Western Digital (Fremont), Inc.

Laddawan Supadee

Krisda Siangchaew

Chupong Pakpum

Worawarit Kobsiriphat

A method and apparatus for testing workpiece overcoats is described.

Testing workpiece overcoat

A method for fabricating an air-bearing surface (ABS) in a substrate having a surface is described. The substrate is for a magnetic recording head. The method includes providing a mask on the surface of substrate. The mask has an edge adjacent to a portion of the substrate exposed by the mask. The method also includes forming a taper in the portion of the substrate adjacent to the edge. The taper has an angle from the surface of the substrate of at least thirty degrees and not more than seventy degrees. The method also includes performing a reactive ion etching (RIE) to remove the portion of the substrate to form a cavity in the substrate. The angle of the taper is configured to substantially eliminated redeposition from the RIE on the edge.

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Paktor, Thailand

Laddawan Supadee