SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.9: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Influence of lattice strain on possible skyrmions in SrRuO₃-based oxide heterostructures — •Robert Gruhl, Ludwig Scheuchenpflug, and Philipp Gegenwart — Experimentalphysik VI, Universität Augsburg, 86159 Augsburg, Germany

Dzyaloshinskii-Moriya interaction can lead to the formation of skyrmions in crystal lattices with a broken inversion symmetry, as it is the case at interfaces of artificial heterostructures. Néel-type skyrmions were proposed to form in bilayers of ferromagnetic SrRuO₃ and paramagnetic SrIrO₃ with strong spin-orbit coupling as indicated by the observation of a topological hall effect [1].

Heterostructures of SrRuO₃ and SrIrO₃ on SrTiO₃ substrates show a rather bad structural compatibility due to the large lattice mismatch of about 1.1 % between SrIrO₃ and the substrate. To address this, we reduced the lattice constant of the iridate by doping it with calcium. Superlattices composed of [SrRuO₃]₅/[Ca_xSr_1−xIrO₃]₂ with various levels of doping were grown on STO (001) substrates by the means of metal-organic aerosol deposition. The structural properties of the samples were studied by x-ray diffraction, reciprocal space mapping and TEM imaging. Hall measurements were carried out to search for topological contributions as an indication for the formation of skyrmions and compared with the results of [1,2].

[1] J. Matsuno et al., Science Adv. 2 (2016) e1600304.

[2] S. Esser et al., Phys. Rev. B 103 (2021) 214430.