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Apparatus to Increase Magnetic Field During Thin Film Head Processing to Maintain Saturation and Film Anisotropy

IP.com Disclosure Number: IPCOM000037913D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-30
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Romankiw, LT: AUTHOR

Abstract

The present apparatus increases the magnetic field and thus overcomes magnetic curling near the edges of yoke during thin film head processing in which the track density has been increased to about 2000 and the pole tips have been decreased to about 6mm. The Figure shows the apparatus of the present invention which serves as a flux concentrator. The flux concentrator 2 is placed within a permanent magnet 4. The flux concentrator 2 has a nonmagnetic nonconducting frame 6 made of a material such as lucite. Soft magnetic iron inserts 8, perpendicular to the flux field 10 created by the permanent magnets 4, are inserted in the frame 6. The thin films 12 are positioned between soft iron concentrators 14 and stainless steel deflectors 16.

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Apparatus to Increase Magnetic Field During Thin Film Head Processing to Maintain Saturation and Film Anisotropy

The present apparatus increases the magnetic field and thus overcomes magnetic curling near the edges of yoke during thin film head processing in which the track density has been increased to about 2000 and the pole tips have been decreased to about 6mm. The Figure shows the apparatus of the present invention which serves as a flux concentrator. The flux concentrator 2 is placed within a permanent magnet 4. The flux concentrator 2 has a nonmagnetic nonconducting frame 6 made of a material such as lucite. Soft magnetic iron inserts 8, perpendicular to the flux field 10 created by the permanent magnets 4, are inserted in the frame 6. The thin films 12 are positioned between soft iron concentrators 14 and stainless steel deflectors 16. If the apparatus of the present invention is to be used in a corrosive environment, such as a plating tank, the soft iron can be plated with a corrosion resistant material such as nickel or gold.

Using the present method the number of rows of thin films 12 which can be processed can be increased to about 4. When multiple rows of thin films 12 are processed a soft magnetic iron insert 8 is positioned between each row.

The apparatus of the present invention can be used during thin film head processing which may include plating, evaporation, sputtering, film stabilization and annealing.

Disclosed anonymously.

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