Browse Prior Art Database

Suppression of Hard Bubbles by a Thin Permalloy Layer

IP.com Disclosure Number: IPCOM000079987D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Giess, EA: AUTHOR [+4]

Abstract

A simple technique for suppressing hard bubble domains in a bubble domain material is provided through the use of a thin permalloy layer, which is exchange coupled to the bubble domain material. This type of coupling serves to eliminate Neel lines in the domain wall, thereby suppressing the hard bubbles. Consequently, the additional magnetic layer (permalloy) establishes a new domain wall between the bubble domain in the permalloy, thereby eliminating the Neel lines.

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Suppression of Hard Bubbles by a Thin Permalloy Layer

A simple technique for suppressing hard bubble domains in a bubble domain material is provided through the use of a thin permalloy layer, which is exchange coupled to the bubble domain material. This type of coupling serves to eliminate Neel lines in the domain wall, thereby suppressing the hard bubbles. Consequently, the additional magnetic layer (permalloy) establishes a new domain wall between the bubble domain in the permalloy, thereby eliminating the Neel lines.

The drawing shows a permalloy layer of approximately 200 angstroms exchange coupled to a magnetic bubble domain material. The magnetization M(p) of the permalloy is in the plane of the permalloy, while the magnetization M(s) of the bubble domain material is directed normal to the plane of the bubble domain material. The permalloy can be selectively located on regions on the bubble domain material, such as information channels along which the bubble domains pass.

The device has advantages in that the fabrication of additional soft magnetic layers of material, such as permalloy, is easily provided on any bubble domain material.

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