Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and nanostructured magnetic materials
MA 39.2: Vortrag
Donnerstag, 15. März 2018, 09:45–10:00, H 0112
Magnetic Behavior of EuO Tubes Prepared via a Topotactic Nanostructure Transition — •Severin Selzer1, Bastian Trepka1, Philipp Erler1, Tom Kollek1, Klaus Boldt1, Mikhail Fonin1, Daniel Wolf2, Axel Lubk2, Sebastian Polarz1, and Ulrich Nowak1 — 1Universität Konstanz, Universitätstraße 10, D-78457 Konstanz — 2IFW Dresden e.V., Helmholtzstraße 20, D-01069 Dresden
Being one of the few native ferromagnetic semiconductors, europium(II)oxide offers a great potential for the realization of spintronic devices. However, due to its reducing nature no reliable routes for EuO nanoparticle synthesis can be established. Instead of targeting a direct synthesis, the two steps – structure control and chemical transformation – are separated. The generation of a transitional, hybrid nanophase is followed by its conversion into EuO under full conservation of all morphological features.
Via this route EuO nanoparticles with tubular character and lamellar structure are now accessible. This special structure has a large impact on the key magnetic properties of these nanotubes. For a single layer of these tubes magnetic vortex or onion states have been found. Stacked to a tube, these layers couple antiferromagnetically in order to reduce their stray-fields. Owing to thermally activated transitions between these states an unexpected temperature dependence emerges (Trepka et al., Adv. Mater. 2017, 1703612).
Financial support by the DFG within SFB1214 is gratefully acknowledged.