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Interleaved Multielement Magnetic Head

IP.com Disclosure Number: IPCOM000078213D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Kington, BW: AUTHOR

Abstract

Complete separation of the individual transducing elements of a thin film vertical multielement magnetic head limits the track density that can be achieved by such a head, because the overall width of the elements is considerably greater than the width of their magnetic polepieces.

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Interleaved Multielement Magnetic Head

Complete separation of the individual transducing elements of a thin film vertical multielement magnetic head limits the track density that can be achieved by such a head, because the overall width of the elements is considerably greater than the width of their magnetic polepieces.

Fig. 1 shows a single turn version of a multielement head in which a first array of elements 10 has, superimposed on it, a second array of elements 20. The conductors 21 of the second array overlap and are interleaved with the conductors 11 of the first array. The spacing of the magnetic polepieces 12 and 22 of the elements of the respective arrays is closer than could be achieved with a single array.

The head of Fig. 1 is made by the deposition of successive layers of material in the order illustrated in Fig. 2. The magnetic polepieces are formed by permalloy layers P1, P2, and P3, and the electrical conductors by copper layers C1 and C2. The P2 deposition forms portions of both arrays, thus reducing the number of manufacturing steps by one. In practice, insulating layers I would be included as indicated by the dashed lines in Fig. 2. Smoothing layers for smoothing the surface between depositions have also been omitted for simplicity. The relative vertical position of the various layers in Fig. 2 may not be as shown, depending on the degree of smoothing required.

In an alternative form of this head, the P2 deposition could take the form of a cont...