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 28.85: Poster

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

X-ray resonant magnetic scattering of Fe/Cr superlattices — •Alexei Nefedov, Johannes Grabis, Andre Bergmann, Florin Radu, and Hartmut Zabel — Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

We have studied the magnetic and structural properties of an antiferromagnetically (AF) coupled Fe/Cr(001) superlattice by soft X-ray resonant magnetic scattering. Strong magnetic Bragg peaks are observed at the half order positions in reciprocal space parallel to the [001] growth direction and in between the structural Bragg reflections from the superlattice periodicity. The magnetic hysteresis loops measured at the structural Bragg peak and at the half-order peak clearly demonstrate the AF coupling of the Fe/Cr multilayer. Transverse scans and off-specular reflectivity measurements confirm an AF domain structure of the superlattice in remanence with large perpendicular correlation. In addition, the transverse scan of the half-order Bragg peak exhibits a Lorentzian line shape at zero field, which diminishes in higher fields, indicative for a remanent multidomain state which approaches a single domain state towards saturation.

This work was supported by the German Federal Ministry of Education and Research (BMBF) under Contract No.03ZAE7BO.