**Figure 9.**

*Nanopicks formed in the (a) interdendritic zone and in the (b) dendrites branches.*

irradiated surface will be stable and will tend to grow as a result of the sputtering yield variation promoted by the local incidence angle change.

**Figure 9(a) and (b)** shows MFA images of the dendritic (**Figure 9b**) and interdendritic (**Figure 9a**) regions of the irradiation-affected area, both figures show the formation of peaks, cones, and other types of geometries and all of them have peaks that tend to have a conical shape. Another important factor detected is that the sputtering originated by chemical composition is of lower intensity than the geometrical sputtering, induced by incidence angle local variations of the ion beam.
