Electrical lapping guide for controlling the batch fabrication o

Details Electrical lapping guide for controlling the batch fabrication o Electrical lapping guide for controlling the batch fabrication o

1986-07-15

1987-06-30

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Electrical device making

29602R, 29592R, 29705, 29707, G11B 5127, H01F 706

Patent

active

046759867

ABSTRACT:
Method and apparatus for controlling the throat height of batch fabricated thin film magnetic transducers. During deposition of the transducer elements on a substrate, a resistive electrical lapping guide is deposited on at least one end of the array of transducer elements. The electrical lapping guide includes a plurality of switching junctions formed between a section of electrically resistive material and conductors. At least one switching junction is deposited on the substrate having a known switching plane position. During lapping of the transducer pole tip ends to a final height, the switching junction will change state to provide an accurate indication of the lapped throat height. The throat height, as determined from measured resistance of the lapping guide, is compared to the switching junction position at the time said switching junction changes state. Subsequent resistance measurements are calibrated in light of this comparison.

REFERENCES:
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patent: 4190872 (1980-02-01), Jones et al.
patent: 4295173 (1981-10-01), Romankiw et al.
IBM Tech. Discl. Bull., vol. 18, No. 11, Apr. 1976, pp. 3782-3783, "Element Height Determination for Thin Film Transducers".
IBM Tech. Discl. Bull., vol. 23, No. 4, Sep. 1980, p. 1631, "Lapping Magnetic Head Elements".
IBM Tech. Discl. Bull., vol. 23, No. 2, Jul. 1980, p. 776, "Electrical Lapping Guide".
IBM Tech. Disc. Bull., vol. 11, No. 12, May 1969, p. 1792, "Alignment of Read-Write Heads in Sliders".
IBM Tech. Discl. Bull., vol. 23, No. 6, Nov. 1980, p. 2550, "Lapping Guides for Magnetic Heads".

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