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MA: Fachverband Magnetismus

MA 54: Spin Hall Effects and Skyrmions II

MA 54.7: Vortrag

Donnerstag, 23. März 2017, 16:45–17:00, HSZ 04

Hydrogen-Induced Skyrmions in Ultrathin Iron Films — •Pin-Jui Hsu, Lorenz Schimdt, Aurore Finco, Niklas Romming, Andre' Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

Chiral magnetic states, such as chiral domain walls, spin spirals, and magnetic skyrmions, have recently been observed in magnetic films on heavy metal substrates due to a sizable interfacial Dzyaloshinskii-Moriya (DM) interaction and a lack of spatial inversion symmetry at surfaces and interfaces. In the present work, we report on the emergence of individual magnetic skyrmions by dosing atomic hydrogen onto Fe double-layers (Fe-DL) grown on Ir(111). A spin spiral ground state was recently found for clean pseudomorphic Fe-DL with a rather short period of about 1.3 nm, which remains stable up to 9 T out-of-plane field without transition to a skyrmionic state [1]. After introducing atomic hydrogen, the pseudomorphic strained Fe-DL exhibits a p(2x2)-structure and a spin spiral ground state in zero field with an increased periodicity of up to 4.0 nm. Upon application of an external out-of-plane magnetic field, isolated magnetic skyrmions appear on the hydrogenated Fe-DL as directly observed by in-situ SP-STM measurements. Hydrogenation of magnetic thin films therefore appears as an interesting alternative for tuning the properties of chiral non-collinear spin textures, besides magnetic multilayer technologies.[1] P.-J. Hsu, A. Finco, L. Schmidt, A. Kubetzka, K. v. Bergmann, R. Wiesendanger, Phys. Rev. Lett. 116, 017201 (2016)