Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.73: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Influence of layer thickness on exchange-spring behavior of SrRuO₃-La_0.7Sr_0.3MnO₃ bilayers — •Martin Michael Koch, Lukas Bergmann, Aurora Diana Rata, and Kathrin Dörr — Martin-Luther-Universität Halle-Wittenberg, Deutschland

Thin epitaxial bilayers of SrRuO₃/La_0.7Sr_0.3MnO₃ on SrTiO₃(001) substrates have been suggested to form an exchange spring in SrRuO₃ at the interface where strong antiferromagnetic exchange coupling with the adjacent manganite layer is present. We analyze temperature- and field-dependent magnetization data in sample series of systematically varied layer thicknesses of both components grown by pulsed laser deposition on TiO₂-terminated substrates. Magnetic switching of such bilayers is strongly different from that of a conventional exchange-bias-coupled bilayer. A model of the interfacial spin structure is suggested as a vertical Bloch wall with gradually increasing out-of-plane spin canting, with in-plane magnetic easy axes at the interface and strained-bulk-like SrRuO₃ characteristics in sufficient distance from the interface. Results indicate a maximum extension of the exchange spring of about 10 unit cells (4 nm) into the SrRuO₃ layer. We discuss the impact of such interfacial spin textures on magnetic switching as well as on further properties which are important for spintronics applications.