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Correlated Spin Canting in Ordered Core-Shell Fe3O4/MnxFe3-xOd4^ Nanoparticle Assemblies
Published
Author(s)
Y. Ijiri, Kathryn L. Krycka, I. Hunt-Isaak, H. Pan, J. Hsieh, Julie Borchers, James Jennings Rhyne, Samuel D. Oberdick, A. Abdelgawad, S. A. Majetich
Abstract
Polarization-analyzed small-angle neutron scattering methods are used to determine the spin arrangements in ordered three-dimensional assemblies of 7.4 nm diameter core-shell Fe3O4/MnxFe3-xO4 nanoparticles. In moderate to high magnetic fields, the assemblies display a canted magnetic structure where the canting direction is coherent from nanoparticle to nanoparticle, in contrast to the less extended, more single particle-like behavior for similar ferrite assemblies. The observed magnetic scattering is modeled by assuming that the interparticle dipolar coupling combined with Zeeman energy effects in a field leads to nanoparticle domains with preferred net spin alignments relative to pre-existing packing symmetry axes. The model qualitatively explains the observed scattering anomalies which change significantly over a range of fields and temperatures, highlighting the possibly complex structures adopted in real, dense nanoparticle systems.
Ijiri, Y.
, Krycka, K.
, Hunt-Isaak, I.
, Pan, H.
, Hsieh, J.
, Borchers, J.
, Rhyne, J.
, Oberdick, S.
, Abdelgawad, A.
and Majetich, S.
(2019),
Correlated Spin Canting in Ordered Core-Shell Fe<sub>3</sub>O<sub>4</sub>/Mn<sub>x</sub>Fe<sub>3-x</sub>Od4^ Nanoparticle Assemblies, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926983
(Accessed October 10, 2025)