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

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Advanced Materials. 2018, 30(1), 1703612. ISSN 0935-9648. eISSN 1521-4095. Available under: doi: 10.1002/adma.201703612
Zusammenfassung

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.

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ISO 690TREPKA, Bastian, Philipp ERLER, Severin SELZER, Tom KOLLEK, Klaus BOLDT, Mikhail FONIN, Ulrich NOWAK, Daniel WOLF, Axel LUBK, Sebastian POLARZ, 2018. Nanomorphology Effects in Semiconductors with Native Ferromagnetism : Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition. In: Advanced Materials. 2018, 30(1), 1703612. ISSN 0935-9648. eISSN 1521-4095. Available under: doi: 10.1002/adma.201703612
BibTex
@article{Trepka2018-01Nanom-40796,
  year={2018},
  doi={10.1002/adma.201703612},
  title={Nanomorphology Effects in Semiconductors with Native Ferromagnetism : Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition},
  number={1},
  volume={30},
  issn={0935-9648},
  journal={Advanced Materials},
  author={Trepka, Bastian and Erler, Philipp and Selzer, Severin and Kollek, Tom and Boldt, Klaus and Fonin, Mikhail and Nowak, Ulrich and Wolf, Daniel and Lubk, Axel and Polarz, Sebastian},
  note={Article Number: 1703612}
}
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