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Quantitative spatial magnetization distribution in iron oxide nanocubes and nanospheres by polarized small-angle neutron scattering
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2012 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 14, 013025- p.Article in journal (Refereed) Published
Abstract [en]

By means of polarized small-angle neutron scattering, we have resolved the long-standing challenge of determining the magnetization distribution in magnetic nanoparticles in absolute units. The reduced magnetization, localized in non-interacting nanoparticles, indicates strongly particle shape-dependent surface spin canting with a 0.3(1) and 0.5(1) nm thick surface shell of reduced magnetization found for similar to 9 nm nanospheres and similar to 8.5 nm nanocubes, respectively. Further, the reduced macroscopic magnetization in nanoparticles results not only from surface spin canting, but also from drastically reduced magnetization inside the uniformly magnetized core as compared to the bulk material. Our microscopic results explain the low macroscopic magnetization commonly found in nanoparticles.

Place, publisher, year, edition, pages
2012. Vol. 14, 013025- p.
National Category
Materials Chemistry
Research subject
Materials Chemistry
URN: urn:nbn:se:su:diva-67992DOI: 10.1088/1367-2630/14/1/013025ISI: 000300412700002OAI: diva2:471514
Available from: 2012-01-02 Created: 2012-01-02 Last updated: 2013-09-17Bibliographically approved

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Wetterskog, ErikSalazar-Alvarez, GermanBergström, Lennart
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Department of Materials and Environmental Chemistry (MMK)
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