Gradientless propulsion of magnetic bubble domains

We find that some types of magnetic bubbles can be propelled by homogeneous fields: a modulated bias field superimposed on a steady in-plane field. Characteristic velocity vectors are observed which can discriminate among wall configurations having a common winding number s. Two particular complementary bubbles having s = 1 move in opposite directions nearly orthogonal to the in-plane field because the translational coercive force couples to motions of the wall radius and two Bloch lines. © 1976.