Mutually exclusive magnetic bubble propagation circuits

A closed loop magnetic bubble propagation circuit, comprising a sheet of magnetic bubble material, means for applying a magnetic bias field orthogonal to said sheet to produce and maintain magnetic bubbles therein, a continuous ferromagnetic overlay circuit operatively disposed on said sheet forming a closed bubble propagation path, and means for applying a predetermined sequence of pulsed discrete drive field orientations in the plane of said sheet for propagating bubbles around said closed path.

A closed loop magnetic bubble propagation circuit, comprising a sheet of magnetic bubble material, means for applying a magnetic bias field orthogonal to said sheet to produce and maintain magnetic bubbles therein, a ferromagnetic overlay circuit operatively disposed on said sheet forming a closed bubble propagation path, means for applying a predetermined sequence of pulsed discrete drive field orientations in the plane of said sheet for propagating bubbles around said closed path, said closed path having a plurality of sides, said sequence of pulsed drive fields containing a plurality of different subsequences for propagating bubbles along corresponding ones of said sides.

A closed loop continuous magnetic bubble propagation circuit, comprising a sheet of magnetic bubble material, means for applying a bias field orthogonal to said sheet to produce and maintain bubbles therein, and a magnetic bubble propagation overlay circuit on said sheet in the form of a continuous zigzag pattern crisscrossing the sides of a reference triangle such that the zigzag elements of said pattern on any given side of said crisscrossed triangle are parallel to the other two sides of said reference triangle, and means for applying a predetermined sequence of pulsed magnetic drive fields in the plane of said sheet in first, second and third directions respectively parallel to the sides of said reference triangle for propagating bubbles around said closed path.

A magnetic bubble propagation system comprising a sheet of magnetic bubble material, means for applying a magnetic bias field orthogonal to said sheet to produce and maintain bubbles therein, control means for applying pulsed drive fields in the plane of said sheet in a first sequence of first directions and in a second sequence of second directions each of which is different from and nonparallel to said first directions, two field-accessed magnetic bubble propagation paths formed by ferromagnetic circuit element overlays exclusively responsive respectively to said first and second sequences for propagating bubbles at different times.

Field-accessed mutually exclusive closed bubble propagation paths, comprising means defining a first many-sided closed bubble propagation path in which the sides of said path are parallel to corresponding sides of a first equilateral reference triangle having a first orientation, means for applying a sequence of three pulsed drive fields aligned respectively with the sides of said first equilateral triangle for propagating bubbles around said first closed path, each side of said first closed path being formed by a circuit pattern overlay for propagating bubbles along said side in response to alternating alignment of said first sequence of drive fields with the other two sides of said first reference triangle, a second many-sided closed bubble propagation path the sides of which are parallel to corresponding sides of a second equilateral reference triangle having a second orientation such that the sides of said second triangle are nonparallel to the sides of said first triangle, means for applying a second sequence of three pulsed drive fields aligned respectively with the sides of said second triangle, each side of said second closed path being formed by a circuit pattern overlay for propagating bubbles along said side in response to alternating alignment of said second sequence of pulsed drive fields with the other two sides of said second triangle.