2D to 3D crossover of the magnetic properties in ordered arrays of iron oxide nanocrystals

[en] The magnetic 2D to 3D crossover behavior of well-ordered arrays of monodomain gamma-Fe2O3 spherical nanoparticles with different thicknesses has been investigated by magnetometry and Monte Carlo (MC) simulations. Using the structural information of the arrays obtained from grazing incidence small-angle X-ray scattering and scanning electron microscopy together with the experimentally determined values for the saturation magnetization and magnetic anisotropy of the nanoparticles, we show that MC simulations can reproduce the thickness-dependent magnetic behavior. The magnetic dipolar particle interactions induce a ferromagnetic coupling that increases in strength with decreasing thickness of the array. The 2D to 3D transition in the magnetic properties is mainly driven by a change in the orientation of the magnetic vortex states with increasing thickness, becoming more isotropic as the thickness of the array increases. Magnetic anisotropy prevents long-range ferromagnetic order from being established at low temperature and the nanoparticle magnetic moments instead freeze along directions defined by the distribution of easy magnetization directions.

Disciplines :

Materials science & engineering
Chemistry
Physics

Author, co-author :

Faure, Bertrand; Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Wetterskog, Erik; Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Gunnarsson, Klas; Uppsala Univ, Dept Engn Sci, Uppsala, Sweden.

Josten, Elisabeth; Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS, D-52425 Julich, Germany.

Hermann, Raphael ; Université de Liège - ULiège

Brueckel, Thomas; Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS, D-52425 Julich, Germany.

Andreasen, Jens Wenzel; Tech Univ Denmark, Dept Energy Convers & Storage, Roskilde, Denmark.

Meneau, Florian; Synchrotron SOLEIL, Beamline SWING, F-91191 Gif Sur Yvette, France.

Meyer, Mathias; Forschungszentrum Julich, Julich Ctr Neutron Sci JCNS 1, D-52425 Julich, Germany.

Lyubartsev, Alexander; Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

More authors (3 more)

Language :

English

Title :

2D to 3D crossover of the magnetic properties in ordered arrays of iron oxide nanocrystals

Publication date :

2013

Journal title :

Nanoscale

ISSN :

2040-3364

eISSN :

2040-3372

Publisher :

Royal Soc Chemistry, Cambridge, United Kingdom

Volume :

Issue :

Pages :

953-960

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

Sverige Vetenskapsrådet [SE]
KAW - Knut och Alice Wallenbergs Stiftelse [SE]

Commentary :

The authors would like to thank the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation (KAW) for financial support, the SOLEIL synchrotron for provision of beam time at SWING, the National Supercomputer Centre (Linkoping, Sweden) for providing computation resources, Doc. Jekabs Grins (Stockholm University) for performing the Rietveld refinement and Dr Ulrich Rucker for helpful discussions.

Available on ORBi :

since 17 February 2014

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