Performance of synthetic antiferromagnetic racetrack memory: domain wall vs skyrmion

Abstract

A storage scheme based on racetrack memory, where the information can be coded in a domain or a skyrmion, seems to be an alternative to conventional hard disk drive for high density storage. Here, we perform a full micromagnetic study of the performance of synthetic antiferromagnetic (SAF) racetrack memory in terms of velocity and sensitivity to defects by using experimental parameters. We find that to stabilize a SAF skyrmion, the Dzyaloshinskii-Moriya Interaction in the top and the bottom ferromagnet should have an opposite sign. The velocity of SAF skyrmion and SAF Neel domain wall are of the same order and can reach values larger than 1200 m/s if a spin-orbit torque from the spin-Hall effect with opposite sign is applied to both ferromagnets.

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• Theory of Topological Spin Hall Effect in Antiferromagnetic Skyrmion: Impact on Current-induced Motion
• Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer
• Micromagnetic modeling of Terahertz oscillations in an antiferromagnetic material driven by spin-Hall effect
• Coexistence of distinct skyrmion phases observed in hybrid ferromagnetic/ferrimagnetic multilayers
• Dynamics of domain walls motion driven by spin-orbit torque in antiferromagnets
• Current-Driven Dynamics of Frustrated Skyrmions in a Synthetic Antiferromagnetic Bilayer
• Homochiral antiferromagnetic merons, antimerons and bimerons realized in synthetic antiferromagnets
• Current-induced dynamics of skyrmion tubes in synthetic antiferromagnetic multilayers
• Micromagnetic understanding of the skyrmion Hall angle current dependence in perpendicular magnetized ferromagnets
• Disclosing the nature of asymmetric interface magnetism in Co/Pt multilayers
• Material systems for FM-/AFM-coupled skyrmions in Co/Pt-based multilayers
• Temporal Memory with Magnetic Racetracks
• Configurable pixelated skyrmions on nanoscale magnetic grids
• Direct observation of Néel-type skyrmions and domain walls in a ferrimagnetic DyCo${}_3$ thin film
• Controlled anisotropic dynamics of tightly bound skyrmions in a synthetic ferrimagnet due to skyrmion-deformation mediated by induced uniaxial in-plane anisotropy
• Robust and programmable logic-in-memory devices exploiting skyrmion confinement and channeling using local energy barriers
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• Role of magnetic skyrmions for the solution of the shortest path problem
• A spin model for intrinsic antiferromagnetic skyrmions on a triangular lattice
• Nano-engineering the evolution of skyrmion crystal in synthetic antiferromagnets
• Tuning the coexistence regime of incomplete and tubular skyrmions in ferro/ferri/ferromagnetic trilayers
• Topological transport of vorticity on curved magnetic membranes
• Topological Aspects of Antiferromagnets
• The relation between the radii and the densities of magnetic skyrmions
• Nanoscale control of perpendicular magnetic anisotropy, interfacial Dzyaloshinskii-Moriya interaction and skyrmions in the inversion-symmetry-broken Ru/Co/W/Ru films
• Beyond conventional skyrmions in synthetic antiferromagnets
• Crescent domain-wall pairs in anisotropic two-dimensional MnOI monolayer with fast dynamics