SFB 767 - TP C10 Control of magnetic nanostructures by spin currents and thermal gradients

Institutions
  • WG Nowak (Theoretische Physik mit SP Moderne Materialeigenschaften)
Publications
    Schirm, Christian; Matt, Manuel; Pauly, Fabian; Cuevas, Juan Carlos; Nielaba, Peter; Scheer, Elke (2013): A current-driven single-atom memory Nature Nanotechnology. 2013, 8(9), pp. 645-648. ISSN 1748-3387. eISSN 1748-3395. Available under: doi: 10.1038/nnano.2013.170

A current-driven single-atom memory

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The possibility of fabricating electronic devices with functional building blocks of atomic size is a major driving force of nanotechnology. The key elements in electronic circuits are switches, usually realized by transistors, which can be configured to perform memory operations. Electronic switches have been miniaturized all the way down to the atomic scale. However, at such scales, three-terminal devices are technically challenging to implement. Here we show that a metallic atomic-scale contact can be operated as a reliable and fatigue- resistant two-terminal switch. We apply a careful electromigration protocol to toggle the conductance of an aluminium atomic contact between two well-defined values in the range of a few conductance quanta. Using the nonlinearities of the current–voltage characteristics caused by superconductivity in combination with molecular dynamics and quantum transport calculations, we provide evidence that the switching process is caused by the reversible rearrangement of single atoms. Owing to its hysteretic behaviour with two distinct states, this two-terminal switch can be used as a non-volatile information storage element.

Origin (projects)

Funding sources
Name Finanzierungstyp Kategorie Project no.
SFB third-party funds research funding program 826/11
Further information
Period: 01.01.2012 – 31.12.2019