Curvilinear One-Dimensional Antiferromagnets

• Published in: Nano letters Vol. 20; no. 11; pp. 8157 - 8162
• Main Authors: Pylypovskyi, Oleksandr V, Kononenko, Denys Y, Yershov, Kostiantyn V, Rößler, Ulrich K, Tomilo, Artem V, Fassbender, Jürgen, van den Brink, Jeroen, Makarov, Denys, Sheka, Denis D
• Format: Journal Article
• Language: English
• Published: American Chemical Society 11-11-2020
• Subjects: curvilinear spin chain; coherent magnon excitations; Dzyaloshinskii−Moriya interaction; antiferromagnetism; spin−orbitronics
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.0c03246

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.