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Spin disorder in maghemite nanoparticles investigated using polarized neutrons and nuclear resonant scattering
DESY, FS PE, D-22607 Hamburg, Germany.;Forschungszentrum Julich, JCNS, JARA FIT, D-52425 Julich, Germany.;Forschungszentrum Julich, PGI, JARA FIT, D-52425 Julich, Germany.;Univ Liege, Fac Sci, B-4000 Liege, Belgium..
Univ Cologne, Dept Chem, D-50939 Cologne, Germany.;Inst Laue Langevin, F-38042 Grenoble, France..
DESY, FS PE, D-22607 Hamburg, Germany..
DESY, FS PE, D-22607 Hamburg, Germany..
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2016 (English)In: International Conference On Polarised Neutrons For Condensed Matter Investigations (PNCMI 2014), 2016Conference paper (Refereed)Text
Abstract [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 7.4nm 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.

Place, publisher, year, edition, pages
2016.
Series
, Journal of Physics Conference Series, ISSN 1742-6588 ; 711
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-299423ISI: 000376006000002OAI: oai:DiVA.org:uu-299423DiVA: diva2:949310
Conference
10th International Conference on Polarised Neutrons for Condensed Matter Investigations (PNCMI), SEP 15-19, 2014, Sydney, AUSTRALIA
Available from: 2016-07-18 Created: 2016-07-18 Last updated: 2016-07-22Bibliographically approved

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Wetterskog, Erik
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