“…Further details can be found in Refs. [7,11,27]. The films were subsequently annealed in Ar-H 2 gas environment at 750 C for 1 h. The annealed films (hereafter labeled as unirradiated) were subjected to 100 MeV Au þ7 SHI irradiation (with fluences 5.0 Â 10 13 ions/cm 2 , 7.5 Â 10 13 ions/cm 2 and 1.0 Â 10 14 ions/ cm 2 ) perpendicular to film-surface (to be referred as 5e13, 7.5e13 and 1e14 respectively from now on).…”