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IOP Publishing, New Journal of Physics, 1(14), p. 013025, 2012

DOI: 10.1088/1367-2630/14/1/013025

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Quantitative spatial magnetization distribution in iron oxide nanocubes and nanospheres by polarized small-angle neutron scattering

Journal article published in 2012 by Sabrina Disch, Erik E. Wetterskog, Raphaël Pierre R. P. Hermann, Albrecht A. Wiedenmann, Ulla U. Vainio, Germàn G. Salazar-Alvarez, Lennart Magnus L. Bergstrom, Th T. Brückel ORCID, Th Brueckel, Th-H. Brückel
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 shapedependent surface spin canting with a 0.3(1) and 0.5(1) nm thick surface shell of reduced magnetization found for ∼9 nm nanospheres and ∼8.5nm 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. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. ; SCOPUS: ar.j ; info:eu-repo/semantics/published