Spin valve read head with plasma produced metal oxide insulation

Details Spin valve read head with plasma produced metal oxide insulation Spin valve read head with plasma produced metal oxide insulation

1997-12-11

1999-12-07

Ometz, David L.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

059993790

ABSTRACT:
A method is provided for providing extra insulation between lead layers and first and second shield layers of a read head so as to prevent electrical shorting therebetween. A sensor layer is partially formed with a capping layer of a first oxidizable metallic layer. A lead layer is formed with a second oxidizable metallic capping layer thereon. A rear edge of the partially completed sensor is then formed followed by formation of an insulation layer which seals the rear edge. The wafer, upon which the components are constructed, is then subjected to an oxygen-based plasma which oxidizes the oxidizable layers with the second oxidizable metallic layers oxidizing at a faster rate than the first oxidizable metallic layer. The second oxidized layer then provides the desired extra insulation between the lead layers and the second shield layer. The read head produced by the method includes a sensor layer and first and second lead layers. A first metal oxide layer is on the sensor layer and a sensor layer and a second metal oxide layer is on each of the first and second lead layers. The sensor layer, the first and second lead layers and the first and second metal oxide layers are located between first and second gap layers and the first and second gap layers are located between first and second shield layers.

REFERENCES:
patent: 5302461 (1994-04-01), Anthony
patent: 5337203 (1994-08-01), Kitada et al.
patent: 5475551 (1995-12-01), Honda et al.
patent: 5555147 (1996-09-01), Maruyama
patent: 5617277 (1997-04-01), Chen et al.
patent: 5809636 (1998-09-01), Shouji et al.

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