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

Authors :
Roman Khymyn
Ivan Lisenkov
James Voorheis
Olga Sulymenko
Oleksandr Prokopenko
Vasil Tiberkevich
Johan Akerman
Andrei Slavin
Source :
Scientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
Publication Year :
2018
Publisher :
Nature Portfolio, 2018.

Abstract

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.

Details

Language :
English
ISSN :
20452322
Volume :
8
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Scientific Reports
Publication Type :
Academic Journal
Accession number :
edsdoj.29153fdad5f54ccfa85e888803789734
Document Type :
article
Full Text :
https://doi.org/10.1038/s41598-018-33697-0