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Ferrite Head Design and Fabrication

IP.com Disclosure Number: IPCOM000061850D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Mahanna, JR: AUTHOR [+3]

Abstract

The illustrated technique is directed to a combination of etching, material deposition and machining designed to circumvent the problems associated with the narrow track widths of ferrite heads. An etch process is used to define the track, where tight dimensional control and a well-defined edge are required. After etching two small rectangular pockets, the area between which becomes the track, a layer of hard, non-magnetic material is deposited to encapsulate the track for protection. A lapping operation then removes the excess non-magnetic material and the remaining mask, eliminating the need for a chemical strip. A combination of machining operations is then used to define the balance of the air bearing geometry, which has much less stringent dimensional requirements. The grinding wheel never touches the edge of the track.

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Ferrite Head Design and Fabrication

The illustrated technique is directed to a combination of etching, material deposition and machining designed to circumvent the problems associated with the narrow track widths of ferrite heads. An etch process is used to define the track, where tight dimensional control and a well-defined edge are required. After etching two small rectangular pockets, the area between which becomes the track, a layer of hard, non-magnetic material is deposited to encapsulate the track for protection. A lapping operation then removes the excess non-magnetic material and the remaining mask, eliminating the need for a chemical strip. A combination of machining operations is then used to define the balance of the air bearing geometry, which has much less stringent dimensional requirements. The grinding wheel never touches the edge of the track. The process, as progressively shown in the figure, begins with a ferrite head row 3. A head row is an elongated rectangular block which will eventually yield a multiplicity of individual heads. The block surface 4 is lapped to slightly over the finished head thickness to allow for later lapping to the final thickness. Cores are not yet ground into the part. After cleaning, a thin conductive layer is applied to the air bearing surface (ABS) 4. This provides a good uniform base for the subsequent plating operations. The metalized part is then coated with resist, exposed, developed and plated with the metal ma...