Abstract

Polarization-analyzed small-angle neutron scattering methods are used to determine the spin morphology in high crystalline anisotropy, 11 nm diameter CoFe2O4 nanoparticle assemblies with randomly oriented easy axes. In moderate to high magnetic fields, the nanoparticles adopt a uniformly canted structure, rather than forming domains, shells, or other arrangements. The observed canting angles agree quantitatively with those predicted from an energy model dominated by Zeeman and anisotropy competition, with implications for the technological use of such nanoparticles.

Publisher

American Physical Society

Publication Date

11-1-2014

Publication Title

Physical Review B

Department

Physics and Astronomy

Document Type

Article

DOI

10.1103/PhysRevB.90.180405

Keywords

Neutron-scattering, Anisotropy, Magnetism, Spin

Document Version

published

Language

English

Format

text

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