Browse Prior Art Database

Two Component Ferrite Keeper

IP.com Disclosure Number: IPCOM000090798D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

McIntosh, GA: AUTHOR [+2]

Abstract

A ferrite keeper having a formed-in-place ferrite layer and a high permeability sintered ferrite layer is used to increase the signal output from a magnetic film memory and to shield the memory from external magnetic fields. The memory includes one or more layers of nickel-iron film deposited on a suitable substrate. Orthogonally arranged word and bit-sense lines are for writing information into and reading it out of the nickel-iron film. The formed-in-place ferrite is fabricated on the bit-sense lines by applying to them a mixture of ground ferrite powder, such as NiZn ferrite, in a suitable liquid binder, e.g., a polyester binder. A process which allows some thickness control, such as silk screening, is used.

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Two Component Ferrite Keeper

A ferrite keeper having a formed-in-place ferrite layer and a high permeability sintered ferrite layer is used to increase the signal output from a magnetic film memory and to shield the memory from external magnetic fields. The memory includes one or more layers of nickel-iron film deposited on a suitable substrate. Orthogonally arranged word and bit-sense lines are for writing information into and reading it out of the nickel-iron film. The formed-in-place ferrite is fabricated on the bit-sense lines by applying to them a mixture of ground ferrite powder, such as NiZn ferrite, in a suitable liquid binder, e.g., a polyester binder. A process which allows some thickness control, such as silk screening, is used. The sintered ferrite keeper is then laminated to the formed-in-place ferrite by using pressure laminating techniques. The sintered ferrite is made by heat fusion of a quantity of ferrite powder, such as NiZn ferrite powder, so that a solid block is formed.

The block is then sliced into sheets of sintered ferrite material.

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