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Magnetic Materials for Cylindrical Magnetic Domains

IP.com Disclosure Number: IPCOM000076253D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Romankiw, LT: AUTHOR

Abstract

The magnetic properties of materials suitable for cylindrical domain devices can be locally tailored to create usable devices without the need for magnetic or conductor overlays. Diffusion, and ion implantation followed by diffusion, is used to locally change the magnetic properties. In this fashion, domain generators, propagators, channels, amplifiers, collapsers, and reducers can be formed. The properties of the entire magnetic sheet in which the domains exist can be changed by exposing one side or both sides of the sheet to an impurity (such as a rare earth element in the case of an orthoferrite magnetic sheet). Also, local magnetic properties can be altered by exposing the magnetic sheet to diffusion of desired impurities through a mask or by implanting the impurities by ion implantation.

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Magnetic Materials for Cylindrical Magnetic Domains

The magnetic properties of materials suitable for cylindrical domain devices can be locally tailored to create usable devices without the need for magnetic or conductor overlays. Diffusion, and ion implantation followed by diffusion, is used to locally change the magnetic properties. In this fashion, domain generators, propagators, channels, amplifiers, collapsers, and reducers can be formed. The properties of the entire magnetic sheet in which the domains exist can be changed by exposing one side or both sides of the sheet to an impurity (such as a rare earth element in the case of an orthoferrite magnetic sheet). Also, local magnetic properties can be altered by exposing the magnetic sheet to diffusion of desired impurities through a mask or by implanting the impurities by ion implantation. It may be desirable to initially alter the properties of the entire sheet and then locally alter the properties.

Devices formed in this way can also be used with conventional permalloy or copper overlays.

Localized impurities can be used to create areas in which domains form very readily, in order to create bubble generators. Further, impurity strips or other continuous curved or straight channels can be used as bubble domain channels. Properly doped areas having an impurity which causes the domain to increase in size can be used as amplifiers. Areas which are doped with impurities that make the area only weakly magnetic or...