title: Core-shell magnetic morphology of structurally uniform magnetite nanoparticles.
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.
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Krycka
authors.forename: R A
authors.initials: RA
authors.lastname: Booth
authors.forename: C R
authors.initials: CR
authors.lastname: Hogg
authors.forename: Y
authors.initials: Y
authors.lastname: Ijiri
authors.forename: J A
authors.initials: JA
authors.lastname: Borchers
authors.forename: W C
authors.initials: WC
authors.lastname: Chen
authors.forename: S M
authors.initials: SM
authors.lastname: Watson
authors.forename: M
authors.initials: M
authors.lastname: Laver
authors.forename: T R
authors.initials: TR
authors.lastname: Gentile
authors.forename: L R
authors.initials: LR
authors.lastname: Dedon
authors.forename: S
authors.initials: S
authors.lastname: Harris
authors.forename: J J
authors.initials: JJ
authors.lastname: Rhyne
authors.forename: S A
authors.initials: SA
authors.lastname: Majetich
mesh_terms: D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D033363:Neutron Diffraction; D053838:Scattering, Small Angle; D013696:Temperature
chemical_list: D058185:Magnetite Nanoparticles