Regensburg 2019 – wissenschaftliches Programm
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 . 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.  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.