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Hard Carbon Overcoat for Sliders Not Requiring an Adhesion Layer

IP.com Disclosure Number: IPCOM000111849D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Franco, LP: AUTHOR [+4]

Abstract

Use of low stress nitrogen doped cvd carbon has been shown to eliminate the need for an adhesion layer on a carbon coated slider. Furthermore, the carbon film can be made thinner; thus, a process step is eliminated and the spacing between the MR sensor and magnetic layer in the disk is reduced.

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Hard Carbon Overcoat for Sliders Not Requiring an Adhesion Layer

      Use of low stress nitrogen doped cvd carbon has been shown to
eliminate the need for an adhesion layer on a carbon coated slider.
Furthermore, the carbon film can be made thinner; thus, a process
step is eliminated and the spacing between the MR sensor and magnetic
layer in the disk is reduced.

      Carbon is now used on sliders as a protective coating and to
improve characteristics of the head disk interface.  Currently a Si
adhesion layer is required under the sputtered carbon.  Low stress
nitrogenated CVD carbon has been successfully deposited on Tamba
Turbo sliders without use or need of an adhesion layer.  Furthermore,
the thickness of the CVD carbon on the slider was only 100&angstrom.
(currently 120 &angstrom.  is used).  Elimination of the adhesion
layer eliminates a process step, and reduces the distance between the
MR sensor and the disk.  The error rate is known to decrease by one
order of magnitude for every 80 angst reduction of the spacing
between the sensor and magnetic film on the disk.  Hence, the total
reduction (20 angst carbon + 35 angst Si adhesion layer) is
significant.  The sliders made with the CVD carbon have been
suspended and are being tested.  The sliders were tested to to 80K
s/s cycles without failure.  The friction meets the current design
requirement (<5 gms).