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arXiv · 1803.04001

Skyrmions Driven by Intrinsic Magnons

Christina Psaroudaki·Daniel Loss
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Abstract

We study the dynamics of a skyrmion in a magnetic insulating nanowire in the presence of time-dependent oscillating magnetic field gradients. These ac fields act as a net driving force on the skyrmion via its own intrinsic magnetic excitations. In a microscopic quantum field theory approach we include the unavoidable coupling of the external field to the magnons, which gives rise to time-dependent dissipation for the skyrmion. We demonstrate that the magnetic ac field induces a super-Ohmic to Ohmic crossover behavior for the skyrmion dissipation kernels with time-dependent Ohmic terms. The ac driving of the magnon bath at resonance results in a unidirectional helical propagation of the skyrmion in addition to the otherwise periodic bounded motion.

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Christina Psaroudaki, Daniel Loss. 2018-03-11. Skyrmions Driven by Intrinsic Magnons. https://doi.org/10.1103/physrevlett.120.237203

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