Magnetic domain splitter

Claim 1

A magnetic weighting circuit comprising, a. a plate shaped magnetic material, having upper and lower parallel surfaces, capable of retaining magnetic bubbles when a sufficient magnetic field is applied in the easy axis direction of said magnetic plate, b. means for applying a biasing magnetic field in the easy axis direction of said plate, c. a plurality of thin film magnetic elements arranged on said upper and lower surfaces of said plate, d. means for generating a rotating magnetic field in the plane of said plate which magnetizes said thin film elements to retain a magnetic bubble at plate positions adjacent a magnetic pole of said thin film elements, the said retaining pole on each said thin film element rotating with the rotation of said planar magnetic field, e. at least some of said thin film elements being arranged in positions such that when the planar magnetic field rotates from a first direction to a second direction said retaining pole moves from a first location to at least two second locations equally spaced from said first location, whereby a magnetic bubble retained at said first location when said magnetic field is in said first direction will split and move to said second locations when said magnetic field rotates to said second direction, said arrangement comprising: i. first and second thin film elements on said upper and lower surfaces, respectively, having shapes and being positioned with respect to one another to provide retaining poles substantially adjacent one another, but not overlapping, when said planar magnetic field is in said first direction, whereby a single magnetic bubble will be held and effectively stretched between both said retaining poles when said planar magnetic field is in said first direction, and ii. third and fourth thin film elements on said upper and lower surfaces, respectively, having shapes and being positioned to provide two retaining poles, respectively, when said planar magnetic field is in a second direction substantially perpendicular to said first direction, said last mentioned two retaining poles being equidistant from the position of a bubble held by said first two retaining poles and being far enough apart to cause a bubble previously held by said first two retaining poles to split with one moving to each of the two last mentioned retaining poles when said planar magnetic field rotates from said first direction to said second direction.