Abstract
The dynamics of a magnetic vortex in a thin magnetically soft ferromagnetic disc with a submicron diameter has been analyzed. Under the action of field pulses with a duration of the order of 10–100 ps, the vortex undergoes a complex motion. The analysis of the results of a micromagnetic simulation indicates that this motion is non-Newtonian. It can be described by an equation containing the third time derivative of the displacement of the vortex core.
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If only the low-frequency gyrotropic mode is excited in the system, the coordinate X of the vortex core is proportional to the average magnetization of the system 〈M〉: 〈M〉 = 2πM s RL[e z, X]/3 [26]. The detailed analysis of the trajectories of the vortex core shows that such a relation is also valid for the excitation of the high-frequency modes.
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Original Russian Text © B.A. Ivanov, G.G. Avanesyan, A.V. Khvalkovskiy, N.E. Kulagin, C.E. Zaspel, K.A. Zvezdin, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 91, No. 4, pp. 190–195.
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Ivanov, B.A., Avanesyan, G.G., Khvalkovskiy, A.V. et al. Non-Newtonian dynamics of the fast motion of a magnetic vortex. Jetp Lett. 91, 178–182 (2010). https://doi.org/10.1134/S0021364010040041
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DOI: https://doi.org/10.1134/S0021364010040041