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Microscopic Asperity and Depression Standard for Magnetic Recording Disks and Method for Making the Same

IP.com Disclosure Number: IPCOM000014311D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-19
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Abstract

Described is a standard for the calibration of tools used to screen magnetic recording disk substrates for the presence of defects that might cause magnetic drop-out errors or glide height errors. The novel feature of this standard is the fabrication of microscopically small and precisely defined asperities and depressions in a regular orderly array with well-controlled heights, depths, and shapes by means of deposition and milling with the focused ion beam (FIB) tool. The calibration standard extends the range of simulated defects beyond those that are currently available, thus making it possible to screen substrates for ever smaller microscopic defects that are becoming increasingly more deleterious as magnetic recording technology advances to higher recording densities.

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  Microscopic Asperity and Depression Standard for Magnetic Recording Disks and Method for Making the Same

   Described is a standard for the calibration of tools used to screen magnetic
recording disk substrates for the presence of defects that might cause magnetic
drop-out errors or glide height errors. The novel feature of this standard is the
fabrication of microscopically small and precisely defined asperities and
depressions in a regular orderly array with well-controlled heights, depths, and
shapes by means of deposition and milling with the focused ion beam (FIB) tool.
The calibration standard extends the range of simulated defects beyond those that
are currently available, thus making it possible to screen substrates for ever
smaller microscopic defects that are becoming increasingly more deleterious as
magnetic recording technology advances to higher recording densities.

   A preferred embodiment of the invention utilizes the features described as
follows. The calibration standard employs a magnetic recording disk substrate
made from glass, Si, and/or NiP coated aluminum/magnesium alloy. The substrate
has fabricated on it a rectangular or square array of nominally square pits
and/or bumps; the square pits and/or bumps are arranged with a nominal pitch
between pit edges and/or bump edges of 200 microns, edge-to-edge. Also, the pits
and/or bumps have nominally square lateral dimensions from 1.6 x 1.6 microns to
0.2 x 0.2 microns, and have, respectively, depths or heights from 10...