Abstract
Domain wall (DW) dynamics in a low-damping YBiFeGa film with perpendicular magnetic anisotropy was studied under FMR conditions. Measurements were carried out under radial expansion of magnetic bubbles in high pulsed drive fields and in an in-plane de magnetic field. A high-speed image recording technique was employed. The pattern of the dependence of DW velocity on drive field for the parts of the DW oriented parallel and perpendicular to the in-plane field was established. In all cases, this dependence contains a saturation region in which the DW velocity increases noticeably with increasing in-plane field. The experimental data obtained do not agree with theory. A possible explanation for this discrepancy is proposed. The onset of spatially periodic distortions in a moving DW is discussed.
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