Physics – Condensed Matter – Materials Science
Scientific paper
2008-04-15
Appl. Phys. Lett. 93, 052503 (2008)
Physics
Condensed Matter
Materials Science
16 pages, 3 figures
Scientific paper
10.1063/1.2968138
It is known that oscillatory domain-wall (DW) motions in soft magnetic thin-film nanostripes above the Walker critical field lead to a remarkable reduction in the average DW velocities. In a much-higher-field region beyond the velocity-breakdown regime, however, the DW velocities have been found to increase in response to a further increase of the applied field. We report on the physical origin and detailed mechanism of this unexpected behavior. We associate the mechanism with the serial dynamic processes of the nucleation of vortex-antivortex (V-AV) pairs inside the stripe or at its edges, the non-linear gyrotropic motions of Vs and AVs, and their annihilation process. The present results imply that a two-dimensional soliton model is required for adequate interpretation of DW motions in the linear- and oscillatory-DW-motion regimes as well as in the beyond-velocity-breakdown regime.
Choi Youn-Seok
Guslienko Konstantin Yu.
Kim Sang-Koog
Lee Jun-Young
Lee Ki-Suk
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