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The European Physical Journal D

, Volume 45, Issue 3, pp 433–437 | Cite as

The structure of cobalt nanoparticles on Ge(001)

  • K. SellEmail author
  • A. Kleibert
  • V. v. Oeynhausen
  • K.-H. Meiwes-Broer
Geometrical Structure and Dynamics

Abstract.

In this contribution we present scanning tunnelling microscopy (STM) and spectroscopy (STS) investigations on isolated cobalt clusters in contact with Ge(001). Mass-filtered nanoparticles with diameters ranging from 3 to 11 nm are generated using an arc cluster ion source (ACIS) and deposited under soft landing conditions (Ekin/atom < 0.5 eV). Since the tip radius is of the same order as the nanoparticle diameters the recorded STM images are significantly affected by tip folding. By means of the “blind reconstruction method" it is possible to approximate the tip shape. After a respective deconvolution of the image structural features of the particle facets become observable. According to the equilibrium shape of the clusters being a truncated octahedron in the size range under investigation, hexagonal and rectangular features appear in the images. STS is sensitive to occupied and unoccupied states near the Fermi level and reveals the existence of distinct states in the tunnelling conductivity of the substrate as well as on the clusters. The richly structured density of states of the germanium surface serves here as tip condition test. First measurements of the tunnelling conductivity of the CoN/Ge(001) are presented and discussed.

PACS.

68.37.Ef Scanning tunneling microscopy 61.46.Df Nanoparticles 61.46.Bc Clusters 

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References

  1. Clusters of atoms and molecules, edited by H. Haberland (Springer, 1994) Google Scholar
  2. U. Kreibig, M. Vollmer, Optical properties of metal clusters (Springer, 1995) Google Scholar
  3. Clusters on Surfaces, edited by K.-H. Meiwes-Broer (Springer, 2000) Google Scholar
  4. I.M.L. Billas, A. Chatelain, W.A. de Heer, Science 265, 1682 (1994) CrossRefADSGoogle Scholar
  5. J. Bansmann, M. Getzlaff, A. Kleibert, F. Bulut, R.K. Gebhardt, K.H. Meiwes-Broer, Appl. Phys. A 82, 73 (2006) CrossRefADSGoogle Scholar
  6. J. Bansmann, A. Kleibert, Appl. Phys. A 80, 957 (2005) CrossRefADSGoogle Scholar
  7. J. Bansmann et al., Surf. Sci. Rep. 56, 189 (2005) CrossRefADSGoogle Scholar
  8. F. Batallan, I. Rosenman, C.B. Sommers. Phys. Rev. B 11, 545 (1975) CrossRefADSGoogle Scholar
  9. S. Wakoh, J. Yamashita, J. Phys. Soc. Jpn 28, 1151 (1970) CrossRefADSGoogle Scholar
  10. O. Kitakami, H. Sato, Y. Shimada, F. Sato, M. Tanaka, Phys. Rev. B 56, 13849 (1997) CrossRefADSGoogle Scholar
  11. J.L. Rodriguez-Lopez, F. Aguilera-Granja, K. Michaelian, A. Vega, Phys. Rev. B 67, 174413 (2003) CrossRefADSGoogle Scholar
  12. M. Jamet, W. Wernsdorfer, C. Thirion, D. Mailly, V. Dupuis, P. Melinon, A. Perez, Phys. Rev. Lett. 86, 4676 (2001) CrossRefADSGoogle Scholar
  13. F.J. Himpsel, D.E. Eastman, Phys. Rev. B 20, 3217 (1979) CrossRefADSGoogle Scholar
  14. J. Wiebe, L. Sacharow, A. Wachowiak, G. Bihlmayer, S. Heinze, S. Blügel, M. Morgenstern, R. Wiesendanger, Phys. Rev. B 70, 035404 (2004) CrossRefADSGoogle Scholar
  15. S.N. Okuno, T. Kishi, K. Tanaka, Phys. Rev. Lett. 88, 066803 (2002) CrossRefADSGoogle Scholar
  16. M. Morgenstern, J. Wiebe, A. Wachowiak, M. Getzlaff, J. Klijn, L. Plucinski, R.L. Johnson, R. Wiesendanger, Phys. Rev. B 65, 155324 (2002) CrossRefADSGoogle Scholar
  17. M. Pratzer, H.J. Elmers, Phys. Rev. B 72, 035460 (2005) CrossRefADSGoogle Scholar
  18. S. Rusponi, N. Wiess, T. Cren, M. Epple, H. Brune, Appl. Phys. Lett. 87, 162514 (2005) CrossRefADSGoogle Scholar
  19. R. Wiesendanger, M. Bode, M. Getzlaff, Appl. Phys. Lett. 75, 124 (1999) CrossRefADSGoogle Scholar
  20. R.P. Methling, V. Senz, E.D. Klinkenberg, Th. Diederich, J. Tiggesbäumker, G. Holzhüter, J. Bansmann, K.H. Meiwes-Broer, Eur. Phys. J. D 16, 173 (2001); J. Bansmann, M. Getzlaff, A. Kleibert, F. Bulut, R.K. Gebhardt, K.H. Meiwes-Broer, Appl. Phys. A 82, 73 (2006) CrossRefADSGoogle Scholar
  21. W. Ernst, K.-L. Jonas, V. von Oeynhausen, C. Tegenkamp, H. Pfnür, Phys. Rev. B 68, 205303 (2003) CrossRefADSGoogle Scholar
  22. H. Hövel, I. Barke, Progr. Surf. Sci. 81, 53 (2006) CrossRefGoogle Scholar
  23. K.-L. Jonas, V. von Oeynhausen, J. Bansmann, K.-H. Meiwes-Broer, Appl. Phys. A 82, 131 (2006) CrossRefADSGoogle Scholar
  24. J.S. Villarrubia, Surf. Sci. 321, 287 (1994) CrossRefGoogle Scholar
  25. J.S. Villarrubia, J. Res. Natl. Inst. Stand. Technol. 102, 425 (1997) Google Scholar
  26. P.M. Williams, K.M. Shakesheff, M.C. Davies, D.E. Jackson, C.J. Roberts, S.J.B. Tendler, J. Vac. Sci. Technol. B 14/2, 1557 (1996) Google Scholar

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • K. Sell
    • 1
    Email author
  • A. Kleibert
    • 1
  • V. v. Oeynhausen
    • 1
  • K.-H. Meiwes-Broer
    • 1
  1. 1.Department of Physics, Universitätsplatz 3University of RostockRostockGermany

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