Browse Prior Art Database

Magnetic Domain Wall Information Storage

IP.com Disclosure Number: IPCOM000074120D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Henry, GR: AUTHOR

Abstract

Naturally occurring internal degrees of freedom of cylindrical magnetic domains can be used for information storage. This is an alternative to domain-no-domain magnetic memories. A cylindrical magnetic domain possesses an internal degree of freedom which is represented by the direction of circulation of the magnetization in the domain wall. This magnetization direction (handedness) is used to store information, at one-bit per domain.

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Magnetic Domain Wall Information Storage

Naturally occurring internal degrees of freedom of cylindrical magnetic domains can be used for information storage. This is an alternative to domain-no- domain magnetic memories. A cylindrical magnetic domain possesses an internal degree of freedom which is represented by the direction of circulation of the magnetization in the domain wall. This magnetization direction (handedness) is used to store information, at one-bit per domain.

Two domains are shown, one of which has a counter-clockwise direction of magnetization in the domain wall, while the other has a clockwise direction of magnetization in the domain wall. These domains exist in a magnetic sheet such as orthoferrite and can be propagated to various locations within the sheet by known techniques. Readout of a stored domain is accomplished by forcing the stored domain into a high speed collision with a "reference domain" of known handedness. The domain wall inertia drives the domains into intimate contact and, if they have the same handedness, they will rebound. If they have opposite handedness, they will coalesce. The existence of one or two domains is an indication whether the storage domain was similar or dissimilar to the reference domain.

Storage of information is accomplished by splitting a reference domain of appropriate handedness. One of the split domains is stored while the other becomes the new reference domain. The two split domains will have the same ...