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Magnetic Properties of Iron Implanted Polymers and Graphite

Published online by Cambridge University Press:  25 February 2011

N. C. Koon ,
D. Weber ,
P. Pehrsson  and
A. I. Schindler
N. C. Koon
Affiliation:
Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375
D. Weber
Affiliation:
Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375
P. Pehrsson
Affiliation:
Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375
A. I. Schindler
Affiliation:
Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375
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Abstract

We have measured the magnetic properties of highly oriented pyrolytic graphite (HOPG), polyethylene (PE), and polyvinylidine fluoride (PVF2), implanted with fluences of 25 keV iron atoms ranging from 1016 to 1017 atoms/cm2 . The lowest fluence specimens were paramagnetic down to 2 K, with evidence for clusters of only a few spins, while the highest fluence specimens were clearly ferromagnetic, with magnetization curves resembling those of a set of randomly oriented soft magnetic planes. The critical fluence for formation of a ferromagnetic state appears to be between 1 and 3 × 1016 atoms/cm2 at 25 keV. Theseresults can be qualitatively understood based on the critical density for percolation of near neighbor exchange interactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 27: Symposium E – Ion Implantation and Ion Beam Processing of Materials , 1983 , 445
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

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