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Dynamic Transformation of Domain Walls in Chiral Ferrimagnets

  • ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
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Abstract

The dynamics of domain walls in ferrimagnets in which spatial dynamics invariance is violated because of the presence of the chiral Dzyaloshinskii–Moriya interaction with energy linear in sublattice spin density gradients is investigated theoretically. Analysis is performed based on numerical integration of equations in the sigma model generalized to the case of a ferrimagnet near the sublattice spin compensation point. It is shown that in contrast to conventional or chiral ferromagnets, chiral ferrimagnets can exhibit effects of dynamic transformation of the domain wall structure with the formation of more complex walls with a nonmonotonic behavior of the spin density in a wall upon an increase in the wall velocity. These effects are possible in a quite narrow neighborhood of the compensation point, and the width of this region increases upon an increase in the Dzyaloshinskii–Moriya interaction constant.

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ACKNOWLEDGMENTS

The author is grateful to B.A. Ivanov and L.M. Lerman for their cooperation and fruitful discussions.

Funding

This work was supported by the Russian Science Foundation (project no. 22-11-00027).

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    N. E. Kulagin

  2. National Research University “Higher School of Economics”, 101000, Moscow, Russia

    N. E. Kulagin

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  1. N. E. Kulagin
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Correspondence to N. E. Kulagin.

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Translated by N. Wadhwa

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Kulagin, N.E. Dynamic Transformation of Domain Walls in Chiral Ferrimagnets. J. Exp. Theor. Phys. 136, 312–320 (2023). https://doi.org/10.1134/S1063776123030159

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  • DOI: https://doi.org/10.1134/S1063776123030159

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