DOI: 10.1002/pssb.202000484 Evgenii Salamatov 1 , Elena Dolgusheva 1
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The molecular dynamics method is used to study the process of development of dynamic instability of a thin film, leading to its destruction. The calculations are performed for a thin aluminum film using the interatomic interaction potential tested by comparing the numerical results with the analytical ones from the elasticity theory. An original approach which allows one to calculate the dispersion law of long‐wave phonons in ultrathin films is developed. The temperatures (<600 K) at which the system remains stable for 0.6 ns are found. This makes it possible to analyze the low‐frequency part of the spectrum down to the minimum frequency νmin = 0.0166 THz, and to determine the vibration frequency of the longest bending wave ν0 = 0.033 THz which decreases with increasing temperature, and therefore, its period grows. Once the vibration period becomes comparable with the time of simulation, there occurs a continuous increase in the amplitude of this mode which will be referred to as “retarded mode.” It is shown that the film destruction begins with the attainment of a certain critical value of the bending wave amplitude.
中文翻译：
长波弯曲振动在超薄铝膜破坏中的作用
分子动力学方法用于研究薄膜动态不稳定性的发展过程，从而导致薄膜的破坏。通过将数值结果与弹性理论的解析结果进行比较，使用测试的原子间相互作用势来对铝薄膜进行计算。开发了一种原始方法，该方法可以计算长波声子在超薄膜中的色散规律。发现系统在0.6 ns内保持稳定的温度（<600 K）。这使得有可能以频谱的低频部分分析下降到最小频率ν分钟 = 0.0166太赫兹，并确定最长的弯曲波的振动频率ν 0 = 0.033 THz，随温度升高而降低，因此其周期增加。一旦振动周期变得与模拟时间相当，该模式的振幅就会连续增加，这将被称为“延迟模式”。结果表明，膜破坏始于达到弯曲波振幅的某个临界值。
更新日期：2020-10-29
中文翻译：
长波弯曲振动在超薄铝膜破坏中的作用
分子动力学方法用于研究薄膜动态不稳定性的发展过程，从而导致薄膜的破坏。通过将数值结果与弹性理论的解析结果进行比较，使用测试的原子间相互作用势来对铝薄膜进行计算。开发了一种原始方法，该方法可以计算长波声子在超薄膜中的色散规律。发现系统在0.6 ns内保持稳定的温度（<600 K）。这使得有可能以频谱的低频部分分析下降到最小频率ν分钟 = 0.0166太赫兹，并确定最长的弯曲波的振动频率ν 0 = 0.033 THz，随温度升高而降低，因此其周期增加。一旦振动周期变得与模拟时间相当，该模式的振幅就会连续增加，这将被称为“延迟模式”。结果表明，膜破坏始于达到弯曲波振幅的某个临界值。
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