A MODEL FOR THE ATOMIC TRANSPORT INDUCED BY THE RADIATION-ENHANCED DIFFUSION

Eighty-keV Ar+ with a dose of 1.5 x 10(16) ion/cm(2) were irradiated i nto the Pd/Co bilayer changing its temperature from 90 K to 700 K in o rder to study the atomic transport in the radiation-enhanced diffusion (RED) region. It was found by measuring the atomic transport across t he interface that the atomic flux of Pd(J(Pd)) is the same as J(Co) in the athermal region while J(Pd) is larger than J(Co) in the RED regio n. Existing models can't explain this phenomena perfectly. Thus, we ha ve developed a new model to describe the atomic transport in the RED r egion, which reveals that atoms with small cohesive energy have more m obility than those with large cohesive energy. This model can predict the dominant moving species under ion-beam mixing more properly than o ther prediction based on the atomic size effect or the radiation damag e density effect.