DTPL all-magnetic logic networks

The design and principles of operation of two-layer domain tip propagation logic (DTPL) set-reset and complementing flip-flops are described. These magnetic thin film devices demonstrate how the inherent delay in the propagation of channeled domain tips together with the basic DTPL logic elements (inhibit gates, fan-outs, crossovers, film-film transfers, and magnetic diodes) permit logic operations to be performed in a unique manner. Peculiar to the flip-flop devices is the fact that specific channels are continuously switched and reset by a fixed pulse sequence, although the overall network may be considered as existing in a given stable state. A ripple-carry binary counter constructed by interconnecting several similar complementing flip-flop (binary counter) stages and DTPL AND gates in a single two-layer structure is discussed.