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.
Magnetic frustration, the competition among exchange interactions, often leads to novel magnetic ground states with unique physical properties which can hinge on details of interactions that are otherwise difficult to observe. Such states are particularly interesting when it is possible to tune the balance among the interactions to access multiple types of magnetic order. We present antlerite Cu 3 SO 4 (OH) 4 as a potential platform for tuning frustration. Contrary to previous reports, the low-temperature magnetic state of its three-leg zigzag ladders is a quasi-one-dimensional analog of the magnetic state recently proposed to exhibit spinon-magnon mixing in botallackite. Density functional theory calculations indicate that antlerite's magnetic ground state is exquisitely sensitive to fine details of the atomic positions, with each chain independently on the cusp of a phase transition, indicating an excellent potential for tunability.
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