Nondestructive sensing of magnetic cores

MAGNETIC CORES with rectangular hysteresis loops are of interest to the field of digital computers because of their ability to hold, or “remember,” the direction in which they are magnetized. In digital computer terminology, a magnetic core may be said to contain a binary 0 if its remanent flux is positive or a binary 1 if its remanent flux is negative. A group of magnetic cores therefore can hold a pattern of 0's and 1's which make up a binary number.