Berlin 2005 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 7: Gl
äser I (gemeinsam mit FV DY)

DF 7.2: Vortrag

Montag, 7. März 2005, 10:30–10:45, TU A060

Atomic Dynamics in Molecular Dynamics Simulations of Glassy CuTi Thin Films — •Sebastian Vauth and S.G. Mayr — I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

We present results on atomic dynamics in metallic glass thin films below the glass transition temperature using molecular dynamics simulations. Thin CuTi films of different compositions are prepared by quenching the liquid to an amorphous state. The atomic dynamics on the amorphous surface and inside the bulk of the samples are quantitatively compared by calculating diffusion constants and jump length distributions. We focus on the collective or single particle character of the diffusion mechanism in dependence of the atom type. In addition, single atom exemplifications are analyzed for the different kinds of atomic dynamics. We find that Cu surface atoms diffuse with a single atom jump dynamics, whereas inside the bulk collective behavior dominates for both species. Our investigations are extended to ion irradiation of the surface with an energy of some keV or less. This work is financially supported by the DFG Sonderforschungsbereich 602, TP B3.