Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Magnetic Thin Films II
MA 21.18: Vortrag
Mittwoch, 27. Februar 2008, 18:30–18:45, H 1012
Co L-edge EXAFS analysis of Au/Co/Au/W(110) magnetic thin films — •Masako Sakamaki1, Cecilia Andersson2, Takehisa Konishi1, Takashi Fujikawa1, Elizabeta Holub-Krappe3, Hermann Rossner3, Olof Karis2, Andreas Persson2, and Dimitri Arvanitis2 — 1Chiba University, Chiba, Japan — 2Uppsala University, Uppsala, Sweden — 3Hahn-Meitner Institut, Berlin, Germany
Ultrathin Au/Co/Au is known as a prototypical system which shows perpendicular magnetic anisotropy. Our recent XMCD study of in-situ prepared Au/Co/Au/W(110) showed that, contrary to the widely accepted picture, there is no increase of the Co perpendicular orbital moment that accompanies the in-plane to out-of-plane spin reorientaton transition(SRT)[1]. We performed an in-situ Co L-edge Extended X-ray Absorption Fine Structure (EXAFS) study of the local structure on the same samples whose magnetic properties were characterized using XMCD and X-ray resonant reflectivity. We applied the Bayes-Turchin approach developed by Krappe and Rossner[2, 3] in analyzing the EXAFS spectra. From this analysis, we obtain quantitative information about the structural strain and disorder of the Co layers. We discuss the role of the local structural modifications among the mechanisms responsible for the occurence of the SRT. [1] C. Andersson et al., Phys. Rev. Lett. 99, 177207 (2007). [2] H. J. Krappe and H. H. Rossner, Phys. Rev. B 70, 104102 (2004). [3] H. H. Rossner, D. Schmitz, P. Imperia, H. J. Krappe, J. J. Rehr, Phys. Rev. B 74, 134107(2006).