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Metallic Diffusion Barriers for Mo Media

Published online by Cambridge University Press:  21 February 2011

A. P. Taylor ,
K. D. Cornett ,
U. J. Gibson  and
T. K. Hatwar
A. P. Taylor
Affiliation:
University of Arizona, Optical Sciences Center. Tucson, Arizona 85721
K. D. Cornett
Affiliation:
University of Arizona, Optical Sciences Center. Tucson, Arizona 85721
U. J. Gibson
Affiliation:
University of Arizona, Optical Sciences Center. Tucson, Arizona 85721
T. K. Hatwar
Affiliation:
Eastman Kodak Company, Rochester. New York
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Abstract

Degradation of magneto-optic media by preferential oxidation of the rare-earth component, typically Tb. is a serious limitation to their lifetime and utility. In this paper, we present data on diffusion studies of 0 and TbFeCo through thin overlayers of a series of metals with differing electronegativities. Samples of TbFeCo were overcoated with Sm. Gd, Zr, Ni. or Pt, then vacuum transferred to an x-ray photoelectron spectrometer (XPS). Heating in situ was used to accelerate the diffusion process, and XPS to determine the extent of the diffusion. After 20 hours, the samples were depth profiled to further examine the effects of heating. The metals with the lowest electronegativities, Sm and Gd. provided the greatest resistance to Tb diffusion; however. it was noted that partial oxidation of these metals occurred during their deposition. These data suggest the use of thin rare-earth oxide diffusion barriers in connection with thick refractory overlayers for the protection of MO media.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 150: Symposium F – Materials for Magneto-Optic Data Storage , 1989 , 209
Copyright
Copyright © Materials Research Society 1989

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References

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