LAS-NCS: A Laser-Assisted Spintronic Neuromorphic Computing System

In spintronic-based neuromorphic computing systems (NCSs), the switching of magnetic moment in a magnetic tunnel junction (MTJ) is used to mimic biological neuron firing. However, the high currents required for MTJ switching will lead to a large energy consumption and low speed operation of the MTJ-...

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Veröffentlicht in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2019-05, Vol.66 (5), p.838-842
Hauptverfasser: Farkhani, Hooman, Prejbeanu, Ioan Lucian, Moradi, Farshad
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Prejbeanu, Ioan Lucian
Moradi, Farshad
description In spintronic-based neuromorphic computing systems (NCSs), the switching of magnetic moment in a magnetic tunnel junction (MTJ) is used to mimic biological neuron firing. However, the high currents required for MTJ switching will lead to a large energy consumption and low speed operation of the MTJ-based NCSs. In this brief, the energy consumption and the delay of the proposed MTJ-based NCS are reduced by thermally assisting the MTJ switching through a microwatt nanosecond laser pulse. Simulation results show 85.7%, 84%, and 97.8% improvements in energy consumption, delay, and energy-delay product, respectively, for the laser-assisted spintronic NCS (LAS-NCS) by heating the MTJs up to 127 °C. The energy consumption of the laser pulse for heating up the MTJ stack is 1.2×-2.4× lower than Joule heating method. Moreover, in contrast with Joule heating method, the LAS-NCS does not require MTJ with modified structure.
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subjects Computation
Computer simulation
COMSOL multiphysics
Delay
Energy consumption
energy efficient
Heating systems
laser
Laser beam heating
Lasers
Low speed
Magnetic moments
Magnetic tunneling
Memristors
MTJ
Neuromorphic computing
Neuromorphic computing system
Ohmic dissipation
Resistance
Resistance heating
Switches
Switching
Tunnel junctions
Vertical cavity surface emitting lasers
title LAS-NCS: A Laser-Assisted Spintronic Neuromorphic Computing System
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