Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Magnetic Thin Films II of 2
MA 27.4: Vortrag
Mittwoch, 13. März 2013, 15:45–16:00, H3
Magneto-crystalline anisotropy detected by X-ray magnetic linear dichroism at the 3p edge of Fe: First experiments and theory — •Marc Tesch1, Markus Gilbert1, Hans-Christoph Mertins1, Andreas Gaupp2, Dominik Legut3, Peter Oppeneer4, Daniel Bürgler5, and Claus Schneider5,6 — 1FH Münster, Stegerwaldstr. 39, D-48565 Steinfurt — 2HZB, Albert Einstein Str. 15, D-12489 Berlin — 3Nanotechnology Centre, Ostrava, Czech Republic — 4Depart. of Physics, Uppsala Uni., Box 530, S-751 21 Uppsala, Sweden — 5FZ Jülich GmbH, PGI-6, D-52425 Jülich — 6Fakultät f. Physik and CeNIDE, Uni Duisburg-Essen, D-47048 Duisburg
We present first experimental results of magneto-crystalline anisotropy detected on single crystalline bcc Fe films at the 3p edge by X-ray magnetic linear dichroism (XMLD) measurements using linearly polarized undulator radiation at BESSY. We found a strong dependence of the XMLD signal on the orientation of the crystal axes, i.e. the magnetic hard and easy axes, with respect to the polarization vector of the light. The extension of measurements of the magneto-crystalline anisotropy from the 2p to the 3p edge completes the understanding of underlying effects, in particular concerning the role of the exchange splitting. While it can often be neglected in calculations for the 2p edge with large spin-orbit splitting it must be considered at the 3p edge, where exchange splitting and spin-orbit splitting are of the same order of magnitude. The experimental results are compared with our ab initio calculations to distinguish between competing models of the electronic band structure.