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Bilayer-Skyrmion-Based Design of Neuron and Synapse for Spiking Neural Network

Debasis Das*, Yunuo Cen, Jianze Wang, and Xuanyao Fong†

  • Department of Electrical and Computer Engineering, National University of Singapore 117583, Singapore

  • *eledd@nus.edu.sg
  • †kelvin.xy.fong@nus.edu.sg
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Phys. Rev. Applied 19, 024063 – Published 23 February, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.024063

Abstract

Magnetic skyrmion technology is promising for the next-generation spintronics-based memory and neuromorphic computing due to their small size, nonvolatility and low depinning current density. However, the Magnus force originating from the skyrmion Hall effect causes the skyrmion to move along a curved trajectory, which may lead to the annihilation of the skyrmion in a nanotrack during current-induced skyrmion motion. Consequently, circuits utilizing skyrmionic motion need to be designed to limit the impact of the skyrmion Hall effect. In this work we propose a design of an artificial neuron, and a synapse using the bilayer device consisting of two antiferromagnetically exchange coupled ferromagnetic layers, which achieves robustness against the skyrmion Hall effect by nullifying the Magnus force. Using micromagnetic simulations, we show that the bilayer device can work as an artificial neuron and also as a synapse by modifying its uniaxial anisotropy. We also demonstrate that our proposed skyrmionic synapse has an intrinsic property of a perfectly linear and symmetric weight update, which is highly desirable for the synapse operation. We simulate a spiking neural network implemented using our proposed synapse and neuron and achieve a 96.23% accuracy in performing classification on the modified National Institute of Standards and Technology handwritten digit dataset.

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Physics Subject Headings (PhySH)

Corrections

12 June, 2023

Correction: The omission of an Acknowledgment section has been fixed.

Article Text

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Outline

Information

Phys. Rev. Applied 19, 024063– Published 23 February, 2023
  • Received 4 March 2022
  • Revised 13 May 2022
  • Accepted 2 February 2023
  • Corrected 12 June 2023
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