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    Spin-torque nano-oscillators for reservoir computing applied to time-series data

    R. Arun1,2,*, M. Sathish Aravindh3,†, and M. Lakshmanan3,‡

    • 1Center for Nonlinear and Complex Networks, SRM TRP Engineering College, Tiruchirappalli–621 105, Tamil Nadu, India
    • 2Center for Research, Easwari Engineering College, Chennai–600 089, Tamil Nadu, India
    • 3Department of Nonlinear Dynamics, School of Physics, Bharathidasan University, Tirchirappalli–620 024, Tamil Nadu, India

    • *Contact author: arunbdu@gmail.com
    • †Contact author: sathisharavindhm@gmail.com
    • ‡Contact author: lakshman.cnld@gmail.com

    Phys. Rev. E 112, 015307 – Published 29 July, 2025

    DOI: https://doi.org/10.1103/f2f3-l3fc

    Abstract

    Recent investigations have discovered the potential of high-dimensional nonlinear systems for predicting nontemporal and temporal tasks. The prediction is demonstrated here for an asymmetrical seventh-degree polynomial and time series of variables in Rössler system by using spin-torque nano oscillator (STNO) as a reservoir corresponding to the nontemporal and temporal tasks, respectively. For training, the inputs are supplied through the bifurcation parameters, (i) magnitude of the alternating current (AC) passed through the STNO and (ii) the frequency with which the AC is applied. The computed values of root-mean-square error affirms that the STNO is a good candidate for the role of reservoir in reservoir computing. Further the output is predicted close to the target even in the presence of noise. The performance of the reservoir is investigated against the hyperparameters for both the nontemporal and temporal tasks. The performance of the reservoir is quite robust in the presence of thermal noise and the accuracy is maintained even at higher temperatures.

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