G - Physics – 11 – C
Patent
G - Physics
11
C
352/37.2
G11C 11/14 (2006.01) G11C 19/08 (2006.01)
Patent
CA 1144277
CONTIGUOUS DISK BUBBLE STORAGE Abstract A bubble storage system using contiguous propagation elements is described using magnetically soft drive layers for movement of the bubble domains in a bubble domain film, in response to the reorientation of a magnetic drive field in the plane of the drive layers. In contrast with prior art contiguous element propa- gation structures, charged walls are not employed for movement of bubble domains. Instead, magnetic poles along the drive layers are used to move the domains. Two drive layers are used, each of which is comprised of a magnetically soft material, such as permalloy. The drive layers are located at different heights with respect to the layer in which the magnetic bubble domains exist, the bottom drive layer being comprised of contiguous propagation elements defining a generally undulating edge along which the magnetic bubble domains move. This layer can be comprised of permalloy con- tiguous disks, diamonds, etc. The top layer is comprised of magnetically soft elements located over the cusp regions formed along the undulating edges of the underlying drive layer. For propagation around the disks or diamonds, the bottom drive layer is predominant in determining bubble motion. However, in the area of YO979-020 the cusp regions along the undulating edge defined by the bottom drive layer, the magnetic poles produced by the top drive layer are predominant. These elements in the top drive layer produce potential wells at those locations corresponding to cusps along the undulating edge defined by the contiguous propagation elements in the bottom drive layer, and therefore control bubble motion in the cusp regions. This eliminates a serious problem to satisfactory bubble motion along contiguous propagation element devices. A single level masking fabrication process is described where the top and bottom drive layers can be fabricated through the same mask, and a total chip design is shown which provides all functions required in a complete storage chip. YO979-020
353816
Barrett B.p.
International Business Machines Corporation
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