SURFACE-STRESS EFFECTS ON ELASTIC PROPERTIES .1. THIN METAL-FILMS
SURFACE-STRESS EFFECTS ON ELASTIC PROPERTIES .1. THIN METAL-FILMS
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DOI：
10.1103/physrevb.49.10699
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发表时间：
1994-04-15
影响因子：
3.7
通讯作者：
SIERADZKI, K
中科院分区：
文献类型：
--
作者：
STREITZ, FH;CAMMARATA, RC;SIERADZKI, K
我们提出了一个详细的模型，描述了表面应力对金属薄膜的平衡间距和双轴模量的影响。该模型预测，非常薄的薄膜将平衡到一个间距在平面上大大小于散装间距的材料，这种双轴应变将消失的倒数的膜厚度。该模型预测增强的双轴模量的薄金属膜，也规模与膜厚度的倒数。应变的大小和由此产生的双轴模量的变化与表面应力的大小成比例。我们验证了表面应力模型的预测进行分子动力学计算机模拟的金属薄膜使用的嵌入原子方法潜在的分析形式。该模型被发现准确地预测薄金属膜的平衡性质。
We present a detailed model describing the effects of surface stress on the equilibrium spacing and biaxial modulus of thin metal films. The model predicts that very thin films will equilibrate to a spacing in the plane substantially smaller than the bulk spacing for the material, and that this biaxial strain will vanish as the reciprocal of the film thickness. The model predicts enhancements in the biaxial modulus of thin metal films which also scale with the reciprocal of the film thickness. The magnitude of both the strain and the resulting change in biaxial modulus are proportional to the magnitude of the surface stress. We verified the predictions of the surface-stress model by performing molecular-dynamics computer simulations of thin metal films using an analytic form of the embedded-atom-method potential. The model was found to predict accurately the equilibrium properties of thin metal films.