Scattering of high-energy magnons off a magnetic skyrmion

Abstract

We discuss the scattering of high-energy magnons off a single magnetic skyrmion within the field-polarized ground state of a two-dimensional chiral magnet. For wavevectors larger than the inverse skyrmion radius, $k{r}_s\gg 1$, the magnon scattering is dominated by an emerging magnetic field whose flux density is essentially determined by the topological charge density of the skyrmion texture. This leads to skew and rainbow scattering characterized by an asymmetric and oscillating differential cross section. We demonstrate that the transversal momentum transfer to the skyrmion is universal due to the quantization of the total emerging flux while the longitudinal momentum transfer is negligible in the high-energy limit. This results in a magnon-driven skyrmion motion approximately antiparallel to the incoming magnon current and a universal relation between current and skyrmion-velocity.

10 pages, 9 figures; (v2) published version

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Cited by in corpus (12)

• Magnetic bilayer-skyrmions without skyrmion Hall effect
• Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets
• Spin eigen-excitations of the magnetic skyrmion and problem of the effective mass
• Thermal stability of metastable magnetic skyrmions: Entropic narrowing and significance of internal eigenmodes
• Stability of skyrmion lattices and symmetries of quasi-two-dimensional chiral magnets
• Edge instabilities and skyrmion creation in magnetic layers
• Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces
• Topological magnon band structure of emergent Landau levels in a skyrmion lattice
• Spin eigen-excitations of an antiferromagnetic skyrmion
• Magnon dynamics in a Skyrmion-textured domain wall of antiferromagnets
• Spin Wave Driven Skyrmions in a Bipartite Antiferromagnetic Lattice
• Strong Coupling between Propagating Magnons and High-order Gyrotropic Skyrmion Modes