Stochastic Computing Implemented by Skyrmionic Logic Devices

Abstract

Magnetic skyrmion, topologically non-trivial spin texture, has been considered as promising information carrier in future electronic devices because of its nanoscale size, low depinning current density and high motion velocity. Despite the broad interests in skyrmion racetrack memory, researchers have been recently exploiting logic functions enabled by using the particle-like behaviors of skyrmions. These functions can be applied to unconventional computing, such as stochastic computing (SC), which treats data as probabilities and is superior to binary computing due to its simplicity of logic operation. In this work, we demonstrate SC implemented by skyrmionic logic devices. We propose a skyrmionic AND-OR logic device as a multiplier in the stochastic domain and two skyrmionic multiplexer (MUX) logic devices as stochastic adders. With the assist of voltage controlled magnetic anisotropy (VCMA), the precise control of skyrmions collision is not required in the skyrmionic AND-OR logic device, thus improving the operation robustness. In the two MUX logic devices, skyrmions can be driven by Zhang-Li torque or spin orbit torque (SOT). Particularly, we can flexibly regulate the skyrmion motion by VCMA or voltage controlled Dzyaloshinskii-Moriya Interaction (VCDMI) in the SOT case. Furthermore, 3-bit stochastic multiplier and adder are demonstrated by micromagnetic simulations. In addition, simulations in synthetic antiferromagnets (SAF) show that the performance of our skyrmionic logic gates can be optimized through advanced materials. Our work opens up perspective to implement SC using skyrmionic logic devices.

References in corpus (30)

• Skyrmion Lattice in a Chiral Magnet
• The design and verification of Mumax3
• Blowing Magnetic Skyrmion Bubbles
• Roles of non-equilibrium conduction electrons on magnetization dynamics of ferromagnets
• Direct Observation of the Skyrmion Hall Effect
• Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Micromagnetic understanding of current-driven domain wall motion in patterned nanowires
• Room temperature chiral magnetic skyrmion in ultrathin magnetic nanostructures
• Current-induced skyrmion dynamics in constricted geometries
• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions
• Static and Dynamical Properties of Antiferromagnetic Skyrmions in the Presence of Applied Current and Temperature
• Magnetic skyrmion artificial synapse for neuromorphic computing
• Magnetic bilayer-skyrmions without skyrmion Hall effect
• Dynamics of Skyrmion Crystals in Metallic Thin Films
• Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory
• Full phase diagram of isolated skyrmions in a ferromagnet
• Thermal skyrmion diffusion applied in probabilistic computing
• Current-induced skyrmion generation and dynamics in symmetric bilayers
• p-Bits for Probabilistic Spin Logic
• Diameter-independent skyrmion Hall angle in the plastic flow regime observed in chiral magnetic multilayers
• Skyrmion Logic System for Large-Scale Reversible Computation
• Thermally stable magnetic skyrmions in multilayer synthetic antiferromagnetic racetracks
• Complementary Skyrmion Racetrack Memory with Voltage Manipulation
• Energy-efficient stochastic computing with superparamagnetic tunnel junctions
• Topological spin Hall effects and tunable skyrmion Hall effects in uniaxial antiferromagnetic insulators
• Modeling the shape of axisymmetric skyrmions in magnetic multilayers
• Deflection of (anti)ferromagnetic skyrmions at heterochiral interfaces
• SPINBIS: Spintronics based Bayesian Inference System with Stochastic Computing

Cited by in corpus (17)

• Topological insulators and semimetals in classical magnetic systems
• Computing and Memory Technologies based on Magnetic Skyrmions
• Antiferromagnetic Skyrmion-Based Logic Gates Controlled by Electric Currents and Fields
• Perspective on unconventional computing using magnetic skyrmions
• Programmable skyrmion logic gates based on skyrmion tunneling
• Self focusing Hybrid Skyrmions in spatially varying canted ferromagnetic systems
• Chiral Spin Textures for Next-Generation Memory and Unconventional Computing
• Robust and programmable logic-in-memory devices exploiting skyrmion confinement and channeling using local energy barriers
• Dynamics and Nonmonotonic Drag for Individually Driven Skyrmions
• Experimental Evidence of a change of Exchange Anisotropy Sign with Temperature in Zn-Substituted Cu2OSeO3
• Role of magnetic skyrmions for the solution of the shortest path problem
• Dynamics of asymmetrically deformed skyrmion driven by internal forces and strain force in a flower-shaped magnetic nanostructure
• Enhanced skyrmion metastability under applied strain in FeGe
• Nonuniform magnetic domain-wall synapses enabled by population coding
• Skyrmions in an oblique field: A path to novel binary and quaternary memory
• Topological transition and emergent elasticity of dislocation in skyrmion lattice: Beyond Kittel's magnetic-polar analogy
• Fresnel Magnetic Imaging of Ultrasmall Skyrmion Lattices