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 28.80: Poster
Mittwoch, 10. März 2004, 16:00–19:00, Bereich C
Faraday rotation spectrum at shallow core levels: 3p edges of Fe, Co, and Ni — •Sergio Valencia1, Hans-Christoph Mertins2, Peter M. Oppeneer3, Dirk Abramsohn1, Andreas Gaupp1, Claus M. Schneider4, and Wolfgang Gudat1 — 1BESSY, Berlin — 2FH Münster — 3IFW Dresden — 4IFF, FZ Jülich
We report measurements of the Faraday effect at the 3p edges of thin Fe, Co, and Ni films. The Faraday rotation and ellipticity are determined by a complete polarization analysis of the synchrotron radiation transmitted across the samples. Surprisingly, the rotation constants k attain large values comparable to those observed at the 2p edges. Maximal rotation constants of 2.2 · 105, 1.5 · 105, and 0.8 · 105 deg/mm are found for Fe, Co, and Ni, respectively. While at the 2p edges the spin-orbit splitting of the 2p levels is considered to be mainly responsible for the magneto-optical effects, the unexpected similarity underlines the role of the exchange-splitting of the 3p core levels in the extreme ultra-violet region (EUV). A full set of optical and magneto-optical constants, which were determined from the measured rotation and ellipticity, are presented for the three elements in the energy range of the 3p edges.