Non-linear ripple dynamics on amorphous surfaces patterned by ion-beam sputtering
arXiv:cond-mat/0506469 · doi:10.1103/PhysRevLett.96.086101
Abstract
Erosion by ion-beam sputtering (IBS) of amorphous targets at off-normal incidence frequently produces a (nanometric) rippled surface pattern, strongly resembling macroscopic ripples on aeolian sand dunes. Suitable generalization of continuum descriptions of the latter allows us to describe theoretically for the first time the main nonlinear features of ripple dynamics by IBS, namely, wavelength coarsening and non-uniform propagation velocity, that agree with similar results in experiments and discrete models. These properties are seen to be the anisotropic counterparts of in-plane ordering and (interrupted) pattern coarsening in IBS experiments on rotating substrates and at normal incidence.
5 pages, 3 figures
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- Physical processes causing the formation of penitentes
- Short-range stationary patterns and long-range disorder in an evolution equation for one-dimensional interfaces
- Ion beam generated surface ripples: new insight in the underlying mechanism
- Generic equations for pattern formation in evolving interfaces
- A Monte Carlo study of surface sputtering by dual and rotated ion beams
- Symmetry of surface nanopatterns induced by ion-beam sputtering: the role of anisotropic surface diffusion