Browse Prior Art Database

Bubble Domain Associative Memory

IP.com Disclosure Number: IPCOM000078203D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Ahn, KY: AUTHOR [+2]

Abstract

Two magnetic sheets are used for this memory: one provides information storage and the other provides interrogation. Electrical writing of information and optical readout are used, although other readout techniques are possible.

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Bubble Domain Associative Memory

Two magnetic sheets are used for this memory: one provides information storage and the other provides interrogation. Electrical writing of information and optical readout are used, although other readout techniques are possible.

Fig. 1 shows the overall system, in which an interrogation plate and a storage plate 2 are separated by a bit line 3 connected to a bit drive 4. The bit line and its driver, together with a word line 5 and its driver 6, are used to write information into plate 2 by coincident excitation. Magneto-optic readout is achieved using the combination of light source 7, light deflector 8, an analyzer 9, and a detector 10 responsive to the light transmitted through the combination of the interrogation plate and the storage plate.

Fig. 2 is a cross-sectional view of interrogation plate 1 and storage plate 2, together with the bit lines and word lines. Interrogation is accomplished by matching the polarity of the magnetization states in storage plate 2 and interrogation plate 1, by the magneto-optic Faraday effect. The nucleation field of plate 2 is larger than that of plate 1 so nondestructive content interrogation is feasible. To perform a content search, the content is first written into plate 2, after which source 7 is pulsed and a "match/mismatch" is detected by detector 10. In Fig. 2, bit n in plate 1 has a polarity matching the content of bit A in plate 2, thus no net Faraday signal is present at detector 10. I...