Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Surface magnetism I

MA 41.7: Vortrag

Donnerstag, 15. März 2018, 11:15–11:30, EB 202

Hot electrons interacting with non-collinear surface spins — •Anika Schlenhoff, Stefan Krause, and Roland Wiesendanger — Department of Physics, University of Hamburg (Germany)

Understanding the interactions of hot electrons with localized spins is an important prerequisite for the development of spintronic applications. An ideal model system to investigate these interactions are image-potential states (IPS) forming a Rydberg-like series of unoccupied exchange-split states in front of a magnetic surface. While IPS on ferromagnetic systems have been investigated [1,2], their electronic structure on non-collinear magnets is yet not explored.

In our experiments, we use a spin-polarized scannning tunneling microscope (SP-STM) in the field emission mode to locally investigate IPS above non-collinear spin textures. Our studies on the double layer (DL) Fe/W(110) spin spiral, the DL Fe/Ir(111) spin spiral and the monolayer Fe/Ir(111) nano-skyrmion lattice reveal the IPS exhibiting the local spin quantization axis of the underlying surface, rotating on the lateral atomic-scale. High-order IPS located 10 nm away from the surface still reflect the non-collinear spin texture, allowing for atomic-scale magnetic imaging at unprecedented large tip-sample distances. Our experiments indicate that the exchange-correlations between hot electrons with about 20 eV and bulk electrons in non-collinear thin-film magnets are governed by the interplay of Heisenberg exchange, Dzyaloshinskii-Moriya, spin-orbit and four-spin interaction.
 M. Donath et al., Surf. Sci. 601, 5701 (2007).
 A. Schlenhoff et al., Phys. Rev. Lett. 109, 097602 (2012).