Abstract
The role of domain walls in bubble propagation layers is reviewed. Conventional permalloy overlay structures of typically 0.4–0.5 μm thickness show stray field free domain wall structures. These walls are very wide and mobile. It is concluded that wall pinning and irreversibilities are primarily connected with Bloch lines and other “singularities” which cannot be stray field free. In ion-implanted bubble memories domain walls play a more important role. Generally one expects symmetric Néel walls. By a partial stress relaxation “charged” walls are produced which are used for bubble transportation. The behaviour of these charged walls in connection with the details of the magnetoelastic interaction is investigated.
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