AVS 45th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS1-WeA

Paper SS1-WeA4
Theory of Surface Electromigration on Metals

Wednesday, November 4, 1998, 3:00 pm, Room 308

Session: Electromigration and Surface Transport
Presenter: P.J. Rous, University of Maryland, Baltimore County
Authors: P.J. Rous, University of Maryland, Baltimore County
D.N. Bly, University of Maryland, Baltimore County
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We describe the application of layer-KKR theory to the calculation of the driving force for adatom electromigration on metallic surfaces. We find that the dominant component of the force arises from momentum transfer to the adatom from the charge carriers; the so-called wind force. We have computed the direction and magnitude of the driving force for electromigration along typical migration pathways on low Miller index surfaces. Averaging the force felt by an adatom traversing these paths permits the calculation of the effective wind valence Z@sub w@. By comparing Z@sub w@ for impurity and self-electromigration on various substrates we have correlated the magnitude of the driving force with the local carrier density and the adatom transport cross-section. For migration of isolated adatoms, we find that the ballistic model, appropriately modified for the effect of the substrate provides a reasonable qualitative description of the calculated effective valence. @FootnoteText@ This work is supported by the National Science Foundation under Grant No. DMR-9632521