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  Sakamaki, M.; Andersson, C.; Konishi, T.; Fujikawa, T.; Holub-Krappe, E.; Rossner, H.; Krappe, H.; Karis, O.; Persson, A.; Arvanitis, D.: Co L-edge EXAFS analysis of Au/Co/Au magnetic thin films. In: Proceedings of the 11th Meeting of the Japanese XAFS Society, Egret Himeji, Japan, 6-9 August 2008, 2008, p. 45-46

Abstract:
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 Xray 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).