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Bubble Domain Storage using Unichiral Bubbles

IP.com Disclosure Number: IPCOM000088983D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Argyle, BE: AUTHOR [+2]

Abstract

Unichiral bubbles, termed + or - X bubbles in accordance with their chirality, are stable bubbles to use in an information storage system, since they are resistive to Bloch point nucleation. However, detection of these + or - X bubbles requires that they be converted into bubbles having two vertical Bloch lines, termed + or - 0 bubbles. If the area in which the conversion takes place is ion-implanted, the + or - X bubbles can only be converted into one Sigma state bubble, rather than two Sigma state bubbles. In order to overcome this, it is proposed to use ion implantation only in the generator region where Sigma bubbles are generated. The Sigma bubbles are then converted into + or - X bubbles for storage, and are then reconverted into + or - 0 bubbles for detection.

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Bubble Domain Storage using Unichiral Bubbles

Unichiral bubbles, termed + or - X bubbles in accordance with their chirality, are stable bubbles to use in an information storage system, since they are resistive to Bloch point nucleation. However, detection of these + or - X bubbles requires that they be converted into bubbles having two vertical Bloch lines, termed + or - 0 bubbles. If the area in which the conversion takes place is ion- implanted, the + or - X bubbles can only be converted into one Sigma state bubble, rather than two Sigma state bubbles. In order to overcome this, it is proposed to use ion implantation only in the generator region where Sigma bubbles are generated. The Sigma bubbles are then converted into + or - X bubbles for storage, and are then reconverted into + or - 0 bubbles for detection.

In the figure, a magnetic bubble domain film 10 has an ion-implanted region 12 in a particular portion of the film. The entire structure has different functional portions. For example, a generator is used to produce Sigma bubbles having S = 1 winding numbers. These o bubbles are then automoted by application of appropriate magnetic fields to a converter region where they are transformed into + or - X bubble domains. Conversion occurs by the application of selected magnetic fields to cause the vertical Bloch lines in a o bubble domain to meet and annihilate one another, leaving a right-handed or left-handed unichiral domain.

The + or -X bubbles are then s...