Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.16: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Spin-wave excitation in Co/Cu(001), Fe/Co/Cu(001), and Fe/W(110) by spin-polarized electron energy loss spectroscopy — •R. Vollmer1, M. Etzkorn1, P. S. Anil Kumar1, W. Tang1, H. Ibach2, and J. Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle — 2Institut für Schichten und Grenzflächen ISG3, Forschungszentrum Jülich, 52425 Jülich
Recently, we have shown for the case of fcc Co films on Cu(001) that surface spin-wave excitations can be observed up to the surface Brillouin zone boundary by spin-polarized electron energy loss spectroscopy (SPEELS) [1]. In this contribution we compare these results with new SPEELS measurements on a 3 ML Fe film on 1 ML Co/Cu(001) and on 5 ML Fe on W(110). The SPEEL spectra of 3 ML Fe on 1 ML Co/Cu(001) show a clear spin-wave signal as well. Similar to Co, only one spin-wave loss peak is visible in the spectrum. Its width is significantly broader than that of the spin-wave peak in Co films. For 5 ML Fe on W(110) we find merely an extremely broad feature without clear maximum. It extends up to about 400 meV independent of the wavevectors. While a strong spin-wave signal can be observed only for low energies E0 of the incident electrons below about 10 eV in the case of Co/Cu(001) and 3 ML Fe on 1 ML Co/Cu(001), it is almost independent of E0 for Fe on W(110). We compare our experimental results to new theoretical calculations of spin-wave spectra of Co and Fe films [2].
[1] R. Vollmer, M. Etzkorn, P. S. Anil Kumar, H. Ibach, and J. Kirschner, Phys. Rev. Lett. 91, 147201 (2003).
[2] R. B. Muniz and D. L. Mills, Phys. Rev. B 66, 174417 (2002).