Browse Prior Art Database

Reflective Thin Film for Optical Recording Media

IP.com Disclosure Number: IPCOM000120282D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Shimizu, T: AUTHOR [+2]

Abstract

Disclosed is an aluminum-based amorphous alloy thin film for use as a reflective and protective layer in optical media. The compositions of aluminum-based alloys are Al(x)M(1-x), where M = Ta, Nb, Mo, W, or Zr, and 0.2 =< x =< 0.8. The amorphous alloys are hard and strongly corrosion-resistant.

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Reflective Thin Film for Optical Recording Media

      Disclosed is an aluminum-based amorphous alloy thin film
for use as a reflective and protective layer in optical media. The
compositions of aluminum-based alloys are Al(x)M(1-x), where M = Ta,
Nb, Mo, W, or Zr, and 0.2 =< x =< 0.8. The amorphous alloys are
hard and strongly corrosion-resistant.

      Fig. 1 shows the reflectivity of this amorphous alloy film and
that of a standard aluminum film with respect to time at a
temperature of 85 degrees C and 85% humidity.

      Fig. 2 shows a magneto-optical medium using a reflective layer
of this alloy, where 1 is an aluminum-based amorphous layer, 2 is a
silicon nitride layer, 3 is a TbFeCo magnetic layer, and 4 is a
silicon- nitride-enhanced layer on a poly-carbonate substrate 5.
These layers are made by DC magnetron sputtering.

      Fig. 3 shows the read-write characteristics of a
magneto-optical medium with this amorphous alloy reflective layer.

      Fig. 4 shows a comparison of a magneto-optical medium including
this reflective layer and a conventional medium.