| We investigate nanocontact formation by thermally assisted electromigration of gold nanowires. Automatic feed-back allows to follow a line of constant dissipated power at the nanocontact up to resistances corresponding to 10 to 20 conductance quanta. The contacts are thinned in a controlled way by voltage induced heating. In the ballistic regime, oscillations of the conductance histogrammes show that the material properties of the nanocontacts are similar to work-hardened gold. |
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