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MA: Fachverband Magnetismus

MA 54: Spin Excitations I

MA 54.4: Talk

Thursday, March 17, 2011, 15:45–16:00, HSZ 04

Structural Effects on Magnon Excitations in Ultrathin Fe Films — •Tzu-Hung Chuang, Yu Zhang, Khalil Zakeri, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

We report the experimental results of high wave-vector magnon excitations in a 2 monolayer (ML) Fe film grown on 2ML Au/W(110) obtained by spin-polarized electron energy loss spectroscopy. It is found that the magnon energies in 2ML Fe on 2ML Au/W(110) are lower than the ones in 2ML Fe directly grown on W(110) [1]. This observation is correlated to the structure of the films, studied by means of low-energy electron diffraction (LEED) experiments. The LEED intensity-voltage analyses combined with the diffraction patterns revealed that the first two atomic-layers of Fe films grow on 2ML Au/W(110) are most likely the starting slabs of fcc Fe(111) surface.

The strength of the exchange coupling, estimated by using a classical Heisenberg model, is found to be weaker than the one of the bcc Fe(110) films directly grown on W(110). The experimental results are consistent with the earlier theoretical calculation of bulk fcc Fe [2].

[1] W.X. Tang,et al., Phys. Rev. Lett., 99, 087202 (2007).

[2] R.F. Sabiryanov and S.S. Jaswal, Phys. Rev. Lett. 83, 2062 (1999).