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Structure and magnetism of self-organized Co islands

  • J. Bansmann
  • L. Lu
  • V. Senz
  • A. Bettac
  • M. Getzlaff
  • K. H. Meiwes-Broer
Conference paper

Abstract

This investigation turns its attention to magnetic effects of cobalt islands on a non-magnetic substrate. The preparation technique of MBE enables the creation of fiat and well-ordered surfaces of hcp-Co(0001) if the evaporation onto a W(110) crystal is carried out at ambient temperatures. Subsequent heating to about. 1000 K causes a phase transition from thin filmq to islands. The investigations are carried out in VUV photoemission with polarized synchrotron radiation, LEED and Scanning Tunneling Microscopy (STM). We employ the technique of magnetic linear dichroism in the angular distribution of photoemission (MLDAD) from valence bands. The MLDAD effect shows significant differences between a flat cobalt layer and cobalt islands. Variations due to the excitation energies are discussed with respect to a fully-relativistic bulk-band-structure calculation.

PACS

61.46. +w Clusters nanoparticles and nanocrystalline materials 75.25 +z Spin arrangements in magnetically Ordered materials 75.30.Pd Surface magnetism 

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References

  1. 1.
    U. Gradmann: in Handbook of Magnetic Materials, Vol. 7, 18. Chap. 1, ed. by K.H.J. Buschow ( North Holland, Amsterdam 1993 ) 19.Google Scholar
  2. 2.
    L. Baumgarten, C.M. Schneider, H. Petersen, F. Schäfers, J. Kirschner: Phys. Rev. Lett; 65, 492 (1990) 20.Google Scholar
  3. 3.
    C. Roth, F.U. Hillebrecht, H.B. Rose, E. Kisker: Phys. Rev. Lett. 70, 3479 (1994) 21.Google Scholar
  4. 4.
    G. Rossi, F. Sirotti, N.A. Cherepkov, F. Combet Farnoux, G. Panaccione: Solid State Commun. 90. 557 (1994) 22.Google Scholar
  5. 5.
    D. Venus: Phys. Rev. B 48, 6144 (1993)ADSCrossRefGoogle Scholar
  6. 6.
    N.A. Cherepkov: Phys. Rev. B 50, 13813 (1994)ADSCrossRefGoogle Scholar
  7. 7.
    B.T. Thole, G. van der Laan: Phys. Rev. B 44, 12424 (1991)ADSCrossRefGoogle Scholar
  8. 8.
    J. Bansmann, L. Lu, M. Getzlaff, M. Fluchtmann, J. Braun: J. Magn. Magn. Mater. 185, 94 (1998);ADSCrossRefGoogle Scholar
  9. J. Bansmann, M. Getzlaff, G. Schönhense, M. Fluchtmann, J. Braun: Surf. Sci. 404, 365 (1998)CrossRefGoogle Scholar
  10. 9.
    A. Ramps, G. Güntherodt, D. Hartmann, J. Henk: Phys. Rev. B 57, 14 370 (1998)Google Scholar
  11. 10.
    B. G Johnson, P.J. Berlowitz, D.W. Goodman: Surf. Sci. 217, 13 (1989)ADSCrossRefGoogle Scholar
  12. 11.
    J.G. Ociepa, P.J. Schultz, K. Griffiths, P.R. Norton: Surf. Sci. 225,281 (1.990)Google Scholar
  13. 12.
    M. Getzlaff, J. Bansmann, J. Braun, G. Schönhense: J. Magn. Magn. Mater. 161, 70 (1996)ADSCrossRefGoogle Scholar
  14. 13.
    H. Knoppe, E. Bauer: Phys. Rev. B 48, 1794 (1993)ADSCrossRefGoogle Scholar
  15. 14.
    G. Carreau, M. Fade, E. Beaurepaire, K. Baberschke: Phys. Rev. B 55, 330 (1997)ADSCrossRefGoogle Scholar
  16. 15.
    H. Fritzsche, J. Kohlhepp, U. Gradmann: Phys. Rev. B 51, 15 933 (1995)Google Scholar
  17. 16.
    H. Pinkvos et. al,: Magnetism and Structure in Systems of Reduced Dimension, ed. by R.F.C. Farrow et al., NATO ASI Series B: Physics, Vol. 309 ( Plenum Press, New York 1993 )Google Scholar
  18. 17.
    F. Schäfers, W. Peatman, A. Eyers, Ch. Heckenkamp, G. Schönhense, U. Heinzmann: Rev. Sci. Instrum. 57, 1032 (1986)ADSCrossRefGoogle Scholar
  19. 18.
    H. Pinkvos, H. Poppa, E. Bauer, J. Hurst: Ultramicroscopy 47, 339 (1992)Google Scholar
  20. 19.
    D. Reuter, G. Gerth, J. Kirschner: Phys. Rev. B 57, 2520 (1998)ADSCrossRefGoogle Scholar
  21. 20.
    M. Bode, R. Pascal, R. Wiesendanger: Surf. Sci. 344, 185 (1995)ADSCrossRefGoogle Scholar
  22. 21.
    W. Kuch, M-T. Lin, K. Meinel, C.M. Schneider, J. Noffke, J. Kirschner: Phys. Rev. B 51, 12627 (1995)ADSCrossRefGoogle Scholar
  23. 22.
    J. Braun (private communication)Google Scholar

Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • J. Bansmann
    • 1
  • L. Lu
    • 1
  • V. Senz
    • 1
  • A. Bettac
    • 1
  • M. Getzlaff
    • 2
  • K. H. Meiwes-Broer
    • 1
  1. 1.Fachbereich PhysikUniversität RostockRostockGermany
  2. 2.Institut far Angewandte PhysikUniversität HamburgHamburgGermany

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