Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Surface Magnetism

MA 28.4: Vortrag

Donnerstag, 29. März 2007, 16:00–16:15, H23

YCo₂: Intrinsic magnetic surface of a paramagnetic bulk material — •Yury Dedkov¹, Clemens Laubschat¹, Sergii Khmelevskyi², Josef Redinger², Peter Mohn², and Michael Weinert³ — ¹Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²Center for Computational Materials Science, Vienna University of Technology, Vienna, Austria — ³Departament of Physics, University of Wisconsin-Milwaukee, P. O. Box 413, Milwaukee, Wisconsin 53201, USA

Here we report on results of a spin-resolved photoelectron spectroscopic (SRPES) study of YCo₂ thin films (150Å-thick) grown on a W(110) substrate. The films were prepared by co-deposition of stoichiometric amounts of Y and Co on to a clean W surface followed by thermal annealing leading to (2×2) overstructure with respect to W(110) in the low-energy electron diffraction pattern indicated formation of a structurally ordered YCo₂(111) surface. While no clear spin-asymmetry was observed for bulk sensitive SRPES data taken at hν=1253.6eV, the surface sensitive SRPES data obtained at hν=21.2eV photon energy revealed a clear spin-asymmetry probing the validity of the recent theoretical prediction [1].

[1] S. Khmelevskyi, P. Mohn, J. Redinger, and M. Weinert, Phys. Rev. Lett. 94, 146403 (2005).