Ferrite Head Design and Fabrication
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
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.