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- W4308243940 abstract "Chiral magnets can host topological particles known as skyrmions, which carry an exactly quantised topological charge $Q=-1$. In the presence of an oscillating magnetic field ${bf B}_1(t)$, a single skyrmion embedded in a ferromagnetic background will start to move with constant velocity ${bf v}_{text{trans}}$. The mechanism behind this motion is similar to the one used by a jellyfish when it swims through water. We show that the skyrmion's motion is a universal phenomenon, arising in any magnetic system with translational modes. By projecting the equation of motion onto the skyrmion's translational modes and going to quadratic order in ${bf B}_1(t)$, we obtain an analytical expression for ${bf v}_{text{trans}}$ as a function of the system's linear response. The linear response and consequently ${bf v}_{text{trans}}$ are influenced by the skyrmion's internal modes and scattering states, as well as by the ferromagnetic background's Kittel mode. The direction and speed of ${bf v}_{text{trans}}$ can be controlled by changing the polarisation, frequency and phase of the driving field ${bf B}_1(t)$. For systems with small Gilbert damping parameter $alpha$, we identify two distinct physical mechanisms used by the skyrmion to move. At low driving frequencies, the skyrmion's motion is driven by friction, and $v_{text{trans}}simalpha$, whereas at higher frequencies above the ferromagnetic gap, the skyrmion moves by magnon emission, and $v_{text{trans}}$ becomes independent of $alpha$." @default.
- W4308243940 created "2022-11-09" @default.
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- W4308243940 date "2022-11-03" @default.
- W4308243940 modified "2023-09-24" @default.
- W4308243940 title "Skyrmion Jellyfish in Driven Chiral Magnets" @default.
- W4308243940 doi "https://doi.org/10.48550/arxiv.2211.01714" @default.
- W4308243940 hasPublicationYear "2022" @default.
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