Browse Prior Art Database

High Density Head

IP.com Disclosure Number: IPCOM000083491D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Kehr, WD: AUTHOR [+2]

Abstract

The magnetic gap of a high-density magnetic read/write head is formed by overlapping thin-film layers.

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High Density Head

The magnetic gap of a high-density magnetic read/write head is formed by overlapping thin-film layers.

The unit is built up on an insulating substrate such as a ceramic, glass or an oxidized silicon wafer. If a metal is used, an additional layer of insulation is required between the lower copper conductor and the substrate.

The structure consists of eight layers, each defined by a photoresist process. The metallic layers can be either deposited in a vacuum or plated by electrolytic or electroless processes. The hole may be filled by an electroless process or alternatives.

The magnetic circuit consists of two superimposed films, separated at the writing surface by the gap material. Slots cut in each film from the edge of the conductor, ensure that the magnetic flux generated by current in the conductor crosses the gap material to produce an external recording field. The slots perform a similar function during reading, guiding the tape flux around the conductor.

The details of the fabrication process are as follows: Step(s) 1 Plate substrate with copper. 2-8 Use photoresist operations to define the low conductor. This sequence consists of coating with photoresist, drying, exposing through the appropriate mask, developing, baking, etching and stripping. 9 Vacuum deposit SiO insulating layer. 10 Plate with Ni-Fe alloy. 11-17 Use photoresist to define the lower element of the magnetic circuit, including the slot. 18 Deposit the gap material. 19-25 Us...