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.

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 logic gate. The data-track-defining-strip 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 an isotropic strip of magnetic film permits the use of nonlinear, i.e., curved, data tracks. Two input and one output data tracks are configured into an AND/OR logic gate to permit the cross-tie wall memory system to perform both memory and logic functions.

Abstract: A method of and an apparatus for improving the selective positioning of single wall domains or bubbles in a memory system is disclosed. The method includes the use of slotted intersecting digit and word lines that are coated with a magnetic material of relatively high retentivity.