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Generating Hollow Magnetic Bubble Domains

IP.com Disclosure Number: IPCOM000079424D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Almasi, GS: AUTHOR [+3]

Abstract

A magnetic medium 10 of orthoferrite, garnet, or other suitable material is shown as having a magnetization normal to the surface and in a downward direction, as indicated by arrows 12. Normal or conventional magnetic bubble domains 14 are shown as lying within the magnetic medium 10, and their magnetization is reversed with respect to the surrounding area as indicated by upwardly directed arrows 16.

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Generating Hollow Magnetic Bubble Domains

A magnetic medium 10 of orthoferrite, garnet, or other suitable material is shown as having a magnetization normal to the surface and in a downward direction, as indicated by arrows 12. Normal or conventional magnetic bubble domains 14 are shown as lying within the magnetic medium 10, and their magnetization is reversed with respect to the surrounding area as indicated by upwardly directed arrows 16.

Overlying material 10 and adjacent with the upper surface thereof is a current conducting loop or coil 18. The coil may be in the form of a single, open turn as shown by the solid lines, or may comprise a plurality of closed turns as shown schematically by broken lines 20.

It has been found that if normal bubbles such as 14 exist in the medium 10 within the area defined by the coil 18, and a current pulse of sufficient amplitude is applied across coil terminals 22, 24, to cause current flow in the direction shown by arrow 26, such bubbles 28 switch or reverse their magnetization to the direction indicated by arrows 30. At the same time, domain 32 of the medium surrounding the bubbles 28 and within the coil also reverses its direction of magnetization, as indicated by arrows 34. Domain wall 36 between area 32 and the remainder of medium 10 generally assumes a somewhat wavy configuration, as shown. Area 32 and switched bubbles 28 within it constitute a hollow bubble.

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