Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Focus: Magnetism as seen by neutrons

MA 14.3: Hauptvortrag

Dienstag, 8. März 2016, 10:45–11:15, H32

Magnetism at heterostructures and interfaces — Jochen Mannhart and •Hans Boschker — Max Planck Institute for Solid State Research, Heisenbergstrasse 1. 70569 Stuttgart, Germany

Two oxide magnetic heterostructures will be discussed. First is the interface of La0.67Sr0.33MnO3 (LSMO) and SrTiO3 (STO). Using magnetic depth profiling with polarized neutron reflectometry, we show that convential LSMO-STO interfaces have a magnetic dead layer. In contrast, interface engineered LSMO-STO interfaces, where the polar discontinuity has been removed by locally adjusting the LSMO composition, do no have a dead layer. As magnetic devices depend on the magnetization at the interface, the interface engineered heterostructures should improve device performance. The second material is atomically thin SrRuO3. Atomically thin ferromagnetic and conducting electron systems are highly desired for spintronics because they can be controlled with both magnetic and electric fields. We present (SrRuO3)1-(SrTiO3)5 superlattices of exceptional quality. In these superlattices the electron system comprises only a single RuO2 plane. We observe conductivity down to 50 mK and a ferromagnetic state with a Curie temperature of at least 30 K and signals of magnetism in magnetotransport persisting up to approximately 100 K.