Journal Article

PreJuSER-19989

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quantitative spatial magnetization distribution in iron oxide nanocubes and nanospheres by polarized small-angle neutron scattering

Disch, S.FZJ* ; Wetterskog, E. ; Hermann, R.FZJ* ; Wiedenmann, A. ; Vainio, U. ; Salazar-Alvarez, G. ; Bergström, L. ; Brückel, T.FZJ*

2012
Dt. Physikalische Ges. [Bad Honnef]

This record in other databases:  

Please use a persistent id in citations: http://hdl.handle.net/2128/7412  doi:10.1088/1367-2630/14/1/013025

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 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.

Keyword(s): J

Note: We acknowledge the ILL, HASYLAB/DESY and APS for the provision of neutron and synchrotron beamtime at D22, B1 and 6-ID-D, respectively, and the German National Academic Foundation for financial support (to SD).

---

Contributing Institute(s):

1. Streumethoden (PGI-4)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
3. Streumethoden (JCNS-2)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2012

---

Database coverage:
; ; ; ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---