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MA: Fachverband Magnetismus
MA 27: Magnetic Thin Films II of 2
MA 27.6: Talk
Wednesday, March 13, 2013, 16:30–16:45, H3
Magnetization profile across bcc Fe films as seen by x-ray resonant magnetic reflectivity — •Emmanuelle Jal1, Jean-Marc Tonnerre1, Maciej Dabrowski2, Marek Przybylski2,3, and Jürgen Kirschner2,4 — 1Institut Néel, CNRS and UJF, Grenoble, France — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 3Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland — 4Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
Any modification in electronic states occupation and lower atomic coordination at the surface/interface resulting in band narrowing changes the surface magnetic moment. Since the magnetometric methods are integral and feature no spatial resolution, they cannot be used for local investigations. However, the magnetic moment can be taken as a parameter influencing diffraction or reflectivity that can be either probed with neutrons or polarized x-ray at the absorption edge. Therefore, we investigate the Au/Fe(13.5 and 5.9ML)/Ag(1,1,6) as well as on Au/Fe(13ML)/Ag(001), by soft x-ray resonant magnetic reflectivity (SXRMR) at the Fe L3 edge. At T=20K we observe 30% enhancement of the Fe magnetic moment with respect to the bulk value, located within 2-3ML of Fe (the spatial resolution of our method) at both Au/Fe and Fe/Ag interfaces. This increase in the very interface region is in agreement with theoretical findings. The comparison of the calculated value averaged for the first three layers is in a good agreement with 2.7µB, observed in our experiment.