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Mechanisms of Initialization of Doped Sb-Te Phase-Change Media

Published online by Cambridge University Press:  01 February 2011

Samantha J. Towlson ,
Clifford A. Elwell ,
Clare E. Davies  and
A. Lindsay Greer
Samantha J. Towlson
Affiliation:
University of Cambridge, Dept. of Materials Science and Metallurgy, Cambridge, UNITED KINGDOM
Clifford A. Elwell*
Affiliation:
University of Cambridge, Dept. of Materials Science and Metallurgy, Cambridge, UNITED KINGDOM
Clare E. Davies
Affiliation:
Plasmon Data Systems Ltd, Melbourn, UNITED KINGDOM
A. Lindsay Greer
Affiliation:
University of Cambridge, Dept. of Materials Science and Metallurgy, Cambridge, UNITED KINGDOM
*
* corresponding author.
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Abstract

Laser initialization of the chalcogenide optical-recording medium Ag-In-Sb-Te is investigated using transmission electron microscopy of the resulting microstructure. Initialization beam power and velocity are varied. The average inhomogeneous strain of the chalcogenide is estimated from X-ray peak broadening. At high power and low velocity a clearly defined columnar grain structure with low strain is produced, typical of directional solidification. At low power and high velocity the initialized structure has a high density of defects and high strain; this is attributed to crystallization from the amorphous rather than the liquid state. The beam power and linear velocity of laser initialization may therefore be used to control the microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 803: Symposia GG/HH – Advanced Characterization Techniques for Data Storage Materials – Phase Change and Nonmagnetic Materials for Data Storage , 2003 , HH4.6
Copyright
Copyright © Materials Research Society 2004

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References

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