Field-Driven Self-Assembly of Magnetite Nanoparticles Investigated Using   Small-Angle Neutron Scattering
  The magnetic-field-induced assembly of magnetic nanoparticles (NPs) provides a unique and flexible strategy in the design and the fabrication of functional nanostructures and devices. We have investigated the field-driven self-assembly of core-shell magnetite NPs dispersed in toluene by means of in situ small angle neutron scattering (SANS). The form factor of the core-shell NPs was characterized and analyzed using SANS with polarized neutrons. Large-scale aggregation of magnetite NPs has formed above 0.02 T as indicated by very-small angle neutron scattering measurements. Three-dimensional long-range ordered superlattice of magnetite NPs was revealed under the application of moderate magnetic field. The crystal structure of the superlattice has been identified as a face-centered cubic one. 
Zhendong Fu, Yinguo Xiao, Artem Feoktystov, Vitaliy Pipich,   Marie-Sousai Appavou, Yixi Su, Erxi Feng, W. T. Jin, Thomas Br...
cond-mat.mes-hall