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Partial Overcoat of a Magnetic Recording Head Air Bearing Surface

IP.com Disclosure Number: IPCOM000115944D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Malone, D: AUTHOR

Abstract

High density magnetic recording systems require close magnetic spacings to achieve the necessary recording playback signal resolution, pulse shapes and amplitudes. Magnetic spacing is a dominant variable in the recording process. Rigid disk drives must at the same time provide adequate durability in the form of start/stop, stiction and flyability for the head-disk interface. Current disk drives utilize overcoats and lubricants on the disk surface and overcoats on the heads Air Bearing Surface (ABS) to enhance the mechanical durability. Some form of a Carbon OverCoat (COC) is commonly used today. The overcoat, while improving mechanical durability, increases the magnetic spacing which normally reduces the magnetic capability. A balance must always be achieved between the mechanical and magnetic requirements.

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Partial Overcoat of a Magnetic Recording Head Air Bearing Surface

      High density magnetic recording systems require close magnetic
spacings to achieve the necessary  recording playback signal
resolution, pulse shapes and amplitudes.  Magnetic spacing is a
dominant variable in the recording process.  Rigid disk drives must
at the same time provide adequate durability in the form of
start/stop, stiction and flyability for the head-disk interface.
Current disk drives utilize overcoats and lubricants on the disk
surface and overcoats on the heads Air Bearing Surface (ABS) to
enhance the mechanical durability.  Some form of a Carbon OverCoat
(COC) is commonly used today.  The overcoat, while improving
mechanical durability, increases the magnetic spacing  which normally
reduces the magnetic capability.  A balance must always be achieved
between the mechanical and magnetic requirements.

      The method described in this invention provides a method to
reduce the magnetic spacing (to the R/W element) while maintaining
the mechanical durability requirements.  Fig. 1 shows a drawing of an
IBM* magnetic recording head  as viewed from the ABS side.  A carbon
overcoat is applied to the three rails  of the slider ABS (those
indicated by the arrows).  At todays fly heights, the overcoat
thickness can be a significant portion of the fly height budget.
Fig. 2 shows the invention concept.  The overcoat is introduced on
the side rails and only on the leading portion...