Coincident-Current Nondestructive Readout from Thin Magnetic Films

Abstract

By using cores which consist of two‐vacuum‐deposited ferromagnetic films it is possible to build memory arrays from which data can be read out nondestructively by use of coincident‐current selection. It is thus possible to eliminate the external selection matrices commonly associated with nondestructive readout memories. This system promises to be inexpensive, reliable, and fast, especially in a memory in which read operations occur more frequently than write operations. Three different devices are described which fulfill the criterion of coincident‐current nondestructive readout. Good signal to noise has been achieved with each of these.