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Wednesday, 18 December 2013

New magnetic phenomena in core/shell nanoparticles paves the way for smaller magnetic devices

Antiferromagnetic coupling between core and shell in core/shell nanoparticles is reported for the first time in iron oxide – manganese oxide based nanoparticles.

Antiferromagnetic coupling between magnetic layers is a key ingredient in many magnetic devices. This coupling has been reproduced for the first time in nanoparticles. Iron oxide particles surrounded by a very thin layer of manganese oxide and the reverse combination, manganese oxide particles coated with a layer of iron oxide, have been used to demonstrate the effect. The discovery provides unprecedented control of the behavior of magnetic nanoparticles, allowing easy tuning of their properties. The feasibility to establish antiferromagnetic couplings in core/shell nanoparticles lays the first stone for more advanced application of core/shell nanoparticles.

The work has been published in Nature Communications under the title "Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles" by ICREA Research Professor Josep Nogués (ICN2), Prof. Dolors Baró and Santiago Surinach (Universitat Autonoma de Barcelona), as well as other researchers from several centers: Universitat de Barcelona, Universidad Complutense de Madrid, Universita degli Studi di Firenze, St. Petersburg Nuclear Physics Institute, Stockholm University, National Centre for Scientific Research "Demokritos", l’Oak Ridge National Laboratory, Miami University and Argonne National Laboratory.

For more information, please contact:

ICREA Research Professor Josep Nogués

Head of the Magnetic Nanostructures Group

Tel: +34 937 371 604

E-mail: josep.nogues@icn.cat

Link to the Nature Communications article: Robust antiferromagnetic coupling in hard-soft bi-magnetic core/shell nanoparticles