Magnetic head damage evaluation method and apparatus therefor

Details Magnetic head damage evaluation method and apparatus therefor Magnetic head damage evaluation method and apparatus therefor

1997-03-28

1998-08-18

Powell, William

Etching a substrate: processes

Forming or treating article containing magnetically...

156345, 216 84, 216 85, B44C 122

Patent

active

057954909

ABSTRACT:
Nitric acid is used to etch the air-bearing-surface (alumina titanium carbide) of a slider, the air-bearing-surface overcoat and adhesive layer formed thereon being worn out, sa as to reduce the optical reflectance of the region where the air-bearing-surface substrate is exposed. The air-bearing-surface of the slider is optically imaged and the resulting image processed by a computer to determine the surface area of the region where both the adhesive layer and the air-bearing-surface overcoat are worn out, having reduced optical reflectance. Then, the adhesive layer is removed by means of hydrofluoric acid treatment and etching is again done with nitric acid to create another region with a reduced optical reflectance, enabling determination of the surface area of the region over which only the air-bearing-surface overcoat is worn out.

REFERENCES:
patent: 5329689 (1994-07-01), Azuma et al.
patent: 5566075 (1996-10-01), Syouji et al.
patent: 5624581 (1997-04-01), Ihrke et al.

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