Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.1: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Topological Hall effect in asymmetric all-oxide perovskite superlattices? — •Lena Wysocki, Jörg Schöpf, Ramil Mirzaagheyev, Rolf Versteeg, Paul H. M. van Loosdrecht, and Ionela Lindfors-Vrejoiu — Universität zu Köln, II. Physikalisches Institut

Interactions at coherent interfaces in all-oxide superlattices may result in spectacular physical effects. The presence of interfacial Dzyaloshinskii-Moriya interaction at the interface between a ferromagnetic oxide layer and a heavy 5d metal oxide may generates chiral magnetic order in the ferromagnetic layers, possibly even leading to a skyrmionic phase. Here we study the effects of interfacing a ferromagnetic 4d transition metal oxide, SrRuO3, with non-magnetic insulating 4d and 5d transition metal oxides. Asymmetric superlattices combining SrRuO3 and 5d perovskite oxides were grown by pulsed-laser deposition and studied by SQUID magnetization, magneto-optical Kerr effect, and Hall effect experiments. The Hall resistivity measurements of the superlattices showed, besides the usual ordinary and anomalous contributions, a clear contribution hinting to the occurrence of a topological Hall effect, and hence to the occurrence of topological magnetic textures in the SrRuO3 layers. These results open the gateway to engineered all-oxide heterostructures hosting non-trivial magnetic structures such as skyrmions.