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Novel Crystalline Magneto-Optical Media Fabrication Process

IP.com Disclosure Number: IPCOM000100526D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Related People

Marinero, E: AUTHOR

Abstract

A fabrication method is disclosed to generate magneto-optical materials which have inherent superior structural, chemical and optical properties to those observed in conventional rare-earth transition metal alloys.

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This is the abbreviated version, containing approximately 54% of the total text.

Novel Crystalline Magneto-Optical Media Fabrication Process

       A fabrication method is disclosed to generate
magneto-optical materials which have inherent superior structural,
chemical and optical properties to those observed in conventional
rare-earth transition metal alloys.

      The process includes the sputter deposition of magneto-optic
alloys and compounds to produce amorphous thin film at room
temperature.  The magnetic state of the material is induced by
transforming the structure into its crystalline state.  The annealing
step is effected by utilizing a photon source, such as an excimer
laser. Therefore, only the thin film and the substrate/metal
interfacial layers experience the high temperature phase. This
permits the utilization of low melting temperature substrates and the
heating step can be effected either during the material growth or as
a post-processing step outside the vacuum chamber.  As an example,
the Heusler alloy PtMnSb was deposited as an amorphous alloy and then
exposed to single excimer laser pulses of 16 ns duration. Comparable
magneto- optic activity was measured for alloys crystallized in this
fashion and those subjected to 800@C annealing for several hours.

      In addition to the reduction in annealing time, and allowing
plastic substrates to be utilized, this technique permits the
formation of mixed crystallographic phases by changing the rate of
cooling of the laser-exposed film. Similarly, solid solutions of
small c...