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Heat-Pulse Fabrication of Magneto-Optical Garnet Films

IP.com Disclosure Number: IPCOM000102778D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 45K

Publishing Venue

IBM

Related People

Huang, T: AUTHOR [+4]

Abstract

Disclosed is a process technique that permits the fabrication of materials with intrinsically high magneto-optic activity for high performance and density reversible optical storage technology.

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Heat-Pulse Fabrication of Magneto-Optical Garnet Films

      Disclosed is a process technique that permits the fabrication
of materials with intrinsically high magneto-optic activity for high
performance and density reversible optical storage technology.

      One example utilizing the present technique is presented in
Fig.1. Thin films of Bi-substituted garnet films can be fabricated by
annealing sputter-deposited amorphous films with corresponding
compositions at temperatures of 600 to 650oC for about 10 sec. or
longer. These films exhibit a high Faraday rotation activity, and
magnetic properties, comparable to those obtained by a conventional
oven annealing for longer times.  Potential advantages of this
technique include the utilization of a wider variety of substrates
than conventionally used for garnet film fabrication; the ability of
controlling the crystallization from a few seconds to minutes permits
direct control of the grain structure and surface morphology
essential for reducing noise in thermomagnetic recording. The process
disclosed here also makes the manufacturability of these materials
more likely, namely, by reducing the annealing time by orders of
magnitude it can permit an in-line process where the disks are fed
from the deposition system into the pulsed annealing apparatus.

      Fig.1  Faraday rotation, and coercive force, and saturation
magnetization in Bi-substituted garnet thin films as a function of
pulse heat annealing times.

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