Reservoir Computing on Spin-Torque Oscillator Array

Abstract

We numerically study reservoir computing on a spin-torque oscillator (STO) array, describing magnetization dynamics of the STO array by a nonlinear oscillator model. The STOs exhibit synchronized oscillation due to coupling by magnetic dipolar fields. We show that the reservoir computing can be performed by using the synchronized oscillation state. Its performance can be improved by increasing the number of the STOs. The performance becomes the highest at the boundary between the synchronized and disordered states. Using the STO array, we can achieve higher performance than an echo-state network with similar number of units. This result indicates that the STO array is promising for hardware implementation of reservoir computing.

Reservoir Computing Using a Spin-Wave Delay-Line Active-Ring Resonator Based on Yttrium-Iron-Garnet Film

“…In particular, many studies have already been conducted on spin-torque nano-oscillators with experimental results [10,11,[13][14][15][16] demonstrating promising performance as RC implementations. Further simulations [17,18] indicate the potential for improved performance by using arrays of coupled oscillators. Other proposed spintronic implementations are systems utilising magnetic skyrmion memristors [19] and spin-wave (SW) interference in garnet films [12].…”

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“…Furthermore, recent studies [394], [395], [396], [397], [386] have revealed that reservoir computing can also be performed based on mutually coupled magnonic oscillators using synchronization effects. Synchronization is the fundamental nonlinear effect [398] that can drive the magnonic oscillator network to a collective state, where the phases and frequencies of oscillators are equal or may differ by a constant.…”

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“…Many currently discussed assets of physical reservoirs can be understood from this perspective. In particular, spintronics devices have been gaining attention as an appropriate substrate for PRC because of their compactness, high-speed processing, and energy efficiency while being able to function at normal temperatures [73][74][75][76][78][79][80][81][82][83][84][85]. These assets are somewhat common in the computer science field, but spintronics devices also contain an inter- esting additional property: they show high durability in radioactive environments [183] (Fig.…”