Replicator for cross-tie wall memory system incorporating isotro

Details Replicator for cross-tie wall memory system incorporating isotro Replicator for cross-tie wall memory system incorporating isotro

1977-01-03

1978-03-21

Moffitt, James W.

Static information storage and retrieval

Systems using particular element

Magnetic thin film

365 12, G11C 1908

Patent

active

040805913

ABSTRACT:
A plurality of data tracks, each formed of a strip of isotropic magnetic film, i.e., having substantially zero uniaxial anisotropy, are configured into a cross-tie wall memory system. Each of the data-track-defining-strips of isotropic magnetic film utilizes its shape, i.e., its edge contour induced anisotropy, rather than its easy axis magnetic field induced anisotropy, to constrain the cross-tie wall within the planar contour of the film strip. The use of the shape induced anisotropy of the isotropic strip of magnetic film permits the use of nonlinear, i.e., curved, data tracks. The curved data tracks are configured into major loop, minor loop cross-tie wall memory systems that were not permitted by the prior art magnetic field anisotropic magnetic film. The stray field from a cross-tie wall in a minor loop helps to nucleate Neel segments in a Neel wall in the major loop thus replicating data from the minor into the major loop.

REFERENCES:
AIP Conference on Magnetism & Magnetic Materials, Dec. 9-12, 1975; Phila. Pa., pp. 629-624.

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