On the Stabilization of Ion Sputtered Surfaces

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On the Stabilization of Ion Sputtered Surfaces

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Title: On the Stabilization of Ion Sputtered Surfaces
Author: Aziz, Michael; Brenner, Michael; Davidovitch, Benny

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Citation: Davidovitch, Benny, Michael J. Aziz, and Michael P. Brenner. 2007. On the stabilization of ion sputtered surfaces. Physical Review B 76(20): 205420.
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Abstract: The classical theory of ion beam sputtering predicts the instability of a flat surface to uniform ion irradiation at any incidence angle. We relax the assumption of the classical theory that the average surface erosion rate is determined by a Gaussian response function representing the effect of the collision cascade, and consider the surface dynamics for other physically motivated response functions. We show that although instability of flat surfaces at any beam angle results from all Gaussian and a wide class of non-Gaussian erosive response functions, there exist classes of modifications to the response that can have a dramatic effect. In contrast to the classical theory, these types of response render the flat surface linearly stable, while imperceptibly modifying the predicted sputter yield vs incidence angle. We discuss the possibility that such corrections underlie recent reports of a “window of stability” of ion-bombarded surfaces at a range of beam angles for certain ion and surface types, and describe some characteristic aspects of pattern evolution near the transition from unstable to stable dynamics. We point out that careful analysis of the transition regime may provide valuable tests for the consistency of any theory of pattern formation on ion sputtered surfaces.
Published Version: http://dx.doi.org/10.1103/PhysRevB.76.205420
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:2795223
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