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(a) Field-emission SEM micrograph of electrodes before electromigration. (b) Nanogap after electromigration.
(a) data from a succession of ramps across a junction. Arrows indicate how evolves as the nanogap forms. The ramp up shows the initial ohmic behavior of leads and the downward pattern is the electromigration. (b) Same data with plotted on log scale.
Fit of Joule-heating model [Eq. (1)] to the electromigration of Au leads.
(a) Jumps and plateaus in of a metallic neck formed to with the controlled electromigration procedure. The measurements were performed at . Time equal to zero corresponds to the point when the voltage reached . (b) Expanded view of data at location where falls below .
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