Current-induced nucleation and dynamics of skyrmions in a Co-based Heusler alloy

Abstract

We demonstrate room-temperature stabilization of dipolar magnetic skyrmions with diameters in the range of $100$ nm in a single ultrathin layer of the Heusler alloy Co${}_2$FeAl (CFA) under moderate magnetic fields. Current-induced skyrmion dynamics in microwires is studied with a scanning Nitrogen-Vacancy magnetometer operating in the photoluminescence quenching mode. We first demonstrate skyrmion nucleation by spin-orbit torque and show that its efficiency can be significantly improved using tilted magnetic fields, an effect which is not specific to Heusler alloys and could be advantageous for future skyrmion-based devices. We then show that current-induced skyrmion motion remains limited by strong pinning effects, even though CFA is a magnetic material with a low magnetic damping parameter.

arXiv comment5 pages, 4 figures

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Cited by in corpus (14)

• Statics and Dynamics of Skyrmions Interacting with Pinning: A Review
• Imaging non-collinear antiferromagnetic textures via single spin relaxometry
• Skyrmion pinning energetics in thin film systems
• Room temperature skyrmions at zero field in exchange-biased ultrathin films
• Characterization of room-temperature in-plane magnetization in thin flakes of CrTe${}_2$ with a single spin magnetometer
• Current-Controlled Topological Magnetic Transformations in a Nanostructured Kagome Magnet
• Quantitative study of the response of a single NV defect in diamond to magnetic noise
• Deterministic generation of skyrmions and antiskyrmions by electric current
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• Single-spin scanning magnetic microscopy with radial basis function reconstruction algorithm
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