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SYRN: From quantisation in the gravitational field to correlated electron systems - Perspectives of research with neutrons

SYRN 1: Perspectives of research with neutrons

SYRN 1.3: Hauptvortrag

Dienstag, 8. März 2005, 15:00–15:30, TU HE101

Magnetic Nanostructures — •H. Zabel, K. Theis-Bröhl, F. Radu, and M. Wolff — Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

The current interest in magnetic nanostructures is driven by their manifold applications in the magneto- and spin-electronic area. Polarized neutron reflectivity (PNR) studies provide a layer resolved vector magnetometry, even for deeply buried layers. This feature is essential for the analysis of the magnetization reversal mechanism in ferro- /antiferromagnetic heterostructures exhibiting the exchange bias effect¹, as well as for modelling magnetic superlattices with biquadratic interlayer exchange coupling². Furthermore diffusely scattered neutrons have shown new directions for analysing magnetic domains and domain wall distributions in thin films. Periodic arrays of magnetic stripes and islands is a new and intriguing topic. PNR is highly suitable for studying different remagnetization processes in these patterns, as it can distinguish between reversals via coherent rotation or domain nucleation and wall movement. Bragg peaks from the lateral periodicity offer the possibility to filter out correlation effects between individual magnetic units³. After introducing the PNR method, a number of recent studies on magnetic heterostructures and lateral nanostructures will be discussed. - We gratefully acknowledge support from BMBF 03ZA6BC1 and SFB 491: Magnetic Heterostructures.
1. F. Radu et al. Phys. Rev. B 67, 134409 (2003).
2. V. Lauter-Pasyuk et al., Phys. Rev. Lett. 89, 167203 (2002).
3. K. Theis-Bröhl et al., Phys. Rev. B 68, 184415 (2003).