The Utilization of Domain Wall Viscosity in Data-Handling Devices

The investigation of the switching behavior of metal tape rectangular loop cores in the millimicrosecond region has led to the discovery of a group of phenomena associated with elastic switching. These effects can be explained in terms of the existing theory of magnetic domains and appear to be associated with the elasticity and viscosity of motion of the domain walls involved in the magnetization process. Various digital circuit applications are described. These include a technique of continuously displaying the contents of magnetic shift registers and means of operating random access memories an order of magnitude faster than present current coincidence types without an increase in the amount of equipment required, and without the use of extra windings or of a special core geometry.