[en] The manuscript reports the investigation of spin disorder in maghemite nanoparticles of different shape by a combination of polarized small-angle neutron scattering (SANSPOL) and nuclear forward scattering (NFS) techniques. Both methods are sensitive to magnetization on the nanoscale. SANSPOL allows for investigation of the particle morphology and spatial magnetization distribution and NFS extends this nanoscale information to the atomic scale, namely the orientation of the hyperfine field experienced by the iron nuclei. The studied nanospheres and nanocubes with diameters of 7.4 nm and 10.6 nm, respectively, exhibit a significant spin disorder. This effect leads to a reduction of the magnetization to 44% and 58% of the theoretical maghemite bulk value, observed consistently by both techniques.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Herlitschke, Marcus ; FS-PE, Deutsches Elektronen-Synchrotron, Hamburg, Germany, JCNS and PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany, Faculté des Sciences, Université de Liége, Liége, Belgium
Disch, S.; Department Chemie, Universität zu Köln, Köln, Germany, Institut Laue-Langevin, Grenoble, France
Wetterskog, E.; Department of Engineering Sciences, Angström Laboratory, Uppsala, Sweden
Bergström, L.; Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
Hermann, Raphaël ; Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Lee, W. T. H.
McIntyre, G.
Rule, K.
Language :
English
Title :
Spin disorder in maghemite nanoparticles investigated using polarized neutrons and nuclear resonant scattering
Publication date :
2016
Event name :
10th International Conference on Polarised Neutrons for Condensed Matter Investigations, PNCMI 2014
Event date :
15 September 2014 through 19 September 2014
Audience :
International
Journal title :
Journal of Physics. Conference Series
ISSN :
1742-6588
eISSN :
1742-6596
Publisher :
Institute of Physics Publishing
Volume :
711
Issue :
1
Pages :
012002
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
7th European Community Framework Programme (PIEFGA- 2011-298918); VH NG-407 \Lattice dynamics in emerging functional materials"
Funders :
UE - Union Européenne Fonds der Chemischen Industrie HGF - Helmholtz-Gemeinschaft Deutscher Forschungszentren DOE - United States. Department of Energy Sverige Vetenskapsrådet
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