High-Bias Instability of Atomic and Molecular Junctions

Sakai, Akira

doi:10.5772/17956

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Experiments On the Admittance Of Atom-sized Contacts Of M1

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2018

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“…Finally, I note that time-varying biases play an important role not only in signal transmission but also in contact stability. Single-atom metal contacts become destabilized at high biases and exhibit a current-induced breakdown [ 61 ]. One of probable failure mechanisms is electromigration (EM).…”

Section: Experiments On the Admittance Of Atom-sized Contacts Of Mmentioning

confidence: 99%

Admittance of Atomic and Molecular Junctions and Their Signal Transmission

Sakai

2018

Micromachines

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Atom-sized contacts of metals are usually characterized by their direct current (DC) conductance. However, when atom-sized contacts are used as device interconnects and transmit high frequency signals or fast pulses, the most critical parameter is not their DC conductance but their admittance Y(ω), in particular its imaginary part Im0.166667emY(ω). In this article, I will present a brief survey of theoretical and experimental results on the magnitude of Y(ω) for atom-sized contacts of metals. Theoretical contact models are first described and followed by numerical evaluation of Im0.166667emY(ω) based on these models. As for experiments on Y(ω), previous experiments conducted under time-varying biases are surveyed, and then the results of direct signal transmission through atom-sized contacts are discussed. Both theoretical and experimental results indicate that Im0.166667emY(ω) is negligibly small for typical atom-sized contacts for signal frequencies up to 1 GHz.

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Section: Experiments On the Admittance Of Atom-sized Contacts Of Mmentioning

confidence: 99%