Current controlled disk replicator

In a single high resolution level masking magnetic bubble domain chip including a magnetic medium in which bubble domains can be generated and moved, and including two non-coplanar levels of metallurgy defined by a single high resolution level of masking, the first of which is a layer of magnetic material having in-plane magnetization which is patterned to provide propagation elements along which bubble domains move in response to a magnetic field which reorients in the plane of said medium and the second of which is a layer of non-magnetic electrically conductive material which is patterned to provide current carrying conductors including transfer conductors for moving bubble domains from one shift register to another in said chip, said second layer being located between said bubble domain magnetic medium and said magnetic first layer, said first and second layers being patterned with a single level of masking, the improvement comprising:

• a replicate-type bubble domain generator including a seed domain holding means including a portion of said first layer of magnetic material for holding a seed domain thereon as said magnetic field reorients through continuous cycles,
• a current carrying path intersecting said seed domain holding means, said current path including a first portion thereof remote from said seed domain holding means comprised of said non-magnetic electrically conductive layer and said magnetic material layer and a second portion thereof which is said seed domain holding means, the primary path for electrical current in said first portion being through said non-magnetic electrically conductive layer and in said second portion being through said seed domain holding means, wherein said seed domain is stretched as said magnetic field reorients, a current pulse in said current carrying path producing a localized magnetic field which aids in splitting said seed domain when it is stretched.