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MA: Fachverband Magnetismus

MA 41: Surface magnetism I

MA 41.3: Talk

Thursday, March 15, 2018, 10:00–10:15, EB 202

Layer-specific magnetic excitations in Fe/Co multilayers — •Sergey Tsurkan, Huajun Qin, and Khalil Zakeri Lori — Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany

We investigate the terahertz magnetic excitations in multilayers of Feand Co epitaxially grown on W(110). The experiments were performed by means of spin-polarized high-resolution electron energy-loss spectroscopy. Different magnon modes were observed and assigned to the excitations localized in different layers. We discuss the origin of the observed magnon modes based on a simple Heisenberg model. The model indicates that the Heisenberg exchange constants are strongly layer dependent. By probing the dispersion relation of these magnon modes over the surface Brillouin zone we quantify the strength of the exchange interaction in different layers [1]. Finally we address the effect of the Dzyaloshinskii–Moriya interaction on the observed magnon modes. [1] Zakeri, J. Phys. Condens. Matter 29, 013001 (2017). The work has been supported by the Deutsche Forschungsgemeinschaft (DFG) through the Heisenberg Programme ZA 902/3-1 and the DFG grant ZA 902/4-1.