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Horizontal Thin Film Head with Symmetrical Windings

IP.com Disclosure Number: IPCOM000078037D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 82K

Publishing Venue

IBM

Related People

Watrous, RB: AUTHOR

Abstract

This thin film horizontal magnetic head includes a multiturn, symmetrical coil winding. As shown in the drawing, eight conductor turns 10 pass between permalloy magnetic layers 11 and 12 which form the magnetic yoke. The path length and thus the resistance of the symmetrical coils is less than a concentrically wound coil.

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Horizontal Thin Film Head with Symmetrical Windings

This thin film horizontal magnetic head includes a multiturn, symmetrical coil winding. As shown in the drawing, eight conductor turns 10 pass between permalloy magnetic layers 11 and 12 which form the magnetic yoke. The path length and thus the resistance of the symmetrical coils is less than a concentrically wound coil.

The first permalloy layer 11 is plated over the air bearing surface material 15 so as to form read/write gap 17. Gap 17 is filled with insulation material 18. The conductor turns 10 are deposited on the insulation material 18. A second insulation layer 23 is deposited over the conductors and the second permalloy layer 12 deposited thereover.

Fig. 1 shows a plan view of the head with center tap conductor pads 19 and 20 being connected by an insulated conductor, not shown, which passes over the coil windings. Fig. 2 is a section through lines 2-2 of Fig. 1. The terminals of the respective coils are 21 and 22. Since the two four-turn coils are symmetrical with respect to the center line of the head, write performance will be the same when either coil is energized.

Alternatively, the coils could be arranged in a two-layered structure. By depositing continuous films of magnetic and conductive layers over the structure, the magnetic head can be magnetically shielded.

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