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Ferrite Material

IP.com Disclosure Number: IPCOM000098068D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

The demands made upon ferrite cores, used in partial switching devices, are not as strict as for cores used in coincident-current selection arrangements. The core composition must provide sufficient output between two drive field values whose difference is less than the switching threshold field of the core. A feature of compositions, used for partial switching cores, is a very low coercive force. This necessitates only a very low drive current pulse during the switching operation, capable of being supplied by economical transistor circuitry.

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Ferrite Material

The demands made upon ferrite cores, used in partial switching devices, are not as strict as for cores used in coincident-current selection arrangements. The core composition must provide sufficient output between two drive field values whose difference is less than the switching threshold field of the core. A feature of compositions, used for partial switching cores, is a very low coercive force. This necessitates only a very low drive current pulse during the switching operation, capable of being supplied by economical transistor circuitry.

A core composition having these characteristics consists of

44 - 53 Mol% MnO

33 - 38 Mol%Fe(2)0(3)

10 - 13 Mol%ZnO

2 - 9 Mol% MO where M is a metallic oxide selected from Cr, Cu and Ni.

The drawing shows a typical flux output versus drive field curve for the composition. The output obtained by partial switching between points H(1) and H(2) is exceedingly high. H(2) minus H(1) corresponding to the bit drive current, is less than the switching threshold H(0) of the material.

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