Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Magnetic Textures: Statics and Imaging I

MA 7.2: Vortrag

Montag, 1. April 2019, 15:30–15:45, H37

Magnetic exchange interaction at the Fe/Ir(111) interface — •Sergey Tsurkan and Khalil Zakeri Lori — Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany

The magnetic ground state of the Fe monolayer on Ir(111) has been observed to be a spontaneous skyrmion lattice. The formation of such an exotic ground state is attributed to the interplay between the Heisenberg exchange, four spin and Dzyaloshinskii-Moriya interaction [1]. However, these fundamental magnetic interactions in this system have not been measured quantitatively. In order to quantify these interactions we performed spin-polarized high resolution electron energy-loss spectroscopy experiments on a trilayer structure consisting of Co/Co/Fe epitaxially grown on Ir(111). By probing the magnon dispersion relation across the surface Brillouin zone we quantified the interfacial exchange interaction at the Fe/Ir(111) interface. Our results indicate that the Heisenberg exchange interaction in the interface Fe layer is very weak and exhibits a rather complex pattern. Such a weak exchange interaction in the presence of the Dzyaloshinskii-Moriya interaction would allow for the formation of the skyrmionic ground state. [1] S. Heinze, et al., Nature Physics 7, 713 (2011).
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.