Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 26: Thin Films: Magnetic Coupling Phenomena / Exchange Bias

MA 26.4: Vortrag

Dienstag, 21. März 2017, 14:45–15:00, HSZ 101

Topological Hall effect in antiferromagnetically coupled SrRuO3/La0.7Sr0.3MnO3 epitaxial heterostructures — •Ionela Lindfors-Vrejoiu¹ and Michael Ziese² — ¹II. Physikalisches Institut, Universität zu Köln, D-50937 Köln, Germany — ²Institut für Experimentelle Physik II, Universität Leipzig, D-04103 Leipzig, Germany

The physical properties of epitaxial heterostructures and superlattices often show crucial differences to those of bulk compounds. Heterostructures of two prototypical ferromagnetic oxides, SrRuO3 and La0.7Sr0.3MnO3, exhibit a variety of novel intriguing phenomena, including the manifestation of a topological Hall effect. The novel features originate from the very different magneto-crystalline anisotropies of the two ferromagnets when grown as epitaxial layers, from an antiferromagnetic interlayer coupling that occurs via Mn-O-Ru bonds at the interfaces, and from the oxygen octahedral connectivity across the epitaxially coherent interfaces. The interplay between these results in a strongly non-collinear ordering of the Ru and Mn magnetic moments in the individual layers, which leads to the occurrence of a topological Hall effect.