Hostname: page-component-54dcc4c588-rz4zl Total loading time: 0 Render date: 2025-09-17T01:19:02.875Z Has data issue: false hasContentIssue false
  • English
  • Français

Magnetic Properties of Nanosize Iron Clusters

Published online by Cambridge University Press:  15 February 2011

E. L. Venturini ,
J. P. Wilcoxon  and
P. P. Newcomer
E. L. Venturini
Affiliation:
Sandia National Laboratories, MS 0345, Albuquerque, NM 87185-0345
J. P. Wilcoxon
Affiliation:
Sandia National Laboratories, MS 0345, Albuquerque, NM 87185-0345
P. P. Newcomer
Affiliation:
Sandia National Laboratories, MS 0345, Albuquerque, NM 87185-0345
Get access

Abstract

Isolated, monodisperse α-Fe clusters between 1.4 and 15 nm in diameter were prepared inside inverse micelles using an oil-continuous, nonaqueous system. The magnetic properties of these clusters were studied in a SQUID magnetometer as a function of cluster size, temperature and applied magnetic field. The blocking temperature, coercive field and remanent moment of 12.5 nm Fe clusters in inverse micelles are significantly lower than those reported for clusters of similar α-Fe core size but with a surface oxide. The novel synthesis technique may yield metallic clusters with essentially intrinsic magnetic properties.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 311
Copyright
Copyright © Materials Research Society 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

1. Jacobs, I.S. and Bean, C.P. in Magnetism, edited by Rado, G. T. and Suhl, H. (Academic Press, New York, 1963), Vol. III, pp. 271–350, and references therein.Google Scholar
2. Brown, W.F. Jr., Micromagnetics (Wiley Interscience, New York, 1963.Google Scholar
3. Wohlfarth, E.P. in Magnetism, edited by Rado, G. T. and Suhl, H. (Academic Press, New York, 1963), Vol. III, pp. 351–393.Google Scholar
4. Kneller, E. in Magnetism and Metallurgy, edited by Berkowitz, A. and Kneller, E. (Academic Press, New York, 1969), Vol. 1, pp. 365–471 and references therein.Google Scholar
5. Gangopadhyay, S., Hadjipanayis, G.C., Shah, S.I., Sorensen, C.M., Kablunde, K.J., Papaefthymiou, V., Kostikas, A., J. Appl. Phys. 70, 5888 (1991).Google Scholar
6. Gangopadhyay, S., Hadjipanayis, G.C., Dale, B., Sorensen, C.M., Kablunde, K.J., Papaefthymiou, V., Kostikas, A., Phys. Rev. B 45, 9778 (1992).Google Scholar
7. Tsoukatos, A., Wan, H., Hadjipanayis, G.C., Papaefthymiou, V., Kostikas, A., Simopoulos, A., J. Appl. Phys. 72, 6967 (1993).Google Scholar
8. Tasaki, A., Tomiyama, S., lida, S., Wada, N., Uyeda, R., Jpn. J. Appl. Phys. 4, 707 (1965).Google Scholar
9. Wilcoxon, J.P., Williamson, R.L., Baughman, R.J., J. Chem. Phys. 98, 9933 (1993).Google Scholar
10. Wilcoxon, J.P., U.S. Patent No. 5,147,841, “Method for the Preparation of Metal Colloids in Inverse Micelles and Product preferred by the method”, issued 15 September 1992.Google Scholar
11. Martino, A., Wilcoxon, J.P., Kawola, J., Energy and Fuels, in press.Google Scholar
12. Berkovsky, B.M., Medvedev, V.F., Krakov, M.S., Magnetic Fluids: Engineering Applications (Oxford Univ. Press, Oxford, 1993), p. 12.Google Scholar
13. Nel, L., Compt. Rend. 228, 664 (1949).Google Scholar
14. Bean, C.P. and Livingston, J.D., J. Appl. Phys. 30 (supplement), 120S (1959).Google Scholar
15. For example, Brown, W.F. Jr., J. Appl. Phys. 30 (supplement), 130S (1959).Google Scholar
16. Billas, I.M., Becker, J.A., Chitelain, A., Heer, W.A. de, Phys. Rev. Lett. 71, 4067 (1993).Google Scholar
17. Luborsky, F.E., J. Appl. Phys. L2 (supplement), 171S (1961) and references therein.Google Scholar