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Magnetic skyrmion, topologically non-trivial spin texture, has beenconsidered as promising information carrier in future electronic devicesbecause of its nanoscale size, low depinning current density and high motionvelocity. Despite the broad interests in skyrmion racetrack memory, researchershave been recently exploiting logic functions enabled by using theparticle-like behaviors of skyrmions. These functions can be applied tounconventional computing, such as stochastic computing (SC), which treats dataas probabilities and is superior to binary computing due to its simplicity oflogic operation. In this work, we demonstrate SC implemented by skyrmioniclogic devices. We propose a skyrmionic AND-OR logic device as a multiplier inthe stochastic domain and two skyrmionic multiplexer (MUX) logic devices asstochastic adders. With the assist of voltage controlled magnetic anisotropy(VCMA), the precise control of skyrmions collision is not required in theskyrmionic AND-OR logic device, thus improving the operation robustness. In thetwo MUX logic devices, skyrmions can be driven by Zhang-Li torque or spin orbittorque (SOT). Particularly, we can flexibly regulate the skyrmion motion byVCMA or voltage controlled Dzyaloshinskii-Moriya Interaction (VCDMI) in the SOTcase. Furthermore, 3-bit stochastic multiplier and adder are demonstrated bymicromagnetic simulations. In addition, simulations in syntheticantiferromagnets (SAF) show that the performance of our skyrmionic logic gatescan be optimized through advanced materials. Our work opens up perspective toimplement SC using skyrmionic logic devices.

Stochastic Computing Implemented by Skyrmionic Logic Devices