Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange

Journal article
(Online publication)

Publication Details

Author(s): Sytnyk M, Kirchschlager R, Bodnarchuk MI, Primetzhofer D, Kriegner D, Enser H, Stangl J, Bauer P, Voith M, Hassel AW, Krumeich F, Ludwig F, Meingast A, Kothleitner G, Kovalenko MV, Heiß W
Journal: Nano Letters
Publisher: American Chemical Society
Publication year: 2013
Volume: 13
Journal issue: 2
Pages range: 586-593
ISSN: 1530-6984
Language: English


For three types of colloidal magnetic nanocrystals, we demonstrate that postsynthetic cation exchange enables tuning of the nanocrystal's magnetic properties and achieving characteristics not obtainable by conventional synthetic routes. While the cation exchange procedure, performed in solution phase approach, was restricted so far to chalcogenide based semiconductor nanocrystals, here ferrite-based nanocrystals were subjected to a Fe2+ to Co2+ cation exchange procedure. This allows tracing of the compositional modifications by systematic and detailed magnetic characterization. In homogeneous magnetite nanocrystals and in gold/magnetite core shell nanocrystals the cation exchange increases the coercivity field, the remanence magnetization, as well as the superparamagnetic blocking temperature. For core/shell nanoheterostructures a selective doping of either the shell or predominantly of the core with Co2+ is demonstrated. By applying the cation exchange to FeO/CoFe2O4 core/shell nanocrystals the Neel temperature of the core material is increased and exchange-bias effects are enhanced so that vertical shifts of the hysteresis loops are obtained which are superior to those in any other system.

FAU Authors / FAU Editors

Heiß, Wolfgang Prof. Dr.
Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)

External institutions with authors

Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich
Johannes Kepler Universität (JKU) Linz
Technische Universität Braunschweig
Technische Universität Graz
Uppsala University

How to cite

Sytnyk, M., Kirchschlager, R., Bodnarchuk, M.I., Primetzhofer, D., Kriegner, D., Enser, H.,... Heiß, W. (2013). Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange. Nano Letters, 13(2), 586-593. https://dx.doi.org/10.1021/nl304115r

Sytnyk, Mykhailo, et al. "Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange." Nano Letters 13.2 (2013): 586-593.


Last updated on 2018-08-08 at 05:23