Abstract
A new development in small-angle neutron scattering with polarization analysis allows us to directly extract the average spatial distributions of magnetic moments and their correlations with three-dimensional directional sensitivity in any magnetic field. Applied to a collection of spherical magnetite nanoparticles 9.0 nm in diameter, this enhanced method reveals uniformly canted, magnetically active shells in a nominally saturating field of 1.2 T. The shell thickness depends on temperature, and it disappears altogether when the external field is removed, confirming that these canted nanoparticle shells are magnetic, rather than structural, in origin.
Repository Citation
Krycka, K.L., R.A. Booth, C.R. Hogg, et al. "Core-shell magnetic morphology of structurally uniform magnetite nanoparticles." Physical Review Letters 104: 207203.
Publisher
American Physical Society
Publication Date
5-21-2010
Publication Title
Physical Review Letters
Department
Physics and Astronomy
Document Type
Article
DOI
https://dx.doi.org/10.1103/PhysRevLett.104.207203
Keywords
Magnetic nanoparticles, Polarized neutron scattering
Document Version
published
Language
English
Format
text
