Abstract

The properties of thin films are directly connected with the atomic structure. At elevated temperatures this structure is determined by atomic dynamics. Pronounced effects are expected for thin films of low coverage. We have investigated electronic and dynamical properties of a submonolayer Fe film on a W(1 1 0) substrate with nuclear resonance scattering (NRS) in grazing–incidence geometry. This atomistic technique is best suited for such investigations due to its element (isotopic) and submonolayer sensitivity as demonstrated in the model system of Fe/W(1 1 0). A simple relaxation model was used to explain the temperature dependence of the NRS spectra. The relaxation rates and diffusion coefficients have been calculated.

Author Keywords: X-ray scattering, diffraction, and reflection; Diffusion and migration; Surface diffusion; Epitaxy; Mössbauer spectroscopy; Iron; Tungsten; Vicinal single crystal surfaces

Article Outline

1. Introduction

2. Experimental details

3. Experimental method

4. Results and discussion

5. Conclusions

Acknowledgements

References

(9K)
Fig. 1. A beat pattern corresponding to a quadrupole interaction is observed at RT. At 370 and 470 K a shift of the beats to larger time values is clearly visible. The beats disappear finally at 670 K. The spectra are shifted relatively to each other. The inset shows the diffusion coefficients D (m² s⁻¹) estimated from the increase of the beat period.

(5K)
Fig. 2. Comparison of the first room temperature measurement () and the RT measurement after the highest temperature 670 K (&z.cirf;). The shape of the spectrum remains without change after and between measurements at higher temperatures (Fig. 1). This is a proof of the temperature stability of the sample and the reversibility of the effect shown in Fig. 1. The dashed line demonstrates the natural decay of the excited energy state of the ⁵⁷Fe nucleus.

References

1. U. Gradmann, G. Liu, H.J. Elmers and M. Przybylski. Hyperfine Interact. 57 (1990), p. 1845. Abstract-INSPEC   | $Order Document

2. J. Korecki, M. Kubik, N. Spiridis and T. lzak. Acta Phys. Polonica A 97 (2000), p. 129. Abstract-INSPEC   | $Order Document

3. R. Röhlsberger, J. Bansmann, V. Senz, K.L. Jonas, A. Bettac, O. Leupold, R. Rüffer, E. Burkel and K.H. Meiwes-Broer. Phys. Rev. Lett. 86 (2001), p. 5597. Abstract-Compendex | Abstract-INSPEC   | $Order Document | Full Text via CrossRef

4. R. Rüffer and A.I. Chumakov. Hyperfine Interact. 97–98 (1996), p. 589.

5. B. Sepiol, A. Meyer, G. Vogl, R. Rüffer, A.I. Chumakov and A.Q.R. Baron. Phys. Rev. Lett. 76 (1996), p. 3220. Abstract-INSPEC   | $Order Document | APS full text | Full Text via CrossRef

6. B. Sepiol, A. Meyer, G. Vogl, H. Franz and R. Rüffer. Phys. Rev. B 57 (1998), p. 10433. Abstract-INSPEC   | $Order Document | APS full text | Full Text via CrossRef

7. H. Thiess, M. Kaisermayr, B. Sepiol, M. Sladecek, R. Rüffer and G. Vogl. Phys. Rev. B 64 (2001), p. 104305. Full Text via CrossRef

8. M. Sladecek, B. Sepiol, M. Kaisermayr, J. Korecki, B. Handke, H. Thiess, O. Leupold, R. Rüffer and G. Vogl. Surf. Sci. 507–510C (2002), p. 124. SummaryPlus | Full Text + Links | PDF (126 K)

9. R. Röhlsberger, J. Bansmann, V. Senz, K.L. Jonas, A. Bettac, K.H. Meweis-Broer and O. Leupold. Phys. Rev. B 67 (2003), p. 245412. Full Text via CrossRef

10. H. Grünsteudel, V. Rusanov, H. Winkler, W. Meyer-Klaucke and A.X. Trautwein. Hyperfine Interact. 122 (1999), p. 345. Abstract-INSPEC   | $Order Document | Full Text via CrossRef

11. G.V. Smirnov. Hyperfine Interact. 123–124 (1999), p. 31. Full Text via CrossRef

12. J. Hauschild, H.J. Elmers and U. Gradmann. Phys. Rev. B 57 (1998), p. R677. Abstract-INSPEC   | $Order Document | APS full text | Full Text via CrossRef

13. M. Przybylski. Hyperfine Interact. 113 (1998), p. 135. Abstract-INSPEC   | $Order Document | Full Text via CrossRef

14. M. Przybylski and U. Gradmann. Phys. Rev. Lett. 59 (1987), p. 1152. Abstract-INSPEC   | $Order Document | Full Text via CrossRef

15. M. Przybylski and U. Gradmann. J. Appl. Phys. 63 (1988), p. 3652. Abstract-INSPEC   | $Order Document | Full Text via CrossRef

16. J.A. Tjon and M. Blume. Phys. Rev. 165 (1968), p. 456. Full Text via CrossRef

17. S. Dattagupta and K. Schroeder. Phys. Rev. B 35 (1987), p. 1525. Abstract-INSPEC   | $Order Document | Full Text via CrossRef

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