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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

REFERENCES

1. Abeles, B., Sheng, P., Couts, M.D., and Arie, Y., Adv. Phys. 24, 407 (1975).Google Scholar
2. Bean, C.P. and Livingston, J.D., J. Appl. Phys. 30, 120S (1959).Google Scholar
3. Néel, L., Compt. rend. 228, 664 (1949)Google Scholar
4. see e.g., Morrish, A.H., The Physical Principles of Magnetism, Krieger Publishing, Malabar, Florida (1983).Google Scholar
5. Xiao, Gang and Chien, C.L., Appl. Phys. Lett. 51, 1280 (1987).CrossRefGoogle Scholar
6. Liou, S.H. and Chien, C.L., Appl. Phys. Lett. 32, 512, (1988).Google Scholar
7. Stoner, E.C. and Wohlfarth, E.P., Phil. Trans. Roy. Soc. A-240, 599 (1948).Google Scholar
8. Luborsky, F.E., J. Appl. Phys. 29, 309 (1958).Google Scholar