Browse Prior Art Database

Traceable Slider Fly Height Standard for Optical Testers

IP.com Disclosure Number: IPCOM000115805D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Zhu, LY: AUTHOR

Abstract

Disclosed is a procedure to calibrate optical fly height testers with a standard traceable to the National Bureau of Standards.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Traceable Slider Fly Height Standard for Optical Testers

      Disclosed is a procedure to calibrate optical fly height
testers with a standard traceable to the National Bureau of
Standards.

      A fly height standard can be prepared as follows.  Prepare a
slider with the same substrate, overcoat and roughness as production
sliders.  It must possess a substantially flat area which will come
in contact with a flat disk.  It must also possess a surface which
gradually recesses from the flat area.  This can be achieved with
either a large crown or a shallow taper.

      Prepare a solid transparent block or disk.  Characterize their
surface topography with either a contact or interferometric
profilometer.  In a clean room, thoroughly clean both the slider and
the disk where they will come in contact.  Then bring the two into
contact and apply a light pressure and/or rub them gently if
necessary until they adhere to each other.  The adhesion must be by
dry contact alone and no adhesive or solvent should be present.  The
adhesion should be strong enough that the slider will not fall of the
block in excess of 100g acceleration.

      By definition, there is a finite region in which the slider and
disk are in contact, i.e. zero spacing.  This region can be located
visually under a microscope.  Since both surfaces have been
characterized, the spacing profile under the entire slider can be
determined.  This slider/disk assembly can now be used as a fly...