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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Skyrmions III (joint session MA/TT/KFM)

KFM 17.14: Talk

Wednesday, March 14, 2018, 18:15–18:30, EB 301

Reservoir Computing with Random Skyrmion Fabrics — •Daniele Pinna¹, George Bourianoff², and Karin Everschor-Sitte¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany — ²Intel Labs, Intel Corp, Austin, TX

Thanks to their many nanoscale properties, skyrmions are promising in applications ranging from non-volatile memory[1] and spintronic logic devices[2], to enabling the implementation of unconventional computational standards[3, 4]. In this talk we will discuss how a random skyrmion ``fabric'' composed of skyrmion clusters embedded in a magnetic substrate can be effectively employed to implement a functional reservoir computer. This is achieved by leveraging the nonlinear resistive response of the individual skyrmions arising from their current dependent AMR[5]. Complex time-varying current signals injected via contacts into the magnetic substrate are shown to be modulated nonlinearly by the fabric's AMR due to the current distribution following paths of least resistance as it traverses the geometry. By tracking resistances across multiple input and output contacts, we show how the instantaneous current distribution, reminiscent of Atomic Switch Networks, effectively carries temporally correlated information about the injected signal. This in turn allows us to numerically demonstrate simple pattern recognition.

[1] A. Fert, et al., Nature Nanotech. 8, 152-156 (2013). [2] X. Zhang, et al., Sci. Rep. 5, 9400 (2015). [3] D. Pinna, et al., arXiv:1701.07750 (2017). [4] G. Bourianoff, et al., arXiv:1709.08911 (2017). [5] D. Prychynenko, et al., arXiv:1702.04298 (2017).