ملخص: The thermal spike model was applied to calculate track radii versus electronic stopping power for different beam energies using only one fitting parameter, [lambda] the mean diffusion length of the energy deposited on the electrons by the slowing down of a swift heavy ion in vitreous silica a-SiO2. A [lambda] value of 2.5+/-0.2 nm is extracted by fitting all the different results of damage creation taking into account a velocity effect. Using the same value of [lambda] the energy necessary to vaporize the vitreous silica is reached for a value of electronic stopping power dE/dx, which corresponds to the appearance of a huge sputtering of silicon in SiO2. So in the thermal spike model one can explain two phenomena with the same value of the free parameter [lambda]. The present paper aims at extending this model to the yttrium iron garnet Y3Fe5O12, abbreviated as YIG. By fitting the latent track radii one can extract the unique following values: [lambda]=5.0+/-0.3 nm and a latent heat of fusion LH=300+/-100 J g-1. Then the energy value Lv of 2.2+/-0.4 eV/atom necessary to sputter this material is extracted. The evolution of sputtering yield versus the electronic stopping power is in good agreement with the experimental results. %

لغة: إنجليزية