Computer: Contiguous-element memories increase storage tenfold: An overlapping-triangle configuration for bubble memories may displace permalloy-chevron types

A new generation of contiguous-element magnetic-bubble devices can store about 10 times more information than permalloy chevron magnetic-bubble devices and yet be made by standard photolithographic technology. Devices in development have a storage density of 4 million bits per square centimeter. Chevron bubble memories presently offer only about 1 Mb/cm2, and a density of about 1.5 Mb/cm2 may be achieved, but this would strain the capabilities of photolithographic technology. However, a density of 16 Mb/em2 appears within reach with current processing methods for contiguous-disk devices.