Curvilinear one-dimensional antiferromagnets

Antiferromagnets host exotic quasiparticles, support high frequency excitations and are key enablers of the prospective spintronic and spin−orbitronic technologies. Here, we propose a concept of a curvilinear antiferromagnetism where material responses can be tailored by a geometrical curvature without the need to adjust material parameters. We show that an intrinsically achiral one-dimensional (1D) curvilinear antiferromagnet behaves as a chiral helimagnet with geometrically tunable Dzyaloshinskii−Moriya interaction (DMI) and orientation of the Néel vector. The curvature-induced DMI results in the hybridization of spin wave modes and enables a geometrically driven local minimum of the low-frequency branch. This positions curvilinear 1D antiferromagnets as a novel platform for the realization of geometrically tunable chiral antiferromagnets for antiferromagnetic spin−orbitronics and fundamental discoveries in the formation of coherent magnon condensates in the momentum space.

Publication:

Oleksandr V. Pylypovskyi, Denys Y. Kononenko, Kostiantyn V. Yershov, Ulrich K. Rößler, Artem Tomilo, Jürgen Faßbender, Jeroen van den Brink, Denys Makarov, Denis D. Sheka. Curvilinear one-dimensional antiferromagnets, Nano Letters (2020) DOI: DOI: 10.1021/acs.nanolett.0c03246, arXiv: 2005.05835, Supplementary, PDF

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