Complex electrical spiking activity in resistive switching nanostructured Au two-terminal devices

M Mirigliano, D Decastri, A Pullia, D Dellasega, Alberto Casu, Andrea Falqui, P Milani

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Networks of nanoscale objects are the subject of increasing interest as resistive switching systems for the fabrication of neuromorphic computing architectures. Nanostructured films of bare gold clusters produced in gas phase with thickness well beyond the electrical percolation threshold, show a non-ohmic electrical behavior and resistive switching, resulting in groups of current spikes with irregular temporal organization. Here we report the systematic characterization of the temporal correlations between single spikes and spiking rate power spectrum of nanostructured Au two-terminal devices consisting of a cluster-assembled film deposited between two planar electrodes. By varying the nanostructured film thickness we fabricated two different classes of devices with high and low initial resistance respectively. We show that the switching dynamics can be described by a power law distribution in low resistance devices whereas a bi-exponential behavior is observed in the high resistance ones. The measured resistance of cluster-assembled films shows a $1/{{f}}^{{\alpha }}$ scaling behavior in the range of analyzed frequencies. Our results suggest the possibility of using cluster-assembled Au films as components for neuromorphic systems where a certain degree of stochasticity is required.
Original languageEnglish (US)
Pages (from-to)234001
Issue number23
StatePublished - Mar 23 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work has been supported by Fondazione CARIPLO under project ASSIST (2018-1726), under the Program ‘Call to support the knowledge transfer in advanced materials research’.


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