Generation, gyroscopic dynamics and collisions of vertical Bloch lines in orthoferrites

Generation, dynamics and collisions of the solitary deflection waves (SDW) on the Neel-type domain wall (DW) of yttrium orthoferrite were investigated using two-fold high-speed photography. These waves had sharp fronts, long trailing edges and were retarded from the DW. Their shape remained constant throughout the observation. Their dynamic shape was similar to that of SDW accompanying the VBL in garnet films. A head-on collision of two SDWs of the same amplitude resulted in their complete annihilation. A similar collision of two SDWs having different amplitudes resulted in subtraction, of their amplitudes. The motion of SDW was caused by the gyroscopic force.