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Magnetic Bubble Nucleation With Controlled Chirality

IP.com Disclosure Number: IPCOM000083779D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Brown, BR: AUTHOR [+2]

Abstract

It is well known that information can be stored in the wall structure of a bubble domain, and that in particular, the chirality of a simple, continuous Bloch wall can be used for binary coding . A class of devices capable of producing or nucleating bubbles with controlled chirality is described below.

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Magnetic Bubble Nucleation With Controlled Chirality

It is well known that information can be stored in the wall structure of a bubble domain, and that in particular, the chirality of a simple, continuous Bloch wall can be used for binary coding . A class of devices capable of producing or nucleating bubbles with controlled chirality is described below.

The figure illustrates the type of structure of these devices. An electrically conductive magnetic film such as an amorphous film is positioned on an appropriate electrically conductive substrate, such as copper or a similar good electrical conductor. An insulation layer separates a classic "hairpin" nucleation loop from the magnetic film. A separate electrode, an azimuthal field conductor, makes electrical contact with the magnetic layer in the region near the center of the hairpin conductor.

The bubble is nucleated in the usual way by an electrical current pulse through the hairpin conductor. During the nucleation pulse, a current is sent by the azimuthal field electrode through the magnetic film to the conductive substrate, or to an electrode under the film, not shown. The current density in the magnetic film produces an azimuthal magnetic field, which greatly favors one chirality over the other.

The sign of the chirality reflects the sign of the electrical current in the magnetic film. For example, the chirality is clockwise (as viewed from above) when the current flows from the azimuthal field conductor to th...