Abstract: The design of a magnetic film strip for defining the data track of a cross-tie wall memory system is disclosed. The design involves the conformation or shaping of the opposing edges of the film strip into repetitive, rounded, asymmetrical serrated edge contours. The serrated edge shape structures the cross-tie of each cross-tie, Bloch-line pair at the narrowest width dimension across the film strip while the Bloch-line is positioned at the widest width dimension across the film strip or at the round, convex, portion of the repetitive serrated edge shape. The asymmetrical, rounded edge contour is substantially in alignment with the natural contour of the magnetization that is oriented around a Bloch-line that is positioned on the cross-tie wall, which cross-tie wall is aligned along and superposed the geometric centerline of the film strip.

Abstract: An apparatus for and a method of recording or writing optical data into a thermoplastic layer is disclosed. The apparatus includes a layer of photoconductive material that is photoconductively responsive to a data containing light beam having a wave length below the infrared (IR) range and a layer of thermoplastic material that is thermoplastically responsive to a light beam having a wave length within the IR range. In practicing the method of the present invention, the electrically charged apparatus is exposed to a data-bearing light beam having a wave length below the IR range for selectively exposing, i.e., electrically charging, the photoconductive layer.