Double MgO-Based Perpendicular Magnetic Tunnel Junction for Artificial Neuron.

A perpendicular spin transfer torque (p-STT)-based neuron was developed for a spiking neural network (SNN). It demonstrated the integration behavior of a typical neuron in an SNN; in particular, the integration behavior corresponding to magnetic resistance change gradually increased with the input spike number. This behavior occurred when the spin electron directions between double CoFeB free and pinned layers in the p-STT-based neuron were switched from parallel to antiparallel states.