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Trepka B, Erler P, Selzer S, et al. Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition. Adv Mater. 2017;30(1)doi: 10.1002/adma.201703612.
Trepka, B., Erler, P., Selzer, S., Kollek, T., Boldt, K., Fonin, M., Nowak, U., Wolf, D., Lubk, A., & Polarz, S. (2018). Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition. Advanced materials (Deerfield Beach, Fla.), 30(1), . https://doi.org/10.1002/adma.201703612
Trepka, Bastian, et al. "Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition." Advanced materials (Deerfield Beach, Fla.) vol. 30,1 (2018). doi: https://doi.org/10.1002/adma.201703612
Trepka B, Erler P, Selzer S, Kollek T, Boldt K, Fonin M, Nowak U, Wolf D, Lubk A, Polarz S. Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition. Adv Mater. 2018 Jan;30(1). doi: 10.1002/adma.201703612. Epub 2017 Nov 20. PMID: 29152806.
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Adv Mater. 2018 Jan;30(1). doi: 10.1002/adma.201703612. Epub 2017 Nov 20.

Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition.

Advanced materials (Deerfield Beach, Fla.)

Bastian Trepka, Philipp Erler, Severin Selzer, Tom Kollek, Klaus Boldt, Mikhail Fonin, Ulrich Nowak, Daniel Wolf, Axel Lubk, Sebastian Polarz

Affiliations

  1. Department of Chemistry, University of Konstanz, Universitaetsstrasse 10, D-78457, Konstanz, Germany.
  2. Department of Physics, University of Konstanz, Universitaetsstrasse 10, D-78457, Konstanz, Germany.
  3. IFW Dresden e.V., Helmholtzstraße 20, D-01069, Dresden, Germany.

PMID: 29152806 DOI: 10.1002/adma.201703612

Abstract

Semiconductors with native ferromagnetism barely exist and defined nanostructures are almost unknown. This lack impedes the exploration of a new class of materials characterized by a direct combination of effects on the electronic system caused by quantum confinement effects with magnetism. A good example is EuO for which currently no reliable routes for nanoparticle synthesis can be established. Bottom-up approaches applicable to other oxides fail because of the labile oxidation state +II. 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. Hierarchical EuO materials are now accessible in the shape of oriented nanodisks stacked to tubular particles. Magnetically, the coupling of either vortex or onion states has been found. An unexpected temperature dependence is governed by thermally activated transitions between these states.

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: hollow nanostructures; magnetic semiconductors; nonaqueous sol-gel process; shape-property relationships; vortex magnetism

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