Magnetic particles and strings in iron langasite

Abstract

Particle-like topological magnetic defects that can propagate in all spatial directions open a new dimension for design of magnetic memory and data processing devices. We show that three-dimensional magnetic skyrmions can be stabilized in non-collinear antiferromagnets, such as the Fe-langasite, Ba${}_3$TaFe${}_3$Si${}_2$O${}_{14}$. Spins in the crystallographic unit cell of this material form a 120-degree ordering transformed by competing exchange interactions into a short-period spiral, which in turn forms a basis for complex large-scale magnetic superstructures stabilized by Dzyaloshinskii-Moriya interactions and applied magnetic fields. We derive an effective continuum model describing modulated states of Fe-langasite at the 100 nm scale and explore its magnetic phases and topological defects. The order parameter space of this model is similar to that of superfluid ${}^3$He-A and the three-dimensional topological defect is closely related to the Shankar monopole and hedgehog soliton in the Skyrme model of baryons.

References in corpus (9)

• Electrical Manipulation of a Topological Antiferromagnetic State
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Non-collinear Antiferromagnets and the Anomalous Hall Effect
• Nanometric square skyrmion lattice in a centrosymmetric tetragonal magnet
• Direct imaging of a zero-field target skyrmion and its polarity switch in a chiral magnetic nanodisk
• Fractional antiferromagnetic skyrmion lattice induced by anisotropic couplings
• Skyrmion knots in frustrated magnets
• Single domain magnetic helicity and triangular chirality in structurally enantiopure Ba3NbFe3Si2O14
• Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$

Cited by in corpus (1)

• Stability of Hopfions in Bulk Magnets with Competing Exchange Interactions