Wall velocity in garnet films at high drive fields

We measured velocities of an isolated straight domain wall at drive fields up to 100 Oe in the materials (YLa)3(FeGa)5O12and (YBi)3(FeGa)5O12. These measurements were performed at in-plane fields up to 200 Oe. When the drive field is increased up to 100 Oe we find that at non-zero in-plane fields the velocity rises from the constant saturation velocity at the lower drives to a higher value. The increase can be as much as a factor of five and velocities up to 300 m-s^-1are obtained. We investigated the wall motion by a well-known photometric method and by high-speed streak and framing mode photography. No significant disagreement was found between the results obtained by the two methods.