Inertia and Chiral Edge Modes of a Skyrmion Magnetic Bubble

Imam Makhfudz, Benjamin Krüger, and Oleg Tchernyshyov

Phys. Rev. Lett. 109, 217201 – Published 20 November 2012

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.

Received 21 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.217201

Authors & Affiliations

Imam Makhfudz¹, Benjamin Krüger², and Oleg Tchernyshyov¹

¹Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
²I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany