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Ultra-fast artificial neuron: generation of picosecond-duration spikes in a current-driven antiferromagnetic auto-oscillator
Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden..
Oregon State Univ, Dept Elect Engn & Comp Sci, Corvallis, OR 97331 USA.;Northeastern Univ, Elect & Comp Engn Dept, Boston, MA 02464 USA..
Oakland Univ, Dept Phys, Rochester, MI 48309 USA..
Taras Shevchenko Natl Univ Kyiv, Fac Radiophys Elect & Comp Syst, UA-01601 Kiev, Ukraine..
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 15727Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 8, article id 15727
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Physical Sciences
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URN: urn:nbn:se:kth:diva-238531DOI: 10.1038/s41598-018-33697-0ISI: 000448109000052PubMedID: 30356104OAI: oai:DiVA.org:kth-238531DiVA, id: diva2:1260987
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QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved

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Åkerman, Johan

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