Producing nanodot arrays with improved hexagonal order by patterning surfaces before ion sputtering

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Daniel A PearsonPatrick D Shipman

Abstract

When the surface of a nominally flat binary material is bombarded with a broad, normally incident ion beam, disordered hexagonal arrays of nanodots can form. Shipman and Bradley have derived equations of motion that govern the coupled dynamics of the height and composition of such a surface [Shipman and Bradley, Phys. Rev. B 84, 085420 (2011)]. We investigate the influence of initial conditions on the hexagonal order yielded by integration of those equations of motion. The initial conditions studied are hexagonal and sinusoidal templates, straight scratches, and nominally flat surfaces. Our simulations indicate that both kinds of templates lead to marked improvements in the hexagonal order if the initial wavelength is approximately equal to or double the linearly selected wavelength. Scratches enhance the hexagonal order in their vicinity if their width is close to or less than the linearly selected wavelength. Our results suggest that prepatterning a binary material can dramatically increase the hexagonal order achieved at large ion fluences.

References

Dec 15, 1996·Physical Review. B, Condensed Matter·G Carter, V Vishnyakov
Sep 6, 2005·Science·Michael MoselerJohn Robertson
Aug 7, 2007·Physical Review Letters·V B ShenoyE Chason
Jan 26, 2010·Nanotechnology·Sven MackoThomas Michely
Jan 15, 2011·Physical Review Letters·R Mark Bradley, Patrick D Shipman
Mar 17, 2011·Physical Review Letters·Charbel S MadiMichael J Aziz
Jun 3, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M JoeJ-S Kim

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