Spin eigen-excitations of an antiferromagnetic skyrmion

Abstract

We theoretically predict and classify the localized modes of a skyrmion in a collinear uniaxial antiferromagnet and discuss how they can be excited. As a central result, we find two branches of skyrmion eigenmodes with distinct physical properties characterized by being low or high energy excitations. The frequency dependence of the low-energy modes scales as $R_0^{-2}$ for skyrmions with large radius $R_0$. Furthermore, we predict localized high-energy eigenmodes, which have no direct ferromagnetic counterpart. Except for the breathing mode, we find that all localized antiferromagnet skyrmion modes, both in the low and high-energy branch, are doubly degenerated in the absence of a magnetic field and split otherwise. We explain our numerical results for the low-energy modes within a string model representing the skyrmion boundary.

13 pages, 9 figures

References in corpus (7)

• Two-Dimensional Matter: Order, Curvature and Defects
• Magnon-skyrmion scattering in chiral magnets
• Inertia and chiral edge modes of a skyrmion magnetic bubble
• Antiferromagnetic skyrmion crystals: generation, topological Hall and topological spin Hall effect
• Amplitudes for magnon scattering by vortices in two-dimensional weakly easy-plane ferromagnets
• Dynamics of topological solitons in two-dimensional ferromagnets
• Study of the Effect of Annealing on the Properties of Mn2RuxGa Thin Films

Cited by in corpus (4)

• Coupled skyrmion breathing modes in synthetic ferri- and antiferromagnets
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion
• Boundary conditions for the Néel order parameter in a chiral antiferromagnetic slab