An analytical model of surface topography evolution during ion sputtering is applied to investigate the eroded profile in a steady state during scanning focused-ion-beam (FIB) sputtering. Some calculations are carried out to demonstrate the eroded profile under the known parameters, i.e. sputtering yield as a function of ion incident angle, the FIB profile, and the FIB scan speed. The present approach is useful to obtain roughly the characteristics of FIB sputtering such as the erosion rate and the length and gradient angle of the step-like slope formed on the eroded surface.
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Ishitani et al. (1989) studied this question.
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