Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-33697-0
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Funding
- Knut and Alice Wallenberg Foundation (KAW)
- NSF of the USA [EFMA- 1641989, ECCS-1708982]
- DARPA M3IC Grant [W911-17-C-0031]
- State Fund for Fundamental Research of Ukraine [F 78, F 76]
- Taras Shevchenko National University of Kyiv [16BF052-01, 18BF052-01M]
- National Academy of Sciences of Ukraine [7F]
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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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