Browse Prior Art Database

Fat L Bubble Switch

IP.com Disclosure Number: IPCOM000052464D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Cohen, MS: AUTHOR [+2]

Abstract

The "fat L" switch is a bubble switch whose design is compatible with " bar" ("half-disk") propagation elements, and is easily implemented by the "single-level-masking"(SLM) fabrication. This switch can be used for both the write switch to introduce data from a major path into the minor loops of a major-minor loop configuration, and for the read switch for taking data out of minor loops and into a major path for subsequent feed into a sensor. In addition, the switch, which may be operated in the drive-to-transfer mode, is particularly applicable for use with the three-quadrant drive field cycle which permits operation at low switch currents, and hence is suitable for use with small bubbles.

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Fat L Bubble Switch

The "fat L" switch is a bubble switch whose design is compatible with " bar" ("half-disk") propagation elements, and is easily implemented by the "single- level-masking"(SLM) fabrication. This switch can be used for both the write switch to introduce data from a major path into the minor loops of a major-minor loop configuration, and for the read switch for taking data out of minor loops and into a major path for subsequent feed into a sensor. In addition, the switch, which may be operated in the drive-to-transfer mode, is particularly applicable for use with the three-quadrant drive field cycle which permits operation at low switch currents, and hence is suitable for use with small bubbles.

A fat L switch 10 is shown having an L=shape and a star-shaped pattern 12 which intersects the stem 14 of the fat J, Pattern 12 includes magnetic bars 16 and 18, and a conductor 20 which crosses stem 14. Elements 22 and 24 are part of a minor loop for movement of bubbles along the path indicated by arrow
26. For clockwise field (H) rotation, in the absence of switching current, the bubble follows path G-H-A-B-F and stays in the minor loop. If, however, at phase 1 or shortly before, a current pulse of sufficient magnitude is applied on conductor 20 and is left on for a period of about a quarter cycle, the bubble will alternatively travel the path A-C-D-E and hence out of the minor loop. At phases later than 1, poles B and C are in competition for the bubble which must...