Transfer and replication arrangement for magnetic bubble memory

Details Transfer and replication arrangement for magnetic bubble memory Transfer and replication arrangement for magnetic bubble memory

1979-09-10

1982-02-16

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Generators

365 15, 365 23, G11C 1908

Patent

active

043162630

ABSTRACT:
A magnetic bubble replication and transfer arrangement is disclosed which provides for replicating magnetic bubbles in thin planar layers of magnetic material without the need for electrical current carrying conductor elements. The arrangement includes a replicating half-disc permalloy element disposed in a particular way between first and second tracks formed from half-disc elements which are deposited on a surface of the magnetic layer. When a rotating magnetic field in the plane of the material is rotated in a predetermined direction with respect to the above arrangement, replication of a bubble in the first track occurs at a replication region where a portion of the replicating element is adjacent the first track. The original bubble continues movement within the first track while the newly formed bubble moves along the replicating element into the second track in response to rotation of the in-plane magnetic field.
Transfer of bubbles from the second track to the first track and transfer without replication from the first track to the second track is provided for by applying timed electrical signals to a transfer electrical conductor which is interlinkably disposed between the magnetic layer and elements of the second track and a portion of the replicating element adjacent the first track. The timed electrical signals are applied for specific portions of the rotation cycle of the in-plane field to effect bubble transfer between first and second tracks.

REFERENCES:
Proceedings of the IEEE-vol. 63, No. 8; Aug. 1975, pp. 1176-1195.
IEEE Transactions on Magnetics-vol. Mag. 12, No. 6; Nov. 1976, pp. 614-617.
"Passive Replicator for Magnetic Bubbles" by T. J. Nelson of Bell Laboratories, Murray Hill, N.J. 07974.
IBM Technical Disclosure Bulletin-vol. 19, No. 7; Dec. 1976, pp. 2744-2745.

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