Nanomorphology Effects in Semiconductors with Native Ferromagnetism : Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition
| Autor: | Philipp Erler, Bastian Trepka, Mikhail Fonin, Axel Lubk, Ulrich Nowak, Klaus Boldt, Sebastian Polarz, Daniel Wolf, Severin Selzer, Tom Kollek |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nanostructure
Materials science Magnetism Mechanical Engineering Inorganic chemistry Oxide chemistry.chemical_element Nanoparticle 02 engineering and technology Magnetic semiconductor 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Ferromagnetism Mechanics of Materials Quantum dot Chemical physics General Materials Science ddc:530 0210 nano-technology Europium |
| Zdroj: | Advanced Materials |
| Popis: | 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. published |
| Databáze: | OpenAIRE |
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