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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-La0.7Sr0.3MnO3 bilayers — •Martin Michael Koch, Lukas Bergmann, Aurora Diana Rata, and Kathrin Dörr — Martin-Luther-Universität Halle-Wittenberg, Deutschland

Thin epitaxial bilayers of SrRuO3/La0.7Sr0.3MnO3 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.

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