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Browse Prior Art Database

High Quality Crystalline Films for Recording Media

IP.com Disclosure Number: IPCOM000110477D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Chen, M: AUTHOR [+4]

Abstract

Disclosed is a method that permits the fabrication of materials with intrinsically high magneto-optic activity for high performance, reversible optical storage recording. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

High Quality Crystalline Films for Recording Media

      Disclosed is a method that permits the fabrication of materials
with intrinsically high magneto-optic activity for high performance,
reversible optical storage recording.

                            (Image Omitted)

      The present method utilizes multi-layer films of Bi-substituted
garnet films with an appropriate spacer of Cr and SiOx can be
fabricated by sputter-deposition and then by annealing at
temperatures of 600 to 650~C for about 30 sec or longer.  The ramp-up
rate to 650~C is about 100C/s.  The thicknesses of each garnet and
spacer layer are chosen to be about 100A, and 5 to 10A, respectively,
to optimize the magnetic properties for recording and to minimize the
grain size as well.  These films consist of grains whose average size
is about 150A, much smaller than those of similar thickness
crystallized under the same condition.  The surface roughness is also
improved in multi-layer films.  The noise from light scattering in
the multi-layers is lower than that of a single layer garnet film.
The multi-layer films are found to have a high Faraday rotation
activity and excellent squareness.  The method disclosed here also
provides a high absorption medium by using metals such as Cr as an
in-between layer, which improves power sensitivity for writing bits.

      Disclosed anonymously.