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Effect of Chiral Damping on the dynamics of chiral domain walls and skyrmions

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  • C. K. Safeer

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC
    CIC nanoGUNE BRTA
    Clarendon Laboratory, University of Oxford)

  • Mohamed-Ali Nsibi

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Jayshankar Nath

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Mihai Sebastian Gabor

    (Technical University of Cluj-Napoca)

  • Haozhe Yang

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Isabelle Joumard

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Stephane Auffret

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Gilles Gaudin

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

  • Ioan-Mihai Miron

    (Univ. Grenoble Alpes CNRS, CEA, Grenoble INP, SPINTEC)

Abstract

Friction plays an essential role in most physical processes that we experience in our everyday life. Examples range from our ability to walk or swim, to setting boundaries of speed and fuel efficiency of moving vehicles. In magnetic systems, the displacement of chiral domain walls (DW) and skyrmions (SK) by Spin Orbit Torques (SOT), is also prone to friction. Chiral damping (αc), the dissipative counterpart of the Dzyaloshinskii Moriya Interaction (DMI), plays a central role in these dynamics. Despite experimental observation, and numerous theoretical studies confirming its existence, the influence of chiral damping on DW and SK dynamics has remained elusive due to the difficulty of discriminating from DMI. Here we unveil the effect that αc has on the flow motion of DWs and SKs driven by current and magnetic field. We use a static in-plane field to lift the chiral degeneracy. As the in-plane field is increased, the chiral asymmetry changes sign. When considered separately, neither DMI nor αc can explain the sign reversal of the asymmetry, which we prove to be the result of their competing effects. Finally, numerical modelling unveils the non-linear nature of chiral dissipation and its critical role for the stabilization of moving SKs.

Suggested Citation

  • C. K. Safeer & Mohamed-Ali Nsibi & Jayshankar Nath & Mihai Sebastian Gabor & Haozhe Yang & Isabelle Joumard & Stephane Auffret & Gilles Gaudin & Ioan-Mihai Miron, 2022. "Effect of Chiral Damping on the dynamics of chiral domain walls and skyrmions," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28815-6
    DOI: 10.1038/s41467-022-28815-6
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    References listed on IDEAS

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    1. Seonghoon Woo & Kyung Mee Song & Hee-Sung Han & Min-Seung Jung & Mi-Young Im & Ki-Suk Lee & Kun Soo Song & Peter Fischer & Jung-Il Hong & Jun Woo Choi & Byoung-Chul Min & Hyun Cheol Koo & Joonyeon Cha, 2017. "Spin-orbit torque-driven skyrmion dynamics revealed by time-resolved X-ray microscopy," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    2. A. Hrabec & J. Sampaio & M. Belmeguenai & I. Gross & R. Weil & S. M. Chérif & A. Stashkevich & V. Jacques & A. Thiaville & S. Rohart, 2017. "Current-induced skyrmion generation and dynamics in symmetric bilayers," Nature Communications, Nature, vol. 8(1), pages 1-6, August.
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