Nano-hillock formation in diamond-like carbon induced by swift heavy projectiles in the electronic stopping regime: Experiments and atomistic simulations

作者：Schwen D^*; Bringa E; Krauser J; Weidinger A; Trautmann C; Hofsaess H

来源：Applied Physics Letters, 2012, 101(11): 113115.

DOI：10.1063/1.4752455

The formation of surface hillocks in diamond-like carbon is studied experimentally and by means of large-scale molecular dynamics simulations with 5 x 10(6) atoms combined with a thermal spike model. The irradiation experiments with swift heavy ions cover a large electronic stopping range between similar to 12 and 72 keV/nm. Both experiments and simulations show that beyond a stopping power threshold, the hillock height increases linearly with the electronic stopping, and agree extremely well assuming an efficiency of approximately 20% in the transfer of electronic energy to the lattice. The simulations also show a transition of sp(3) to sp(2) bonding along the tracks with the hillocks containing almost no sp(3) contribution.

• 出版日期2012-9-10