Planar magnetic bubble device

In a magnetic device comprising a monocrystalline substrate, a magnetic film formed on said substrate, said magnetic film being adapted to form and hold magnetic bubbles, an insulating film, a control conductor pattern layer including a hair pin shaped loop which passes current for controlling the magnetic bubbles, and a propagation path pattern layer including magnetic bubble propagation path segments, said layers being laminated on the surface of said magnetic film through said insulating film, the improvement which comprises a spacer conductor pattern layer interposed between said propagation path segments and said magnetic film, said spacer conductor pattern layer being formed on the same plane as said control conductor pattern layer for maintaining substantially constant the distance between said propagation path segments and said magnetic film and which further comprises an insulating layer formed along the contour of said conductor pattern layer for electrically insulating the same from said spacer pattern layer.