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Browse Prior Art Database

Providing a Hard Axis Bias by Using a Ferromagnetic Material on a Thin Film Memory Device

IP.com Disclosure Number: IPCOM000092601D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Zeller, H: AUTHOR

Abstract

The technique is for applying a hard axis bias field on a magnetic film from a storage cell.

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Providing a Hard Axis Bias by Using a Ferromagnetic Material on a Thin Film Memory Device

The technique is for applying a hard axis bias field on a magnetic film from a storage cell.

The cell includes metallic substrate 2 over which is deposited chromium layer 4, the function of which is to furnish an adhesive bond for the subsequent layers that are deposited. Over layer 4 is deposited silicon monoxide layer 6 which supplies a smooth plane for the reception of the subsequently deposited magnetic film 8. Laminated word lines 10 are superimposed over film 8 in the direction of the easy axis of such film. Over lines 10 are placed laminated common bit-sense lines 12 positioned orthogonal to the easy axis of film 8. Keeper 14 completes the storage cell and is the device for maintaining the hard axis bias on film 8.

To produce this bias field, keeper 14 is made from ferromagnetic particles. The latter have a preferred unidirectional anisotropic axis which is mixed with a suitable binder. While in a fluid state, this slurry, that is the mixture of ferromagnetic particles and binder, is applied over lines 12. Simultaneously with such application, a DC current is applied along lines 10. The polarity of that current is the same as that used for reading and writing of intelligence. This induces the ferromagnetic particles to orient themselves so that their easy axis lies parallel to the field produced by the word current. When the slurry is hardened, the line 10 current is...