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

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• Magnon dynamics in a Skyrmion-textured domain wall of antiferromagnets
• Controllable magnon frequency comb in synthetic ferrimagnets
• Chiral magnetic skyrmions across length scales
• 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
• Texture-induced spin-orbit coupling and Skyrmion-electron bound states in a Néel antiferromagnet
• Antiferro skyrmion crystal phases in a synthetic bilayer antiferromagnet under an in-plane magnetic field
• Moving skyrmions in Antiferromagnets by Sublattice Displacements
• Interaction and collision of skyrmions in chiral antiferromagnets
• Electron states, bound to a texture in a Néel antiferromagnet
• Dynamic Fingerprints of Synthetic Antiferromagnet Nanostructures with Interfacial Dzyaloshinskii-Moriya Interaction