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    Controlling the deformation of antiferromagnetic skyrmions in the high-velocity regime

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    Type
    Article
    Authors
    Salimath, Akshaykumar
    Zhuo, Fengjun cc
    Tomasello, R. cc
    Finocchio, G.
    Manchon, Aurelien cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2020-01-31
    Submitted Date
    2019-07-24
    Permanent link to this record
    http://hdl.handle.net/10754/661355
    
    Metadata
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    Abstract
    While antiferromagnetic skyrmions display appealing properties, their lateral expansion in the high-velocity regime hinders their potential for applications. In this work, we study the impact of spin Hall torque, spin transfer torque, and topological torque on the velocity-current relation of antiferromagnetic skyrmions with the aim of reducing this deformation. Using a combination of micromagnetic simulations and analytical derivations, we demonstrate that the lateral expansion of the antiferromagnetic skyrmion is reminiscent of the well-known Lorentz contraction identified in one-dimensional antiferromagnetic domain walls. We also show that in the flow regime the lateral expansion is accompanied by a progressive saturation of the skyrmion velocity when driven by spin Hall and topological torques. This saturation occurs at much smaller velocities when driven by the topological torque, while the lateral expansion is reduced, preventing the skyrmion size from diverging at large current densities. We extend this study toward synthetic antiferromagnets, where the weaker antiferromagnetic exchange leads to much larger lateral expansion at smaller current densities in all cases. This study suggests that a compromise must be made between skyrmion velocity and lateral expansion during the device design. In this respect, exploiting the topological torque could lead to better control of the skyrmion velocity in antiferromagnetic racetracks.
    Citation
    Salimath, A., Zhuo, F., Tomasello, R., Finocchio, G., & Manchon, A. (2020). Controlling the deformation of antiferromagnetic skyrmions in the high-velocity regime. Physical Review B, 101(2). doi:10.1103/physrevb.101.024429
    Sponsors
    The authors acknowledge fruitful discussions with A. Abbout, C. A. Akosa, J.-V. Kim, and A. Thiaville. A.S., F.Z., and A.M. were supported by the King Abdullah University of Science and Technology (KAUST). R.T. and G.F. acknowledge the project ThunderSKY, funded by the Hellenic Foundation for Research and Innovation (HFRI) and the General Secretariat for Research and Technology (GSRT), under Grant Agreement No. 871.
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/physrevb.101.024429
    Additional Links
    https://link.aps.org/doi/10.1103/PhysRevB.101.024429
    ae974a485f413a2113503eed53cd6c53
    10.1103/physrevb.101.024429
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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