Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.27: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Interfacial magnetic domain coupling study in single-cristalline Fe/CoO bilayers — •Jorge Miguel1, Radu M. Abrudan1,2, Matthias Bernien1, Marten Piantek1, Carsten Tieg2, Jürgen Kirschner2, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany — 2Max-Planck-Institut für Mikrostruktur, Weinberg 2, D-06120 Halle, Germany
X-ray absorption spectroscopy and spectromicroscopy were employed to probe the magnetic and electronic properties of Fe/CoO bilayers with elemental selectivity. The use of a photoelectron emission microscope (PEEM) in connection with x-ray magnetic circular and linear dichroisms (XMCD and XMLD) allows the layer-selective imaging of ferromagnetic (FM) and antiferromagnetic (AFM) domains. Absorption spectra taken from bilayers with different Fe thicknesses show only a weak indication for the formation of Fe oxide at the Fe/CoO interface, and a parallel coupling between the Fe magnetization and the CoO spin axis. XMCD- and XMLD-PEEM images were used to laterally probe both magnetic layers. A magnetic coupling between the layers can be deduced by comparing the magnetic domains in Fe and CoO. In addition to the AFM domains in CoO, which are imaged by XMLD, XMCD images at the Co L2,3 edges yield a magnetic contrast due to induced magnetic moments. A perfect overlap in the domain walls of the Fe and CoO layers is observed. Furthermore, Fe layers with thicknesses below the onset of ferromagnetism have an effect on the size of the CoO AFM domains.