Scientific Reports (Nov 2020)

Dynamics of chiral solitons driven by polarized currents in monoaxial helimagnets

  • Victor Laliena,
  • Sebastian Bustingorry,
  • Javier Campo

DOI
https://doi.org/10.1038/s41598-020-76903-8
Journal volume & issue
Vol. 10, no. 1
pp. 1 – 10

Abstract

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Abstract Chiral solitons are one dimensional localized magnetic structures that are metastable in some ferromagnetic systems with Dzyaloshinskii–Moriya interactions and/or uniaxial magnetic anisotropy. Though topological textures in general provide a very interesting playground for new spintronics phenomena, how to properly create and control single chiral solitons is still unclear. We show here that chiral solitons in monoaxial helimagnets, characterized by a uniaxial Dzyaloshinskii–Moriya interaction, can be stabilized with external magnetic fields. Once created, the soliton moves steadily in response to a polarized electric current, provided the induced spin-transfer torque has a dissipative (nonadiabatic) component. The structure of the soliton depends on the applied current density in such a way that steady motion exists only if the applied current density is lower than a critical value, beyond which the soliton is no longer stable.