Advertisement

Hyperfine Interactions

, Volume 54, Issue 1–4, pp 571–575 | Cite as

Magnetic relaxation in nanocrystalline iron-oxides

  • J. Jing
  • F. Zhao
  • X. Yang
  • U. Gonser
Magnetism and Magnetic Materials

Abstract

Nanocrystalline Fe oxides are compacted solids of fine particles. By compacting interfaces are formed between adjacent particles. Since collective magnetic relaxation and superparamagnetism depend on the anisotropic energy, it is expected that the existence of interfaces and related interface anisotropy will change the relaxation behavior of nanocrystalline Fe oxides. Measurements on nanocrystalline α-Fe2O3 and γ-Fe2O3 have shown that the exchange interaction in the interfaces is more effective in suppressing superparamagnetic relaxation upon compacting than the dipole interaction.

Keywords

Oxide Thin Film Anisotropy Fine Particle Exchange Interaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    H. Gleiter,Second Risø Int. Conf. on Metallurgy and Mater. Sci., eds. N. Hansen, A. Horsewell, T. Leffers and H. Lilholt (Risø National Laboratory, Raskilde, Denmark, 1981) p. 15.Google Scholar
  2. [2]
    Encyclopedia Mat. Sci. Eng. Suppl., ed. R.W. Cahn, Vol. 1 (Pergamon Press, 1988) p. 339.Google Scholar
  3. [3]
    U. Herr, J. Jing, R. Birringer, H. Gleiter and U. Gonser, Appl. Phys. Lett. 50 (1987) 472.CrossRefADSGoogle Scholar
  4. [4]
    S. Mørup, J.A. Dumesic and H. Topsøe, in:Applications of Mössbauer Spectroscopy, ed. R.L. Cohen, Vol. 2 (Academic Press, 1980) Ch. 1.Google Scholar
  5. [5]
    A.M. van der Kraan, Phys. Stat. Sol. (a) 18 (1973) 215.Google Scholar

Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1990

Authors and Affiliations

  • J. Jing
    • 1
  • F. Zhao
    • 1
  • X. Yang
    • 1
  • U. Gonser
    • 1
  1. 1.FB 12.1 WerkstoffwissenschaftenUniversität des SaarlandesSaarbrückenF.R. Germany

Personalised recommendations