Feedback controlled electromigration in four-terminal nano-junctions

Details Feedback controlled electromigration in four-terminal nano-junctions Feedback controlled electromigration in four-terminal nano-junctions

2007-03-25

arxiv.org/abs/cond-mat/0703649v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.2760150

We have developed a fast, yet highly reproducible method to fabricate metallic electrodes with nanometer separation using electromigration (EM). We employ four-terminal instead of two-terminal devices in combination with an analog feedback to maintain the voltage $U$ over the junction constant. After the initialization phase ($U < 0.2V), during which the temperature $T$ increases by 80-150 degs C, EM sets in shrinking the wire locally. This quickly leads to a transition from the diffusive to a quasi-ballistic regime ($0.2V < U < 0.6V). At the end of this second regime, a gap forms (U > 0.6V). Remarkably, controlled electromigration is still possible in the quasi-ballistic regime.

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