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Gapless Bubble Propagation Structure

IP.com Disclosure Number: IPCOM000087199D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Cohen, MS: AUTHOR

Abstract

A gapless propagation structure is used to move magnetic bubble domains in magnetic medium 1, in response to the reorientations of the magnetic field H in the plane of medium 1. Propagation structure 2 can be comprised of magnetically soft elements, such as NiFe. Structure 2 is comprised of alternating semi-disks 3 and bars 4. The feature of this structure which limits the lithography is the width of the bars 4, thus permitting roughly twice the density of a conventional gapped structure such as a T-I bar structure or a Y-I bar structure.

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Gapless Bubble Propagation Structure

A gapless propagation structure is used to move magnetic bubble domains in magnetic medium 1, in response to the reorientations of the magnetic field H in the plane of medium 1. Propagation structure 2 can be comprised of magnetically soft elements, such as NiFe. Structure 2 is comprised of alternating semi-disks 3 and bars 4. The feature of this structure which limits the lithography is the width of the bars 4, thus permitting roughly twice the density of a conventional gapped structure such as a T-I bar structure or a Y-I bar structure.

In response to the reorientation of field H, which could be a rotating magnetic field, bubble domains move along the semi-disks 3 and bars 4.

A loop structure is shown including a 180 degrees corner 5. The periodicity of the structure is such that bubble-bubble interactions are minimized. Thus, about four bubble diameters are between each bit position. Bars 4 have small protruding tips 4A which serve to concentrate the pole strength where it is needed. To provide a total system, transfer gates, generators and detectors can have conventional designs.

The semicircular outer boundaries of the disk 3 can be modified without adversely affecting bubble propagation. For instance, these outer boundaries can be linear boundaries, such as triangles or truncated triangles. Such a change may offer advantages in lithography.

The cusp regions between the bars 4 and the outer boundaries of the disks 3 are n...