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Ferromagnetic Nanocomposite Films from Thermally Labile Nitride Precursors

Published online by Cambridge University Press:  10 February 2011

L. Maya ,
M. Paranthaman ,
J. R. Thompson ,
T. Thundat  and
R. J. Stevenson
L. Maya
Affiliation:
Oak Ridge National Laboratory, P.O. B. 2008, Oak Ridge TN 37831.
M. Paranthaman
Affiliation:
Oak Ridge National Laboratory, P.O. B. 2008, Oak Ridge TN 37831.
J. R. Thompson
Affiliation:
Oak Ridge National Laboratory, P.O. B. 2008, Oak Ridge TN 37831.
T. Thundat
Affiliation:
Oak Ridge National Laboratory, P.O. B. 2008, Oak Ridge TN 37831.
R. J. Stevenson
Affiliation:
K-25 Plant, P.O.B. 2008, Oak Ridge TN 37831.
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Abstract

A series of nanocomposite films containing nickel or cobalt nitride dispersed in a ceramic matrix of aluminum nitride, boron nitride or silicon nitride, were prepared by reactive sputtering of selected alloys or compounds such as nickel aluminide or cobalt suicide. Thermal treatment of the nitride composites in vacuum at ≤ 500 °C leads to selective loss of nitrogen from CoN or Ni3N to generate dispersions of the metal in the ceramic matrix. This treatment may be performed in a localized manner by means of a focused laser beam to generate microscopic features that are imaged by magnetic force microscopy. The films are potentially useful for data storage with superior chemical and mechanical stability provided by the ceramic matrix and high encoding density made possible because of the size of the magnetic particles of less than 10 nm generated in the thermal treatment. The films were characterized by chemical and physical means including FTIR, TEM, MFM and magnetic measurements. Preliminary results on similar iron composites are also described.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 213
Copyright
Copyright © Materials Research Society 1997

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References

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