Cohesive energy effects on the atomic transport induced by ion beam mixing

Abstract

Atomic transport in the radiation enhanced diffusion (RED) region has been studied from the shifts of a marker layer in ion beam mixed Pd Co and Pd Au bilayers. 80 keV Ar + with a dose of 1.5 × 10 16 ions/cm 2 were irradiated into the bilayers at temperature region from 90 K to 700 K. In the Pd Co system, the atomic flux of Pd ( J Pd) transported across the interface is nearly same with J Co in the thermal spike region, while J Pd is always larger than J Co in the RED regio However, in the Pd Au system, J Pd is nearly same with J Au in both of the thermal spike and RED regions. We have developed a model to describe the atomic transport in the RED region, which predicts that the atom with small cohesive energy has more mobility than that with large cohesive energy.