Critical domain wall velocity in orthoferrites

Abstract

In the plates of orthoferrites, cut perpendicularly to the optical axis, a two-domain system in magnetic field gradient was obtained. The velocity of strictly straight single domain wall driven by a pulse field was investigated by means of the Faraday rotation. The velocity in YFeO 3 grows and reaches saturation value of 2 × 10 6 cm/s. This is the critical domain wall velocity and its value is equal to the minimum spin wave velocity.