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MA: Fachverband Magnetismus

MA 13: Surface Magnetism

MA 13.6: Vortrag

Dienstag, 26. Februar 2008, 11:45–12:00, EB 301

High wave vector spin waves in 1 ML Fe/W(110) — •Jacek Prokop, Yu Zhang, Wen Xin Tang, Ioan Tudosa, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

We report on a first observation of the high wave vector spin wave (SW) excitations in the ferromagnetic Fe monolayer (ML) epitaxially grown on a W(110) single crystal. Using a spin-polarized electron energy loss spectroscopy (SPEELS) we measured a spin wave dispersion along the [001] direction. The ML Fe was deposited at room temperature (RT), and annealed at 900 K in ultrahigh vacuum (UHV) condition. The SPEELS measurements were performed at 120 K. The SW excitations show up as fine unique features emerging from an elastic peak shoulder in the minority electron spectrum. The measured asymmetry for the Fe ML magnon peaks achieves 30 %. The magnons in the iron ML are much softer than that in the bulk Fe, and those in the 2 ML Fe/W(110) film [1]. We show that the energies of the SW excitations in the Fe ML are also lower than the surface mode of the bcc Fe(110) surface, and the SW are strongly damped. The obtained results will be discussed and compared with the existing calculations performed within the itinerant electron theory.