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 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.
Complex electrical spiking activity in resistive switching nanostructured Au two-terminal devices / M. Mirigliano, D. Decastri, A. Pullia, D. Dellasega, A. Casu, A. Falqui, P. Milani. - In: NANOTECHNOLOGY. - ISSN 0957-4484. - 31:23(2020), pp. 234001.1-234001.13.
|Titolo:||Complex electrical spiking activity in resistive switching nanostructured Au two-terminal devices|
MIRIGLIANO, MATTEO (Primo)
MILANI, PAOLO (Ultimo) (Corresponding)
|Parole Chiave:||cluster-assembled films; neuromorphic devices; resistive switching|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Progetto:||Smart valves based on active soft materials (ASSIST)|
|Data di pubblicazione:||2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1088/1361-6528/ab76ec|
|Appare nelle tipologie:||01 - Articolo su periodico|