A magnetic bubble memory has a reading zone with thin detection elements, coated with {HEAD ~ an insulating layer} which carries {TAIL ~ thick bubble propagation patterns} of high magnetic permeability material, and a bubble stretching zone also including thick propagation patterns of shapes such that the rotating field of the device causes the bubbles to progress along the patterns 
A magnetic bubble memory has a reading zone with thin detection elements , coated with { HEAD ~ an insulating layer } which carries { TAIL ~ thick bubble propagation patterns } of high magnetic permeability material , and a bubble stretching zone also including thick propagation patterns of shapes such that the rotating field of the device causes the bubbles to progress along the patterns
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