Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)

O 28.78: Poster

Mittwoch, 10. März 2004, 16:00–19:00, Bereich C

X-ray longitudinal Kerr rotation and ellipticity spectra measured at the 2p edges of Fe, Co, and Ni — •Sergio Valencia¹, Hans-Christoph Mertins¹, Peter M. Oppeneer², Dirk Abramsohn¹, Andreas Gaupp¹, and Wolfgang Gudat¹ — ¹BESSY, Berlin — ²IFW Dresden

The first measurements of the X-ray longitudinal magneto-optical Kerr effect (L-MOKE) at the 2p absorption edges of amorphous Fe, Co, and Ni films are reported. The L-MOKE rotation and ellipticity spectra are recorded by a complete polarization analysis of the X-rays reflected from the ferromagnetic surface. At the edges large Kerr rotations of up to ±24^∘ are detected, which are more than two orders of magnitude larger than those in the visible energy range. Using a numerical simulation package based on the magneto-optical refractive indices, the spectral contributions stemming from magneto-optically active atomic transitions could be seperated from layer interference effects. Both theoretically and experimentally it is shown that at grazing incidence the longitudinal Kerr rotation and Kerr ellipticity are proportional to the transversal MOKE and the XMCD reflection spectrum, respectively.