Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Surface Magnetism

MA 28.11: Vortrag

Donnerstag, 29. März 2007, 17:45–18:00, H23

Large wave vector spin wave and dispersion in 2 monolayers Fe on W(110) by spin polarized electron energy loss spectroscopy — •Wen Xin Tang, Yu Zhang, Ioan Tudosa, Jacek Prokop, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik

Spin polarized electron energy loss spectroscopy (SPEELS) is a unique technique to probe the surface large wave vector spin waves [1]. Recently the spin wave dispersion of 8 monolayer (ML) fcc Co/Cu(001) and 8 ML hcp Co/W(110) were observed[2,3]. In this report, We present SPEEL-spectra of surface spin wave in 2 monolayers Fe deposited on W(110) at room temperature. The pronounced features of large wave vector spin wave peaks are detected. For the first time the full spin wave dispersion of an Fe film is obtained up to the surface Brillioun Zone boundary along the Fe[001] direction. The measurements are compared and discussed with the theoretical results known from the literature. The broadening of the widths of the spin waves peak is attributed to the Stoner damping.

[1] M. Plihal,D. L. Mills, and J. Kirschner, Phys. Rev. Lett. 82, 2579 (1999).

[2] R. Vollmer, M. Etzkorn,P.S. Kumar, H. Ibach, and J. Kirschner, Phys. Rev. Lett. 91, 147201 (2003).

[3] M. Etzkorn, P.S. Kumar, W. X. Tang, Y. Zhang and J. Kirschner, Phys. Rev. B 72, 184420 (2005).