Spin eigenmodes of magnetic skyrmions and the problem of the effective skyrmion mass

The properties of magnon modes localized on a ferromagnetic skyrmion are studied. Mode eigenfrequencies display three types of asymptotic behavior for large skyrmion radius. A number of properties of the magnon eigenfunctions are determined. This enables us to demonstrate that the skyrmion dynamics for a traveling-wave ansatz obeys the massless Thiele equation.

Phys. Rev. B 97 (2018), 064403, PDF

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