Magnetic bubble memory device

摘要

A magnetic bubble memory device comprises a magnetic bubble propagation track formed by ion implantation. A region enclosed by the propagation track and lightly or shallowly implanted with ions on a condition differing from that for forming the propagation track or not implanted with ions at all is provided with a island-like isolated region heavily or deeply implanted with ions on the same condition as that for forming the propagation track.