Easy-plane spin Hall nano-oscillators as spiking neurons for neuromorphic computing

We show analytically using a macrospin approximation that easy-plane spin Hall nano-oscillators excited by a spin-current polarized perpendicularly to the easy-plane have phase dynamics analogous to that of Josephson junctions. Similarly to Josephson junctions, they can reproduce the spiking behavio...

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Bibliographic Details
Published in:arXiv.org 2021-10
Main Authors: Marković, Danijela, Daniels, Matthew W, Sethi, Pankaj, Kent, Andrew D, Stiles, Mark D, Grollier, Julie
Format: Article
Language:English
Subjects:
Anisotropy
Josephson junctions
Neural networks
Neuromorphic computing
Neurons
Oscillators
Spiking
Online Access:Get full text
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Summary:We show analytically using a macrospin approximation that easy-plane spin Hall nano-oscillators excited by a spin-current polarized perpendicularly to the easy-plane have phase dynamics analogous to that of Josephson junctions. Similarly to Josephson junctions, they can reproduce the spiking behavior of biological neurons that is appropriate for neuromorphic computing. We perform micromagnetic simulations of such oscillators realized in the nano-constriction geometry and show that the easy-plane spiking dynamics is preserved in an experimentally feasible architecture. Finally we simulate two elementary neural network blocks that implement operations essential for neuromorphic computing. First, we show that output spikes energies from two neurons can be summed and injected into a following layer neuron and second, we demonstrate that outputs can be multiplied by synaptic weights implemented by locally modifying the anisotropy.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.06737