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Throat Height Control Head Manufacture

IP.com Disclosure Number: IPCOM000083603D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Berger, LL: AUTHOR [+2]

Abstract

The lapping of magnetic head elements to precisely determine the throat height of the thin-film heads can be controlled by depositing a separate lapping control conductor or resistance layer, while forming the separate layers of the head. The IBM Technical Disclosure Bulletin entitled "Alignment of Read-Write Heads in Sliders", by P.F.J. Landler, Vol. 11, No. 12, May 1969, pp. 1792 and 1793, is an example of the use of a separate deposited layer used during the lapping process to control the material removed.

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Throat Height Control Head Manufacture

The lapping of magnetic head elements to precisely determine the throat height of the thin-film heads can be controlled by depositing a separate lapping control conductor or resistance layer, while forming the separate layers of the head. The IBM Technical Disclosure Bulletin entitled "Alignment of Read-Write Heads in Sliders", by P.F.J. Landler, Vol. 11, No. 12, May 1969, pp. 1792 and 1793, is an example of the use of a separate deposited layer used during the lapping process to control the material removed.

The disadvantage of the former methods is that the lapping control layer was deposited at the same time as the conductors for the head element, or the permalloy forming the first magnetic layer. The insulating gap material was deposited next with the second magnetic material following. The gap material placement determines the throat height. Thus, the alignment error during processing between the thin-film layers could affect the final throat height.

The throat height of thin-film heads is held to a tighter tolerance, by depositing the lapping control element with the same layer alignment as that layer which determines the throat height. Thus, in a single-turn head such as that described in the IBM Technical Disclosure Bulletin, "Thin-Layer Magnetic Head", Vol. 16, No. 10, March 1974, p. 3278, the lapping control conductor can be deposited during the registration when the gap conductive layer is deposited.

In an inducti...