Anisotropy-driven magnetic structures in manganese ferrite nanoparticle assemblies
Abstract
Polarization-analyzed small-angle neutron scattering (PASANS) methods are used to determine the spin arrangements and experimental length scales of magnetic correlations in ordered three-dimensional assemblies of ∼7.6 nm diameter chemically homogeneous manganese ferrite nanoparticles. While the perpendicular magnetic scattering at remanence mostly follows single particle behavior at high temperature, the scattering deviates upon cooling the particles, growing maximally at intermediate temperatures (≈50–100 K) with intermediate field values also displaying canted magnetic structures. The data are fit with a sphere-based mass fractal model and are interpreted further via a micromagnetic simulation approach. The unusual temperature and field dependencies are explained in terms of a delicate balance between magnetic anisotropy and demagnetization. These results highlight the ability of PASANS to extract key features in nanoscale systems and the importance of correlating micromagnetic simulations.
Repository Citation
Y. Ijiri1,*, J. A. Borchers2, K. L. Krycka, et al. 2026. "Anisotropy-driven magnetic structures in manganese ferrite nanoparticle assemblies." Physical Review B 114(13): 134410.
Publisher
American Physical Society
Publication Date
9-8-2026
Publication Title
Physical Review B
Department
Physics and Astronomy
Document Type
Article
DOI
https://doi.org/10.1103/1mpl-2n6q
Keywords
Angle neutron-scattering, Spin
Language
English
Format
text
