Influence of levy noise on subthreshold synchronization of spintronic stochastic neurons

• Published in: Results in physics 2021-08, Vol.27, p.104475, Article 104475
• Main Authors: Liao, Zhiqiang, Ma, Kaijie, Tang, Siyi, Shamim Sarker, Md, Yamahara, Hiroyasu, Tabata, Hitoshi
• Format: Article
• Language: English
• Subjects: Levy noise; Spintronic stochastic neurons; Subthreshold synchronization; Superparamagnetic tunnel junctions
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2021.104475

•Numerical investigation of levy noise influence on subthreshold SMTJ synchronization.•Levy noise pulse can weaken the stability of the subthreshold synchronization of SMTJ.•Enhancement of noise asymmetry promotes SMTJ subthreshold synchronization. Superparamagnetic tunnel junctions (SMTJs) are spintronic nanodevices that can oscillate spontaneously under the influence of thermal noise. Studies have proposed that SMTJs can be modeled as magnetic neurons by subjecting them to electrical Gaussian white noise and can be subsequently synchronized under subthreshold driving. Considering the non-Gaussian background noise in industrial applications, this study investigated the influence of levy noise on SMTJ subthreshold synchronization. The results revealed that levy noise with weak pulse characteristics can be used to promote the subthreshold synchronization of the SMTJs, whereas levy noise with enhanced pulse characteristics cannot be used. Under the same conditions, enhanced levy noise asymmetry is advantageous for achieving SMTJ synchronization under subthreshold driving.