Bubble switch and circuit utilizing YY overlay

A new type of magnetic bubble circuit called YY overlay permits a fabrication of relatively higher density and is useful for the design of a logic element because of its simple configuration. A bias modulation switch, crossover, and some simple logic elements using the YY overlay have been investigated. The switch is simpler to fabricate and operate than a conductor switch or a switch by reversing a rotating field. A 364 bit repertory dialer memory was designed and tested. Sufficient operating margins of propagation, generation, and switching have been obtained.