Fig. 3. Magnetic field dependence of the DW ellipticity.
a DW displacement plotted against temperature for various in-plane dc magnetic field applied to the sample. b The changes in DW displacement induced by dc field values of and show sharp peaks at and , indicating a phase transition into the linear wall state, c DW displacement versus for different values of in-plane dc fields at . A clear change in the DW displacement and mobility is observed by tuning the wall ellipticity with an in-planed field applied to the sample near . d DW displacement plotted versus in-plane field for various temperatures. A saturation behavior is observed at lower temperatures toward the Bloch wall phase.