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Static Tester for Thin Film Magnetic Heads

IP.com Disclosure Number: IPCOM000080127D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Jones, AS: AUTHOR [+2]

Abstract

A thin film magnetic head 1 has multiple electromagnetic thin film transducing elements 2 deposited on one vertical face of an air bearing slider 3. In its working environment, such a slider may be intended to fly very close to the surface of a disk record medium. It is a relatively cumbersome procedure to test the functioning of the transducing elements 2 after manufacture, by actually flying the head.

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Static Tester for Thin Film Magnetic Heads

A thin film magnetic head 1 has multiple electromagnetic thin film transducing elements 2 deposited on one vertical face of an air bearing slider 3. In its working environment, such a slider may be intended to fly very close to the surface of a disk record medium.

It is a relatively cumbersome procedure to test the functioning of the transducing elements 2 after manufacture, by actually flying the head.

The static tester shown has an optical flat 4 on which is deposited a copper strip line 5. The head 1 is located on top of the flat by block 6, resting on deposited spacer 7, so that transducing elements 2 register with strip line 5. The slider 3 is transparent, so that the separation between the heads and the line can be measured by interferometric methods.

The transducing elements are tested under static conditions by passing an alternating current through strip line 5, so as to produce a magnetic field which simulates the effect of recorded magnetic data on a flying head. Behavior at various flying heights can be simulated, by depositing insulating films of appropriate thickness over the strip line 5. The recording field produced by the elements could be investigated by a variant of the tester shown, in which the strip line 5 was made of a magnetoresistive material.

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