Back-to-Back Bubble Memory Detector System
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Magnetoresistive sensors are used to detect bubbles in magnetic domain chips. The sensors are associated with a magnetic bubble expander-detector circuit, which consists of a specific geometric pattern, e.g., chevrons, of magnetic material, that is positioned over the bubble-supporting material or layer of the chip. In certain systems, to mitigate the effects of noise, a pair of sensors are connected in a noise-cancellation bridge configuration. One sensor, referred to as the active sensor, does the actual detection of the bubble, and the other functions as a dummy sensor to effect the cancellation. Ideally, the two sensors are in close proximity and reside within the same or equivalent magnetic environment.