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Uniform Bridge Coupled Films

IP.com Disclosure Number: IPCOM000093515D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Berkowitz, AE: AUTHOR

Abstract

Hard and soft films suitable for nondestructive readout NDRO coupled by magnetic bridges of definite configuration through an intermediate nonmagnetic layer can be made using photoresist techniques. Bridge coupled films so produced are not subject to the random variations of previous bridge coupled films, in which the bridges are produced by filling pin holes in a thin, nonmagnetic, metallic layer intermediate between the two magnetic films with magnetic material. Further, use of this technique allows the intermediate nonmagnetic layer to be thick enough to prevent wall coupling between the two magnetic layers. Such wall coupling produces low coercive force, giving poor disturb properties in previous devices.

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Uniform Bridge Coupled Films

Hard and soft films suitable for nondestructive readout NDRO coupled by magnetic bridges of definite configuration through an intermediate nonmagnetic layer can be made using photoresist techniques. Bridge coupled films so produced are not subject to the random variations of previous bridge coupled films, in which the bridges are produced by filling pin holes in a thin, nonmagnetic, metallic layer intermediate between the two magnetic films with magnetic material. Further, use of this technique allows the intermediate nonmagnetic layer to be thick enough to prevent wall coupling between the two magnetic layers. Such wall coupling produces low coercive force, giving poor disturb properties in previous devices.

The drawing shows a bridge coupled film device. It consists of uniaxial magnetic film 11 of thickness T1 deposited on a suitable substrate 12, strips 13 of nonmagnetic material of width D, thickness L, and separated by spacing W, magnetic material 14 of width W and depth L between strips 13, and a top layer of uniaxial magnetic film 15 of thickness T2.

Film 11 is hard and film 15 is soft. The anisotropy of film 11 is greater than that of film 15. Magnetic material 14 in the connecting bridges can be the same as that in film 11 or 15, or it can be a different composition depending on fabrication procedures. An example has the dimensions T1 of 1000 angstroms, T2 of 1000 angstroms, L of 7000 angstroms, D of 25 microns and W of 1 mic...