Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 31: Surface and Interface Magnetism I (jointly with MA)

O 31.7: Talk

Tuesday, March 12, 2013, 12:00–12:15, H33

Anisotropic charge oscillations induced by non-magnetic impurities on Fe/W(001) — •Mohammed Bouhassoune, Bernd Zimmermann, Phivos Mavropoulos, Daniel Wortmann, Peter H. Dederichs, Stefan Blügel, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

It has been shown recently that impurities embedded in the surface of few monolayers of Fe deposited on W(001) can trigger intriguing anisotropic charge oscillations [1]. This behavior exhibits a strong dependence on the thickness of the Fe film. Combining first-principles methods: the full-potential linearized augmented plane waves method [2] and the full-potential Korringa-Kohn-Rostoker Green function method [2], we investigate this peculiar behavior by considering single oxygen impurities and find that the anisotropic focused charge oscillations are substantially spin-dependent and are only present when the thickness of the Fe film equals 3 monolayers. We relate this effect to spin-dependent features of the two-dimensional Fermi contours that are crucially affected by the thickness of Fe films.

This work is supported by the HGF-YIG Programme FunSiLab –Functional Nanoscale Structure Probe and Simulation Laboratory (VH-NG-717).

[1] K. Von Bergmann, PhD Thesis, University of Hamburg (2004)

[2] www.juDFT.de