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Magnetic Properties of Ions Implanted in Glass; Fe in SiO2

Published online by Cambridge University Press:  25 February 2011

R.A. Weeks ,
M.C. Silva ,
G. Kordas ,
D.L. Kinser ,
J. Martinelli  and
B.R. Appleton
R.A. Weeks
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
M.C. Silva
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
G. Kordas
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
D.L. Kinser
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
J. Martinelli
Affiliation:
Vanderbilt University, Nashville, TN 37235, USA
B.R. Appleton
Affiliation:
Oak Ridge National Laboratories, Oak Ridge, TN 37831, USA
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Abstract

Silica glass platelets have been implanted with Fe(+) ions, 125 KeV and 10⋀-5 A to doses of 10⋀14 cm⋀-2, 10⋀15 cm⋀-2, 10⋀16 cm⋀-2 and 5 x 10⋀16 cm⋀-2. Ion scattering measurements show that the peak of the Fe ion distribution is ~95 nm below the sample surface, approximately Gaussian, with a width at half maximum amplitude of 100 nm. The intensity of a component in the EPR spectra of implanted samples with a width of 300 gauss and an approximately isotropic shape increases with increasing dose. The increase, proportional to dose for doses <⋀16 cm⋀-2, is larger for doses ≥10⋀16 cm⋀-2. In addition for doses ≥10⋀16 cm⋀-2, the component is orientation dependent. Subsequent heat treatments in air at 700° and 800° C alter the shape, intensity, and orientation dependence of the component. The spectral component in as-implanted samples is attributed to paramagnetic states of Fe ions. The threshold for magnetic exchange interactions and consequently long range magnetic ordering at ~300K occurs at a dose ≥10⋀16 cm⋀-2. Data on effects of thermal treatments on intensities and shapes are interpreted in terms of changing chemical composition of precipitating-particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 45: Symposium A – Ion Beam Processes in Advanced Electronic Materials and Device Technology , 1985 , 59
Copyright
Copyright © Materials Research Society 1985

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References

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