The Bitter technique has revealed two kinds of planar domains in the Permalloy overlays associated with bubbles in Permalloy−coated garnet films. Measurements of dynamic properties of bubbles have shown that all the bubbles in these films have either zero or two Bloch lines. In addition, it has been clarified that the number of Bloch lines in the domain walls depends on the kind of planar domains through exchange interaction across the interface between garnet and Permalloy.