Browse Prior Art Database

Narrow Track Thin Film Recording Head

IP.com Disclosure Number: IPCOM000078869D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 53K

Publishing Venue

IBM

Related People

Klein, M: AUTHOR

Abstract

In Figs. 1A and 1B, there are depicted cross sections of single-turn integrated recording heads, Fig. 1A showing a "vertical" head and Fig. 1B showing a "horizontal" head. In Fig. 1A, the head is shown to consist of a magnetic film underlayer 10, a conductor layer 12 which may suitably be a copper conductor, and a magnetic film upper layer 14, the magnetic film underlayer resting on a suitable substrate 16. The structure designated by the numeral 18 represents the recording medium, which may suitably be a tape or other like structure. In the "horizontal" head shown in Fig. 1B, the structures therein corresponding to structures in the "vertical" head shown in Fig. 1A are designated with the same numerals, but include the prime notation. In the operation of the vertical head in Fig.

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Narrow Track Thin Film Recording Head

In Figs. 1A and 1B, there are depicted cross sections of single-turn integrated recording heads, Fig. 1A showing a "vertical" head and Fig. 1B showing a "horizontal" head. In Fig. 1A, the head is shown to consist of a magnetic film underlayer 10, a conductor layer 12 which may suitably be a copper conductor, and a magnetic film upper layer 14, the magnetic film underlayer resting on a suitable substrate 16. The structure designated by the numeral 18 represents the recording medium, which may suitably be a tape or other like structure. In the "horizontal" head shown in Fig. 1B, the structures therein corresponding to structures in the "vertical" head shown in Fig. 1A are designated with the same numerals, but include the prime notation. In the operation of the vertical head in Fig. 1A, the cross section of the magnetic flux path is limited by the thickness of the magnetic film in one dimension, and by the track width on the recording medium in the other dimension (into the paper in Fig. 1A).

Heretofore, recording tracks have been relatively wide, typically at least several tens of mils, and thus, this width limitation of the flux path has not been seriously disadvantageous. However, for high-density tape recording systems which may have on the order of thousands of tracks per inch, the desired track width is less than one mil whereby, of necessity, the cross section of one or both legs of the magnetic path becomes very small.

The horizontal head shown in Fig. 1B has the same limitation as to cross section of its magnetic flux path, as does the vertical head of Fig. 1A.

There is described herein a thin-film head structure which enables the use of a narrow track, without the limiting of the cross section of the magnetic path (as illustrated in the heads shown in Figs. 1A and 1B). In this head as shown in Fig. 2, the substrate 20 may either be a metal or an insulator such as a ceramic plate upon which metal has been deposited, substrate 20 serving as the bottom conductor with the metal layer thereon being the bottom leg of a single-turn winding on the head. Over this substrate 20, there is deposited an insulating layer 22 which may suitably be sputtered alumina. On layer 22 there is deposited a layer 24 of permalloy, such layer suitably being deposited by electroplating over a conductive flash layer, or by evaporation.

The permalloy layer 24 i...