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Structure for Providing Perpendicular Magnetic Fields During Deposition of Thin Films

IP.com Disclosure Number: IPCOM000080583D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Klokholm, E: AUTHOR [+2]

Abstract

This structure is useful for providing perpendicular magnetic fields across growing magnetic films, such as amorphous magnetic films useful as magnetic bubble domain materials. Use of this structure ensures that a maximum anisotropy K(u) will occur for a given magnetic film composition and for given deposition conditions.

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Structure for Providing Perpendicular Magnetic Fields During Deposition of Thin Films

This structure is useful for providing perpendicular magnetic fields across growing magnetic films, such as amorphous magnetic films useful as magnetic bubble domain materials. Use of this structure ensures that a maximum anisotropy K(u) will occur for a given magnetic film composition and for given deposition conditions.

Cylindrical permanent magnets having a magnetic moment of about 500 gauss (typically) are located in a ferrite plate having low coercivity and low- magnetic moment. The height of a permanent magnet is generally about twice its diameter and the magnets are fitted snugly into holes in the ferrite plate. They are generally separated by a distance of approximately three times the permanent magnet diameters.

The substrates onto which magnetic films are to be deposited are located over the permanent magnets. The diameter of a substrate is conveniently slightly less than the diameter of the permanent magnet. The ferrite plate limits the magnetic field of the permanent magnets to the vicinity of the magnets, so that the stray fields of the various magnets will not interact. During the deposition of amorphous magnetic materials, such as Gd-Co films, the occurrence of a sufficient anisotropy K(u) is insured by this technique for providing perpendicular magnetic fields.

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