Ion-Beam-Induced Surface Instability of Glassy Fe40Ni40B20

Abstract
Depending on the angle of incidence θ, implantation of fast heavy ions into amorphous Fe40Ni40 B20 leads to drastic surface smoothing ( θ15°) or surface roughening ( θ20°) when fluences between 1014 and 1015 ions/cm2 are applied. Both effects proceed without detectable mass loss. Prior to roughening, rather regular undulations appear with wavelengths between 20 and 30 μm. It is argued that the observed surface instability is a consequence of an ion-induced shear flow which presumably occurs in all amorphous materials.

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