Electromigration-driven Evolution of the Surface Morphology and Composition for a Bi-Component Solid Film


A two PDEs-based model is developed for studies of a morphological and compositional evolution of a thermodynamically stable alloy surface in a strong electric field, assuming different and anisotropic diffusional mobilities of the two atomic components. The linear stability analysis of a planar surface and the computations of morphology coarsening are performed. It is shown that the conditions for instability and the characteristic wavelength and growth rate differ from their counterparts in a single-component film. Computational parametric analyses reveal the sensitivity of the scaling exponents to the electric field strength and to the magnitude of anisotropies difference.


Mechanics of Materials | Non-linear Dynamics | Other Materials Science and Engineering | Partial Differential Equations | Statistical, Nonlinear, and Soft Matter Physics