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MA: Fachverband Magnetismus
MA 9: Spin Excitations/Spin Torque
MA 9.11: Vortrag
Montag, 16. März 2015, 18:15–18:30, H 0112
Magnetic excitations in Co films on Ir(001) and Rh(001) substrates: The role of interfacial electronic hybridization — •Ying-Jiun Chen1, Khalil Zakeri Lori1, Arthur Ernst1, 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
The hybridization between the electronic states of an ultrathin magnetic film and the substrate is a notable effect, which modifies the magnetic properties of the film. In order to address this effect we have investigated the magnetic properties and high-energy magnetic excitations in ultrathin Co films, with a thickness of 1-2 monolayer (ML), grown on Ir(001) and Rh(001). The magneto-optical Kerr effect measurements revealed that the magnetic easy axis for both systems is lying in the film plane. It was found that the in-plane magnetic anisotropy energy of the Co films grown on the Ir(001) surface is rather large, compared to the one of the Co films on Rh(001). The high-energy magnetic excitations were investigated by means of spin-polarized electron energy loss spectroscopy. It was observed that the magnon dispersion relation for both Co/Ir(001) and Co/Rh(001) systems is nearly the same. Combined with first-principles calculations, we discuss how the interfacial hybridization of the Co3d-Ir5d and Co3d-Rh4d electronic states influences the magnetic anisotropy energy and high-energy magnetic excitations in these systems.