Controllable SiOx Nanorod Memristive Neuron for Probabilistic Bayesian Inference

Modern artificial neural network technology using a deterministic computing framework is faced with a critical challenge in dealing with massive data that are largely unstructured and ambiguous. This challenge demands the advances of an elementary physical device for tackling these uncertainties. Here, we designed and fabricated a SiOx nanorod memristive device by employing the glancing angle deposition (GLAD) technique, suggesting a controllable stochastic artificial neuron that can mimic the fundamental integrate-and-fire signaling and stochastic dynamics of a biological neuron. The nanorod structure provides the random distribution of multiple nanopores all across the active area, capable of forming a multitude of Si filaments at many SiOx nanorod edges after the electromigration process, leading to a stochastic switching event with very high dynamic range (approximate to 5.15 x 10(10)) and low energy (approximate to 4.06 pJ). Different probabilistic activation (ProbAct) functions in a sigmoid form are implemented, showing its controllability with low variation by manufacturing and electrical programming schemes. Furthermore, as an application prospect, based on the suggested memristive neuron, we demonstrated the self-resting neural operation with the local circuit configuration and revealed probabilistic Bayesian inferences for genetic regulatory networks with low normalized mean squared errors (approximate to 2.41 x 10(-2)) and its robustness to the ProbAct variation.

Automated summary

Researchers designed and fabricated a SiOx nanorod memristive device using the GLAD technique, proposing a controllable stochastic artificial neuron that mimics the signaling and dynamics of a biological neuron. By implementing ProbAct functions and electrical programming schemes, control over the neuron is achieved, allowing for probabilistic Bayesian inferences in genetic regulatory networks.