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Magnetic properties of CoO nanoparticles

  • C. F. J. Flipse
  • C. B. Rouwelaar
  • F. M. F. de Groot
Conference paper

Abstract

The magnetic circular X-ray dichroism (MCXD) of CoO nanoparticies was measured at low temperatures and in high magnetic fields. The particles show a superparamagnetic behaviour at room temperature, and a large orbital contribution to the magnetic moment at low temperatures was observed. This enhancement of orbital magnetism is largely determined by the contribution of the surface atoms. The larger spin—orbit coupling of the electrons of the surface atoms of the particle can cause a change in magnetic ordering in the core of the particles.

PACS

71.23.An Theories and models; localized states 75.30.Pd Surface magnetism 75.50.Ee Antiferromagnetics 75.50.Tt Fine-particle systems 

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References

  1. 1.
    R.W. Chantrall, K. O’Grady: Applied Magnetism, ed. by R. Gerber et al. ( Kluwer Academic Publishers, The Netherlands 1994 ) p. 113CrossRefGoogle Scholar
  2. 2.
    M.M. Ibrahim, S. Darwish, M. Seehra; Phys. Rev. B 51, 2955 (1995)ADSCrossRefGoogle Scholar
  3. 3.
    S. Gider, D. Awschaiom, T. Douglas, S. Mann, M. Cha-parala: Science 268, 77 (1995)ADSCrossRefGoogle Scholar
  4. 4.
    L. Neel: in Low Temperature Physics, ed. by C. Dewitt, B. Dreyfus, P.D. de Germes ( Gordon and Beach, New York 1962 ) p. 413Google Scholar
  5. 5.
    R.H. Kodama, S.A. Makhlout, A.B. Berkowitz: Phys. Rev. Lett. 79, 1393 (1997)ADSCrossRefGoogle Scholar
  6. 6.
    A. Partridge, S.L.G. Toussaint, C.F.J. Flipse, L.J. Ijzendoom, L.C.A. van den Oetelaar: J. Vac, Sci. Technol. B 14, 585 (1996)CrossRefGoogle Scholar
  7. 7.
    R. Mason (Ed.): EMT’ Beamline Handbook, December, 1994Google Scholar
  8. 8.
    C.D. Wagner, W.M. Riggs, L.E. Davis, J.F. Moulder: Handbook of X-ray photoelectron spectroscopy, (Perkin-Elmer Corporation, Eden Prairie, Minnesota, USA 1978 )Google Scholar
  9. 9.
    B.T. Thole, P. Carra, F. Sette, G. van der Laau: Phys. Rev. Lett, 68, 1943 (1992)ADSCrossRefGoogle Scholar
  10. 10.
    P. Carra, B.T. Thole, M, Altarelli, X. Wang: Phys, Rev. Lett. 70, 694 (1993)ADSCrossRefGoogle Scholar
  11. 11.
    C.T. Chen, Y.U. Idzerda, H.J. Lin, N.V. Smith, G. Meigs, E. Chaban, G. Ho, E. Pellegrin, F. Sette: Phys. Rev, Lett. 75, 152 (1994)ADSCrossRefGoogle Scholar
  12. 12.
    Y. Wu, J. Stoehr, B.D. Hersmeier, MG. Samant, D. Weller: Phys. Rev. Lett. 69, 2307 (1992)ADSCrossRefGoogle Scholar
  13. 13.
    R.D, Cowen: The theory of Atomic Structure and Spectra (University of California Press, Berkeley 1981); J. Opt, Soc. Am. 58. 808 (1968)Google Scholar
  14. 14.
    F.M.F. de Groot: Ph.D. thesis, University of Nijmegen 1991Google Scholar
  15. 15.
    C. Kittel: Introduction to Solid State Physics ( John Wiley, New York 1986 )Google Scholar
  16. 16.
    V. Fernandez, C. Vettier, F. de Bergevin, C. Giles, W. Neu-beck: private communicationsGoogle Scholar

Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • C. F. J. Flipse
    • 1
  • C. B. Rouwelaar
    • 1
  • F. M. F. de Groot
    • 2
  1. 1.Department of PhysicsEindhoven University of TechnologyThe Netherlands
  2. 2.Solid State Physics Laboratory, Material Science CentreUniversity of GroningenThe Netherlands

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