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We study field-driven magnetic domain wall dynamics in garnet strips bylarge-scale three-dimensional micromagnetic simulations. The domain wallpropagation velocity as a function of the applied field exhibits a low-fieldlinear part terminated by a sudden velocity drop at a threshold fieldmagnitude, related to the onset of excitations of internal degrees of freedomof the domain wall magnetization. By considering a wide range of stripthicknesses from 30 nm to 1.89 $\mu$m, we find a non-monotonic thicknessdependence of the threshold field for the onset of this instability, proceedingvia nucleation and propagation of Bloch lines within the domain wall. Weidentify a critical strip thickness above which the velocity drop is due tonucleation of horizontal Bloch lines, while for thinner strips and depending onthe boundary conditions employed, either generation of vertical Bloch lines, orclose-to-uniform precession of the domain wall internal magnetization takesplace. For strips of intermediate thicknesses, the vertical Bloch lines assumea deformed structure due to demagnetizing fields at the strip surfaces,breaking the symmetry between the top and bottom faces of the strip, andresulting in circulating Bloch line dynamics along the perimeter of the domainwall.

Bloch line dynamics within moving domain walls in 3D ferromagnets