Determination of chirality and density control of Néel-type skyrmions with in-plane magnetic field
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2018-07-17
Print Publication Date2018-12
Permanent link to this recordhttp://hdl.handle.net/10754/630745
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AbstractMagnetic skyrmions are topologically protected nanoscale spin textures exhibiting fascinating physical behaviors. Recent observations of room temperature Néel-type skyrmions in magnetic multilayer films are an important step towards their use in ultra-low power devices. Here, we investigate the magnetization reversal in [Pt/Co/Ta]n multilayer samples under a tilted magnetic field using in-situ Lorentz transmission electron microscopy. On decreasing the magnetic field, individual skyrmions appear to subsequently evolve into snake-like structures growing in the direction opposite to the in-plane magnetic field. We show that this unusual relation between the velocity vector and the magnetic field is dominated by the chirality of the Néel-type skyrmions. It allows one to extract the sign of the Dzyaloshinskii–Moriya constant. We also demonstrate that high concentration of skyrmions can be achieved on increasing the in-plane component of the field or increasing the disorder of the film. Our micromagnetic simulations agree with our experimental results.
CitationZhang S, Zhang J, Wen Y, Chudnovsky EM, Zhang X (2018) Determination of chirality and density control of Néel-type skyrmions with in-plane magnetic field. Communications Physics 1. Available: http://dx.doi.org/10.1038/s42005-018-0040-5.
SponsorsThis publication is based on research supported by the King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) and under the Award No. OSR-2016-CRG5-2977.