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Inertia and chiral edge modes of a Skyrmion magnetic bubble
Imam Makhfudz1, Benjamin Krüger, Oleg Tchernyshyov
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Abstract:
The dynamics of a vortex in a thin-film ferromagnet resembles the motion of a charged massless particle in a uniform magnetic field. Similar dynamics is expected for other magnetic textures with a nonzero Skyrmion number. However, recent numerical simulations reveal that Skyrmion magnetic bubbles show significant deviations from this model. We show that a Skyrmion bubble possesses inertia and derive its mass from the standard theory of a thin-film ferromagnet. In addition to center-of-mass motion, other low energy modes are waves on the edge of the bubble traveling with different speeds in opposite directions.
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