Skyrmion Signal Reshuffler      

ABSTRACT

The topologically protected magnetic spin configurations known as skyrmions offer promising applications due to their stability, mobility and localization. In this work, we propose a skyrmion gas-mediated signal reshuffler within the well-established framework of micromagnetics, through which a detailed modelling of the long-range skyrmion-skyrmion interactions paired with their individual thermal diffusion is used to transform a telegraph noise signal into an uncorrelated copy of itself. Our results serve as a proof-of-concept for a compact device inheriting all the scaling and low-energy advantages afforded by the spintronics toolbox. Whereas its immediate application to stochastic computing circuit designs will be made apparent, we argue that its basic functionality, reminiscent of an integrate-and-fire neuron, qualifies it as a novel bio-inspired building block. 

INTRODUCTION


Magnetic skyrmions promise unique opportunities for the processing, storage and transfer of information by means of ultrathin metallic nanostructures at the intersection of both spintronics and nanoelectronics [Fert 2013Nagaosa 2013Sampaio 2013,Iwasaki 2013, Zhang 2015Koshibae 2015].  They appear ubiquitously in diverse systems whenever the competition between Dzyaloshinski-Moriya interaction (DMI) and other magnetic energy contributions result in an equilibrium spin texture that is strongly adverse to deformations. As a result, skyrmions are exceptionally stable structures capable of withstanding room-temperature environments [Jiang 2015Woo 2016] and being manipulated at extremely small current densities ( \(\sim 10^{6}\mathrm{A}/\mathrm{m}^2\)) with negligible ohmic heating as compared to domain walls [