Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Micro- and Nanostructured Magnetic Materials III

MA 36.1: Vortrag

Mittwoch, 16. März 2011, 14:45–15:00, HSZ 103

Magnetic correlations in laterally patterned antiferromagnetically coupled Fe/Cr multilayers — •Markus Schmitz, Alexander Weber, Elisabeth Josten, Ulrich Rücker, and Thomas Brückel — IFF-Streumethoden, Forschungszentrum Jülich, 52425 Jülich

Patterned magnetic structures are the basic elements of spintronic devices. The ongoing miniaturization makes the influence of neighboring structures more and more important. Fe/Cr multilayers have been grown epitaxially on GaAs (100) single crystals by Molecular Beam Epitaxy. The Cr interlayers induce an antiferromagnetic coupling between adjacent Fe layers. Thus, the magnetic dipole moment is reduced and a magnetic superstructure is created, which is, due to the contrast of Cr to Fe, easily observable by polarized neutron reflectometry. The lateral structuring was performed by UV-nanoimprint lithography and Reactive Ion Etching. The structural characterization was carried out by Scanning Electron Microscopy, Atomic Force Microscopy and X-ray scattering under grazing incidence. The macroscopic magnetic properties were determined by MOKE and SQUID magnetometry. Polarized neutron reflectometry and off-specular scattering was used to determine the magnetic domain formation within the individual layers. The work presented gives insight into the interplay of shape and crystal anisotropy within the individual layers and patterns.