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Synthesis and Magnetic Characteristics of Granular Co Dispersions in a Polymer Matrix

Published online by Cambridge University Press:  28 February 2011

Eric Kay ,
C. Laurent ,
S.S.P. Parkin  and
D. Mauri
Eric Kay
Affiliation:
IBM Research Division, Almaden Research Center, San.Jose, CA 95120-6099
C. Laurent
Affiliation:
IBM Research Division, Almaden Research Center, San.Jose, CA 95120-6099
S.S.P. Parkin
Affiliation:
IBM Research Division, Almaden Research Center, San.Jose, CA 95120-6099
D. Mauri
Affiliation:
IBM Research Division, Almaden Research Center, San.Jose, CA 95120-6099
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Abstract

We have produced thin film composite matrices containing granular transition metals in the zero valent state and have found onset of percolation at a much lower volume fraction than was the case for Au, albeit for significantly smaller transition metal particles. At volume fractions below percolation these granular composites are superparamagnetic down to 6°K. Remanent magnetization and hysteretic ferromagnetic behavior was not observed until we were slightly above the onset of electrical percolation. We interpret this result as indicative of ferromagnetic ordering among the transition metal grains. No significant reduction in magnetic moment due to size effects or to chemical interaction with the matrix was observed. A very small size dispersion of the metal clusters was indicated both from magnetic a well as electron microscopy measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 423
Copyright
Copyright © Materials Research Society 1990

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References

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