Wall States in Ion‐Implanted Garnet Films

A model is presented which explains the wall states, and transitions between states, observed for bubbles propagating under the influence of an in‐plane field in ion‐implanted garnet films. We have identified nine transitions in which the deflection angle changes, six of which are accounted for by switching of the capping layer and injection of a Bloch point (BP). It was necessary to invoke three different wall structures for $\mathrm{S}\text{=+1}$ bubbles depending upon the relative orientation of bubble velocity and the in‐plane field. Two different $\mathrm{S}\text{=1/2}$ bubbles containing one BP are identified which differ in location of the Bloch point and the associated capping structure. There is one state containing two vertical Bloch lines and two BP's, one on each line; and there is a single $\mathrm{S}\text{=0}$ state.