Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Magnetic Thin Films II
MA 21.17: Vortrag
Mittwoch, 27. Februar 2008, 18:15–18:30, H 1012
Influence of ligand states on the relationship between orbital moment and magneto-crystalline anisotropy — Cecilia Andersson1, Biplab Sanyal1, Olle Eriksson1, Lars Nordstrom1, Olof Karis1, •Dimitri Arvanitis1, Takehisa Konishi2, Elizabeta Holub-Krappe3, and Jonathan Hunter Dunn4 — 1Uppsala University, Uppsala, Sweden — 2Chiba University, Chiba, Japan — 3Hahn-Meitner Institut, Berlin, Germany — 4MAX-lab, Lund University, Lund, Sweden
We investigate the spin reorientation in Au/Co/Au trilayers, grown on a W(110) single crystal, using X-ray magnetic circular dichroism (XMCD) in situ. We investigate also an ex situ grown Au/Co/Au sample where the spin reorientation is induced upon cooling. The spin and orbital moments of these Au/Co/Au trilayers are obtained by means of the XMCD sum rules both for an in- and an out-of-plane magnetization. Our findings suggest that the orbital moment of Co does not obtain a maximum value along the easy axis, in contrast to previous experience. This is attributed to the large spin-orbit interaction within the Au caps. Both second order perturbation theory and first principles calculations show that the magneto-crystalline anisotropy (MCA) is influenced by this effect, and that this can lead to that the orbital moment anisotropy is not proportional to the MCA [1]. [1] C. Andersson et al., Phys. Rev. Lett. 99, 177207 (2007).