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Ultra-fast artificial neuron: generation of picosecond-duration spikes in a current-driven antiferromagnetic auto-oscillator

Journal article
Authors Roman Khymyn
I. Lisenkov
J. Voorheis
O. Sulymenko
O. Prokopenko
V. Tiberkevich
Johan Åkerman
A. Slavin
Published in Scientific Reports
Volume 8
ISSN 2045-2322
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1038/s41598-018-33697...
Keywords comb generator, laser, solitons, nio
Subject categories Condensed Matter Physics

Abstract

We demonstrate analytically and numerically, that a thin film of an antiferromagnetic (AFM) material, having biaxial magnetic anisotropy and being driven by an external spin-transfer torque signal, can be used for the generation of ultra-short "Dirac-delta-like" spikes. The duration of the generated spikes is several picoseconds for typical AFM materials and is determined by the inplane magnetic anisotropy and the effective damping of the AFM material. The generated output signal can consist of a single spike or a discrete group of spikes ("bursting"), which depends on the repetition (clock) rate, amplitude, and shape of the external control signal. The spike generation occurs only when the amplitude of the control signal exceeds a certain threshold, similar to the action of a biological neuron in response to an external stimulus. The "threshold" behavior of the proposed AFM spike generator makes possible its application not only in the traditional microwave signal processing but also in the future neuromorphic signal processing circuits working at clock frequencies of tens of gigahertz.

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