4 research outputs found
Morphological regions and oblique incidence dot formation in a model of surface sputtering
We study solid surface morphology created by off-normal ion-beam sputtering
with an atomistic, solid-on-solid model of sputter erosion. With respect to an
earlier version of the model, we extend this model with the inclusion of
lateral erosion. Using the 2-dimensional structure factor, we found an upper
bound , in the lateral straggle , for clear ripple formation.
Above this upper bound, for longitudinal straggle , we found
the possibility of dot formation (without sample rotation). Moreover, a
temporal crossover from a hole topography to ripple topography with the same
value of collision cascade parameters was found. Finally, a scaling analysis of
the roughness, using the consecutive gradient approach, yields the growth
exponents and 0.67 for two different topographic regimes.Comment: 8 pages, 14 figure