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Process for Contiguous Bubble Devices

IP.com Disclosure Number: IPCOM000052289D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Keefe, GE: AUTHOR [+2]

Abstract

Typically, several masking levels are required in order to produce bubble devices using contiguous propagation elements. In the present process, the gold mask used as part of the ion implantation mask also functions as a conductor to carry current. This means that a separate, critically aligned mask is not required for fabrication of the transfer conductor. A complete bubble storage system is shown in the drawing. The conductor 10 used to define the ion implantation patterns is also the transfer conductor used to transfer bubble domains between the major loop and the various minor loops. The spacing between the major and minor loops is selected such that a common charged wall can be established across the spacing between the major and the minor loops. This common charged wall tends to elongate the bubble across the spacing.

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Process for Contiguous Bubble Devices

Typically, several masking levels are required in order to produce bubble devices using contiguous propagation elements. In the present process, the gold mask used as part of the ion implantation mask also functions as a conductor to carry current. This means that a separate, critically aligned mask is not required for fabrication of the transfer conductor. A complete bubble storage system is shown in the drawing. The conductor 10 used to define the ion implantation patterns is also the transfer conductor used to transfer bubble domains between the major loop and the various minor loops. The spacing between the major and minor loops is selected such that a common charged wall can be established across the spacing between the major and the minor loops. This common charged wall tends to elongate the bubble across the spacing. Transfer-in and transfer-out operations are achieved simply by energizing the current-carrying conductor overlying the major loop with an appropriate polarity to push and pull the bubble, respectively. In operation, unipolar current pulses can be used. For transfer from the minor to the major loop, a unipolar current pulse is on less or is turned on earlier, while for transfer from the major to the minor loop, the current pulse is on a longer amount of time.

The nucleator conductor 12 and the sensor/stretcher conductor 14 are also deposited at the same time as conductor 10. The permalloy pattern in the sen...