This article deals with the investigation of noncollinear antiferromagnets, weak ferromagnets of the orthoferrite type. Investigations have shown that initially linear domain walls (DW) become non-one-dimensional at the moment when the supersonic barrier is overcome. The magnetic field intervals DELTAH_i (shelves) are observed on the V(H) dependence and the value of the DW velocity remains constant in the intervals. These phenomena can be interpreted as the result of self-organization. The flexural oscillations in moving DW are absent or negligible at velocities far from the parametrical resonance. The DW energies corresponding to the parametric resonance are separated by an energy gap. The DW overcomes this gap by tunneling. The transition among velocities is discrete and may be similar to the tunneling effect.
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