magnetic bubble memory

…single-crystal ferrites in which tiny magnetic domains called bubbles can be individually manipulated. A number of ferrites absorb microwave energy in only one direction or orientation; for this reason, they are used in microwave wave guides.

…has been developed based on magnetic garnet ferrites. In bubble memory small, cylindrically reversed magnetic domains can be generated, moved, and stored in specified locations to be read at a later time. The presence or absence of a bubble corresponds to the two binary logic states.

The magnetic bubble memory is more economical to operate than mechanical tape, disk, or drum units and is considerably more compact. The device consists of a chip of synthetic garnet about the size of a matchbook. It stores data in tiny cylindrically shaped magnetic domains called…

…research programs aimed at developing bubble memory devices for large computers. As bubble memories were proved to be technically feasible (i.e., work reliably under normal operating conditions), attention shifted to developing processes to manufacture the memory units at competitive costs. This part of the job proved the most difficult, and…