Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Spin Torque and Spin Excitations II
MA 44.4: Vortrag
Donnerstag, 3. April 2014, 15:45–16:00, HSZ 403
Magnetic excitations in ultrathin Co films on Ir(100) — •Ying-Jiun Chen1, Khalil Zakeri1, Arthur Ernst1,3, Huajun Qin1, Tzu-Hung Chuang1, Yang Meng1, and Jürgen Kirschner1,2 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — 3Wilhelm Ostwald Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, 04103 Leipzig, Germany
We report on the experimental results of high-energy magnetic excitations in an ultrathin face-centered tetragonal (fct) Co film with a thickness of 2.8 monolayer (ML) grown on the (5×1) reconstructed Ir(100) surface. The magnon dispersion relation is measured along the main symmetry axes of the sureface Brillouin zone i.e. Γ-X and Γ-M directions. The excitation energy increases as the wave-vector increases and reaches a value of about 260 meV at the X-point and 310 meV at the M-point. By comparing the results to the ones of a 3 ML Co film grown on Cu(100), and also to the results of theoretical calculations, we discuss how the lattice strain and Co3d-Ir5d hybridizations of the electronic states influence the magnon dispersion relation.