Details
| Original language | English |
|---|---|
| Article number | 1703612 |
| Journal | Advanced materials |
| Volume | 30 |
| Issue number | 1 |
| Publication status | Published - 20 Jan 2018 |
| Externally published | Yes |
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.
Keywords
- hollow nanostructures, magnetic semiconductors, nonaqueous sol–gel process, shape–property relationships, vortex magnetism
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Advanced materials, Vol. 30, No. 1, 1703612, 20.01.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition
AU - Trepka, Bastian
AU - Erler, Philipp
AU - Selzer, Severin
AU - Kollek, Tom
AU - Boldt, Klaus
AU - Fonin, Mikhail
AU - Nowak, Ulrich
AU - Wolf, Daniel
AU - Lubk, Axel
AU - Polarz, Sebastian
N1 - Funding information: The research was funded by the Deutsche Forschungsgemeinschaft DFG within the framework of the collaborative research center SFB-1214 (project A5). K.B. acknowledges support from the Fonds der Chemischen Industrie through a Liebig Fellowship. A.L. and D.W. acknowledge funding from the European Research Council via the ERC-2016-STG starting grant ATOM. A.L. and D.W. further express their gratitude to R. Hübner (Helmholtz Zentrum Dresden-Rossendorf) for helping with recording the tilt series.
PY - 2018/1/20
Y1 - 2018/1/20
N2 - 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.
AB - 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.
KW - hollow nanostructures
KW - magnetic semiconductors
KW - nonaqueous sol–gel process
KW - shape–property relationships
KW - vortex magnetism
UR - http://www.scopus.com/inward/record.url?scp=85034265997&partnerID=8YFLogxK
U2 - 10.1002/adma.201703612
DO - 10.1002/adma.201703612
M3 - Article
VL - 30
JO - Advanced materials
JF - Advanced materials
SN - 0935-9648
IS - 1
M1 - 1703612
ER -