Sub-nanosecond signal propagation in anisotropy-engineered nanomagnetic logic chains

Nature Communications
Zheng GuJeffrey Bokor

Abstract

Energy efficient nanomagnetic logic (NML) computing architectures propagate binary information by relying on dipolar field coupling to reorient closely spaced nanoscale magnets. Signal propagation in nanomagnet chains has been previously characterized by static magnetic imaging experiments; however, the mechanisms that determine the final state and their reproducibility over millions of cycles in high-speed operation have yet to be experimentally investigated. Here we present a study of NML operation in a high-speed regime. We perform direct imaging of digital signal propagation in permalloy nanomagnet chains with varying degrees of shape-engineered biaxial anisotropy using full-field magnetic X-ray transmission microscopy and time-resolved photoemission electron microscopy after applying nanosecond magnetic field pulses. An intrinsic switching time of 100 ps per magnet is observed. These experiments, and accompanying macrospin and micromagnetic simulations, reveal the underlying physics of NML architectures repetitively operated on nanosecond timescales and identify relevant engineering parameters to optimize performance and reliability.

References

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Dec 5, 2008·Nano Letters·David B CarltonJeffrey Bokor
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Citations

Apr 6, 2018·Nanotechnology·Hanu AravaLaura J Heyderman
Jul 13, 2017·Nanotechnology·R MansellR P Cowburn
Apr 9, 2016·Physical Review Letters·Duoming WangGuangyu Zhang
Nov 26, 2019·Physical Review Letters·X M ChenJ T Hastings
Sep 17, 2020·Scientific Reports·Scott A MathewsNicholas A Charipar
Dec 26, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Morgan Trassin

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Methods Mentioned

BETA
static magnetic imaging
imaging technique
X-ray
electron microscopy
electron beam lithography

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