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Correlated Spin Canting in Ordered Core-Shell Fe3O4/MnxFe3-xOd4^ Nanoparticle Assemblies



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


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.
Physical Review B


Small Angle Neutron Scattering, Polarization analysis, Magnetic Nanoparticles, Dipole Interactions, Long-Range Magnetic Correlations


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], (Accessed June 14, 2024)


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Created March 17, 2019, Updated October 12, 2021