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Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2013 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 13, no 2, 586-593 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 13, no 2, 586-593 p.
Keyword [en]
magnetic nanoctystals, cation exchange, exchange bias, nanoheterostructures, ferrites
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-197412DOI: 10.1021/nl304115rISI: 000315079500044OAI: oai:DiVA.org:uu-197412DiVA: diva2:613562
Available from: 2013-03-28 Created: 2013-03-25 Last updated: 2017-12-06Bibliographically approved

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Primetzhofer, Daniel

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