Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetic Thin Films I
MA 15.8: Vortrag
Dienstag, 26. Februar 2008, 12:15–12:30, H 1012
Reorientation transition in Fe/Pt multilayers studied by means of depth-selective x-ray magnetic dichroism — •Nora Darowski, Enrico Schierle, Hermann Rossner, Detlef Schmitz, and Eugen Weschke — Hahn-Meitner-Institute, Berlin, Germany
The reorientation transition from in-plane magnetization of a Pt/Fe/Pt trilayer to perpendicular magnetic anisotropy in the L10 ordered FePt structure has been investigated. The FePt system is of considerable research interest due to its large magnetic anisotropy. The transformation at 350 ∘C of the disordered fcc phase to the ordered face-centred tetragonal L10 phase has been attributed to be the reason for the high pependicular magnetic anisotropy. Recently, Mössbauer spectroscopy indicated an exchange coupling between hard magnetic L10 and soft magnetic fcc phase during the reorientation transition including an out-of-plane rotation of the magnetization of the fcc phase proir to formation of L10 phase. X-ray magnetic circular dichroism (XMCD) was used to elucidate the phase formation and for characterization of the magnetic properties, such as spin and orbital moments of the 2 nm thin Fe film. Soft x-ray standing waves produced by a multilayer interference substrate were used to add depth selectivity to the L-edge XMCD. Wis this method we were able to determine the magnetic properties with a depth resolution better than 1 nm.