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Method of making magnetic head sliders

  • US 4,624,048 A
  • Filed: 08/06/1984
  • Issued: 11/25/1986
  • Est. Priority Date: 08/17/1983
  • Status: Expired due to Fees
First Claim
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1. The method for making magnetic head sliders out of a flat workpiece of highly pure aluminum whose first longitudinal surface corresponds, in its dimension that is normal to the length of the workpiece, to the length of the magnetic head slider, and whose second longitudinal surface that is normal to the first longitudinal workpiece surface is equipped with at least one magnetic head having its field line entry and exit surfaces flush with the first longitudinal workpiece surface, said method comprising the steps of:

  • anodically oxidizing a predetermined area of said first longitudinal workpiece surface extending in the direction of the length of the magnetic head slider to form an anodic oxidation aluminum oxide layer, said predetermined area extending along the edges of said magnetic head sliders and having the shape required to form rail surfaces;

    etching said workpiece, using said anodically oxidized layer as a mask, to form recessed regions of predetermined depth and simultaneously form rails of the same configuration as said rail surfaces; and

    lapping said rail surfaces to give a surface finish defined by a predetermined peak-to-valley height so that said rails and said recessed region produce a predetermined flight height when said magnetic head slider is positioned adjacent a moving magnetic medium.

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