Browse Prior Art Database

Radiation-Hardened Polymer Disk Overcoat

IP.com Disclosure Number: IPCOM000112437D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Krajnovich, DJ: AUTHOR

Abstract

Disclosed is a method for creating a textured disk overcoat based on radiation hardening of a thin polymer film.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 65% of the total text.

Radiation-Hardened Polymer Disk Overcoat

      Disclosed is a method for creating a textured disk overcoat
based on radiation hardening of a thin polymer film.

      After depositing the magnetic layers in the usual way (e.g., by
sputtering), a thin layer of polymer is applied to the disk.  The
polymer is then exposed to radiation (e.g., ultraviolet light or a
low-flux ion beam).  For a number of organic polymers, data exists
[1-5]  showing that mild radiation treatment leads to the formation
of a hard, carbon-rich surface layer with a well-defined degree of
surface texture and modified surface reactivity.  These changes come
about by preferential ejection of volatile oxygen-containing (and/or
nitrogen-containing) species.  The surface of a radiation-hardened
organic polymer film may in fact be very similar to conventional
amorphous hydrogenated carbon overcoats prepared by sputtering, which
contain up to 40 atomic % hydrogen.  Both can be thought of as very
hard plastics.

      The key feature of the invention is to use radiation hardening
of thin polymer films to create overcoats with desirable mechanical
and chemical properties.  While the invention was originally
conceived with organic polymers in mind (i.e., converting
C,H,O,N-containing polymers into hard, carbon-enriched films), the
invention might also be applicable to other classes of polymers,
including inorganic polymers.  A second feature of the invention is
to exploit the surface roughenin...