Radio-Frequency Spintronic Neural Networks

Spintronic nano-synapses and nano-neurons are complex cognitive devices that have high accuracy due to their reproducible and controllable magnetization dynamics. They have the potential to revolutionize artificial intelligence hardware, but currently, there is no scalable way to connect them in multilayers. We show that magnetic tunnel junctions can be used to connect spintronics components in multilayer neural networks, allowing them to function as both synapses and neurons. We build a two-layer hardware spintronic neural network using nine magnetic tunnel junctions and found that it could classify nonlinearly-separable RF inputs with an accuracy of 97.7%. We also demonstrate that a larger network of these junctions could identify drones from their RF transmissions while consuming minimal power. This study lays the foundation for the development of deep, dynamical, spintronic neural networks [1].