Optically initialized and current-controlled logical element based on antiferromagnetic-heavy metal heterostructures for neuromorphic computing

Abstract

A concept of optically triggered and electrically controlled ultra-fast neuromorphic computing processor based on an antiferromagnetic/heavy metal (AFM/HM) heterostructure is proposed. The AFM/HM-based artificial neurons are excited with short THz-range pulses, triggering precession in AFM. Bias electric current in the HM layer can be used to modify the resonance frequency of precession. The conversion of the precession into the electric current in the HM-layer occurs via the inverse spin Hall effect. A model of a neuromorphic processor is, thus, proposed, consisting of excitatory AFM-based artificial neurons—oscillators, and processing neurons—detectors. We show that the use of optical excitation can significantly increase the processing speed of neuromorphic computing at low power consumption. Examples of the implementation of the simplest logical operations (OR, AND) are demonstrated.

Designing polar textures with ultrafast neuromorphic features from atomistic simulations

“…This has been recently considered in various materials, e.g. quantum semiconductors [31], resistive switching systems [32], phase change materials [33] or magnetic-based materials [34] to name a few, in a frequency ranging from GHz to THz. Note that the speeds for neuronic and synaptic functions are directly linked to the material-related mechanisms.…”

Spin-orbit torque manipulation of sub-terahertz magnons in antiferromagnetic α-Fe2O3

“…Pioneering efforts to control the magnon frequency have focused on conventional ferromagnetic and ferrimagnetic thin films and two-dimensional exfoliated flakes, whose magnon frequencies reside in tens of GHz [22][23][24][25][26][27][28] . Although theoretical works 15,17,29,30 pointed out that the frequency of the uniform resonant mode (wavevector k = 0 magnon) in antiferromagnets can be controlled by SOT, the experimental demonstration, including propagating magnons (k ≠ 0), has remained elusive.…”