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Browse Prior Art Database

Switching Magnetic Recording Head

IP.com Disclosure Number: IPCOM000095216D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR

Abstract

Read-write head 2 for recording magnetically stored information comprises a split core 4 made of non-linear magnetic material having a square-loop characteristic. Core 4 has air gap l g. This is located above the record, assumed to be a magnetic recording medium. The magnetic field from the tape, representing binary information, switches the magnetic state of a sufficiently small core 2.

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Switching Magnetic Recording Head

Read-write head 2 for recording magnetically stored information comprises a split core 4 made of non-linear magnetic material having a square-loop characteristic. Core 4 has air gap l g. This is located above the record, assumed to be a magnetic recording medium. The magnetic field from the tape, representing binary information, switches the magnetic state of a sufficiently small core 2.

The maximum length l of core 4 for it to be switchable by the field from the recording medium is related to the gap width l g by the relationship l = (H(t)/H(c)) l g. H(t) is the magnetic field emanating from the recording medium and H(c) is the coercive force of the non-linear core 4. If Ht is 100 oersteds, H(c) is 1 oersted and l g is -- 100 microinches, then l = ( 100/1) 100 microinches or about 10 mils. Such small cores can be made. Voltages induced in winding 6 are sensed by suitable detecting devices not shown.

Such core is capable of attaining high signal-to-noise ratio.

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