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Coercivity in Granular Fe - Al2O3*

Published online by Cambridge University Press:  21 February 2011

F. H. Streitz  and
C. L. Chien
F. H. Streitz
Affiliation:
The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, Maryland 21218
C. L. Chien
Affiliation:
The Johns Hopkins University, Department of Physics and Astronomy, Baltimore, Maryland 21218
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Abstract

We present the results of a comparison between the magnetic properties of granular Fe–Al2O3 and Fe–SiO2. Granular Fe-SiO2 was found earlier to display an anomalous increase in coercivity which appears to scale with the Fe grain size. The Fe-Al2O3 samples were prepared under similar conditions and their magnetic properties determined. The coercivity in granular Fe-Al2O3 is also seen to increase with increasing grain size, showing that the effect is not unique to the Fe-SiO2 system. A major difference between granular Fe–Al2O3 and Fe–SiO2 is the size of the Fe grains, which are smaller in Al2O3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 132: Symposium G – Multicomponent Ultrafine Microstructures , 1988 , 185
Copyright
Copyright © Materials Research Society 1989

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Footnotes

*

Work supported by ONR Contract No. N00014-85-K-0175.

References

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