Filters

2011 - 20142

More filters

20202
Reset filters

Settings

Author: Frost, F. × Subject: Ion beams ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Phenomenology of iron-assisted ion beam pattern formation on Si(001)
    (Bristol : IOP, 2011) MacKo, S.; Frost, F.; Engler, M.; Hirsch, D.; Höche, T.; Grenzer, J.; Michely, T.
    Pattern formation on Si(001) through 2 keV Kr+ ion beam erosion of Si(001) at an incident angle of # = 30° and in the presence of sputter codeposition or co-evaporation of Fe is investigated by using in situ scanning tunneling microscopy, ex situ atomic force microscopy and electron microscopy. The phenomenology of pattern formation is presented, and experiments are conducted to rule out or determine the processes of relevance in ion beam pattern formation on Si(001) with impurities. Special attention is given to the determination of morphological phase boundaries and their origin. Height fluctuations, local flux variations, induced chemical inhomogeneities, silicide formation and ensuing composition-dependent sputtering are found to be of relevance for pattern formation.
  • Thumbnail Image
    Item
    Ripple coarsening on ion beam-eroded surfaces
    (New York, NY [u.a.] : Springer, 2014) Teichmann, M.; Lorbeer, J.; Frost, F.; Rauschenbach, B.
    Abstract: The temporal evolution of ripple pattern on Ge, Si, Al2O3, and SiO2 by low-energy ion beam erosion with Xe + ions is studied. The experiments focus on the ripple dynamics in a fluence range from 1.1 × 1017 cm-2 to 1.3 × 1019 cm-2 at ion incidence angles of 65° and 75° and ion energies of 600 and 1,200 eV. At low fluences a short-wavelength ripple structure emerges on the surface that is superimposed and later on dominated by long wavelength structures for increasing fluences. The coarsening of short wavelength ripples depends on the material system and angle of incidence. These observations are associated with the influence of reflected primary ions and gradient-dependent sputtering. The investigations reveal that coarsening of the pattern is a universal behavior for all investigated materials, just at the earliest accessible stage of surface evolution.