Field-induced spin reorientation transitions in antiferromagnetic ring-shaped spin chains

Yelyzaveta A. Borysenko, Denis D. Sheka, Jürgen Fassbender, Jeroen van den Brink, Denys Makarov, and Oleksandr V. Pylypovskyi
Phys. Rev. B 106, 174426 – Published 21 November 2022

Abstract

Easy axis antiferromagnets are robust against external magnetic fields of moderate strength. Spin reorientations in strong fields can provide insight into more subtle properties of antiferromagnetic materials, which are often hidden by their high ground-state symmetry. Here, we investigate theoretically effects of curvature in ring-shaped antiferromagnetic achiral anisotropic spin chains in strong magnetic fields. We identify the geometry-governed helimagnetic phase transition above the spin-flop field between vortex and onion states. The curvature-induced Dzyaloshinskii–Moriya interaction results in the spin-flop transition being of first or second order, depending on the ring curvature. Spatial inhomogeneity of the Néel vector in the spin-flop phase generates weak ferromagnetic response in the plane perpendicular to the applied magnetic field. Our paper contributes to the understanding of the physics of curvilinear antiferromagnets in magnetic fields and guides prospective experimental studies of geometrical effects relying on spin-chain-based nanomagnets.

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  • Received 5 August 2022
  • Revised 9 October 2022
  • Accepted 9 November 2022

DOI:https://doi.org/10.1103/PhysRevB.106.174426

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yelyzaveta A. Borysenko1,2,3, Denis D. Sheka1, Jürgen Fassbender2, Jeroen van den Brink3,4, Denys Makarov2, and Oleksandr V. Pylypovskyi2,5,*

  • 1Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine
  • 2Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany
  • 3Institute for Theoretical Solid State Physics, Leibniz IFW Dresden, 01069 Dresden, Germany
  • 4Institute for Theoretical Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01069 Dresden, Germany
  • 5Kyiv Academic University, 03142 Kyiv, Ukraine

  • *o.pylypovskyi@hzdr.de

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Issue

Vol. 106, Iss. 17 — 1 November 2022

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